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Mitsubishi Electric MELSEC FX2N-2LC User Manual

Temperature control block
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USER'S MANUAL
FX
-2LC Temperature Control Block
2N

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Summary of Contents for Mitsubishi Electric MELSEC FX2N-2LC

  • Page 1 USER’S MANUAL -2LC Temperature Control Block...
  • Page 2 FX2N-2LC Temperature Control Block Foreword • This manual contains text, diagrams and explanations which will guide the reader in the cor- rect installation and operation of the communication facilities of FX series. • Before attempting to install or use the communication facilities of FX series this manual should be read and understood.
  • Page 3 FX2N-2LC Tempereture Control Block -2LC Temperature Control Block USER’S MANUAL Manual number : JY992D85801 Manual revision : A Date : January 2000...
  • Page 4 FX2N-2LC Tempereture Control Block...
  • Page 5 Mitsubishi users are always welcomed. This page has been designed for you,the reader,to fill in your comments and fax them back to us. We look forward to hearing from you. Fax numbers: Your name ............ Mitsubishi Electric................. America (01) 847-478-2253 Your company ..........
  • Page 6 FX2N-2LC Tempereture Control Block...
  • Page 7 FX2N-2LC Tempereture Control Block Guidelines for the Safety of the User and Protection of the Temperature control block FX -2LC. This manual provides information for the use of the Temperature control block FX -2LC. The manual has been written to be used by trained and competent personnel. The definition of such a person or persons is as follows;...
  • Page 8 • All examples and diagrams shown in this manual are intended only as an aid to understand- ing the text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for actual use of the product based on these illustrative examples.

  • Page 9: Table Of Contents

    Contents FX2N-2LC Temperature Control Block 1. Introduction ................... 1-1 1.1 Outline of product ....................1-2 2. Product Configuration ................2-1 2.1 Outside dimension....................2-1 2.2 Name of each part ....................2-1 2.3 Status indication ....................2-2 2.4 Installation method ....................2-3 2.5 Connection to PC Main Unit ................
  • Page 10 Contents FX2N-2LC Temperature Control Block 7.2.10 BFM #13 to BFM #16 (CH1) and BFM #22 to BFM #25 (CH2): Alarm 1/2/3/4 set value....................7-8 7.2.11 BFM #17 (CH1) and BFM #26 (CH2): Heater disconnection alarm set value ... 7-8 7.2.12 BFM #18 (CH1) and BFM #27 (CH2) : Auto/manual mode changeover ....7-8 7.2.13 BFM #19 (CH1) and BFM #28 (CH2): Manual output set value ........

  • Page 11: Introduction

    Introduction 1 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 12 Introduction 1 FX2N-2LC Temperature Control Block...
  • Page 13 FX2N-2LC Temperature Control Block Introduction 1 Introduction Cautions on design • Install a safety circuit outside the PLC or the temperature control block FX -2LC so that the entire system conservatively operates even if an abnormality occurs in the external power supply or a failure occurs in the PLC or the FX -2LC.

  • Page 14: Outline Of Product

    FX2N-2LC Temperature Control Block Introduction 1 Outline of product The temperature control block FX -2LC (hereafter referred to as "temperature control block" or "FX -2LC") equipped with two temperature input points and two transistor (open collector) output points is a special block to read temperature signals from thermocouples and platinum resistance thermometer bulbs, and perform PID output control.

  • Page 15: Product Configuration

    Product Configuration 2 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 16 Product Configuration 2 FX2N-2LC Temperature Control Block...

  • Page 17: Outside Dimension

    FX2N-2LC Temperature Control Block Product Configuration 2 Product Configuration Outside dimension Connector for next step extension cable Extension cable DIN rail (width: POWER 35 mm) mounting groove -2LC Mounting OUT1 hole OUT2 2-φ45 DIN rail Status indicator LED Unit: mm Mass: kg Outer color: Munsell 0.08GY / 7.64 / 0.81 Name of each part...

  • Page 18: Status Indication

    FX2N-2LC Temperature Control Block Product Configuration 2 Status indication Table 2.1: LED name Indication Description Lit (green) 5 V power is supplied from PC main unit. POWER Extinguished 5 V power is not supplied from PC main unit. Lit (red) 24 V power is supplied from outside.

  • Page 19: Installation Method

    FX2N-2LC Temperature Control Block Product Configuration 2 Installation method The FX -2LC can be installed on the right side of an FX Series PLC basic unit, FX Series extension unit or another extension block. The FX -2LC can be attached with a DIN rail DIN46277 (width: 35 mm) or directly attached to a panel surface with screws (M4).

  • Page 20: Connection To Pc Main Unit

    FX2N-2LC Temperature Control Block Product Configuration 2 Connection to PC Main Unit Connect the FX -2LC to the PC main unit with an extension cable. -2LC units are treated as special blocks of the PLC, and the special block No. 0 to 7 is automatically assigned to each FX -2LC unit from the one nearest to the PLC basic unit.

  • Page 21: Specifications

    Specifications 3 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 22 Specifications 3 FX2N-2LC Temperature Control Block...

  • Page 23: Environmental Specifications

    FX2N-2LC Temperature Control Block Specifications 3 Specifications Environmental specifications Table 3.1: Item Specifications 500 VAC for 1 minute (between analog input terminal and grounding ter- Withstand voltage minal) Other environmental specifications are equivalent to those for the PC main unit. (Refer to the manual of the PC main unit.) Power supply specifications Table 3.2:...

  • Page 24: Performance Specifications

    FX2N-2LC Temperature Control Block Specifications 3 Performance specifications Table 3.3: Item Description Two-position control, PID control (with auto tuning function), PI Control method control Control operation period 500 ms Set temperature range Equivalent to input range (Refer to 7.2.33) Alarm is detected in accordance with setting of buffer memory. Heater disconnection detection (Variable within range from 0.0 to 100.0 A.).

  • Page 25: Input Specifications

    FX2N-2LC Temperature Control Block Specifications 3 Input specifications Table 3.4: Item Description Number of input points 2 points Thermocou- K, J, R, S, E, T, B, N, PLII, WRe5=26, U, L Input type Resistance thermome- Pt100, JPt100 ter bulb ± 0.7 % of range span ± 1 digit (±...

  • Page 26: Input Range

    FX2N-2LC Temperature Control Block Specifications 3 Input range Table 3.5: Sensor type -200.0 to 200.0 °C -200.0 to 200.0 °C -100.0 to 400.0 °C -100.0 to 400.0 °C -100.0 to 800.0 °C 0 to 1700 °C 0 to 1700 °C Input range -100 to 1300 °C -100 to 1200 °C...

  • Page 27: Output Specifications

    FX2N-2LC Temperature Control Block Specifications 3 Output specifications Table 3.6: Item Description Number of output points 2 points Output method NPN open collector transistor output Rated load voltage 5 to 24 VDC Maximum load voltage 30 VDC or less Maximum load current 100 mA Leak current in OFF status 0.1 mA or less...
  • Page 28 FX2N-2LC Temperature Control Block Specifications 3...

  • Page 29: Wiring

    Wiring 4 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 30 Wiring 4 FX2N-2LC Temperature Control Block...
  • Page 31 FX2N-2LC Temperature Control Block Wiring 4 Wiring Cautions on Wiring • Make sure to shut down the power supplies of all phases on the outside before starting installation or wiring. If the power supplies are not shut down, you may get electrical shock or the unit may be damaged.
  • Page 32 FX2N-2LC Temperature Control Block Wiring 4 Wiring When a temperature sensor is a thermocouple (TC) AC power supply DC24V -2LC OUT1 OUT2 PTA / • Shielded cable Heater PTB / TC+ Thermocouple PTB / TC- PTA / • Shielded cable Heater PTB / TC+ Thermocouple...

  • Page 33: Wiring

    Introduction of Functions 5 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 34 Introduction of Functions 5 FX2N-2LC Temperature Control Block...

  • Page 35: Pid Control

    FX2N-2LC Temperature Control Block Introduction of Functions 5 Introduction of Functions This section introduces the functions of the FX -2LC. For setting of each function, refer to the description on buffer memories (BFM) later. PID control 5.1.1 Easy PID control with two degrees of freedom PID control is a control method to obtain stable control result by setting each of the constants "P (proportional band)", "I (integral time)"...

  • Page 36: Overshoot Prevention Function

    FX2N-2LC Temperature Control Block Introduction of Functions 5 5.1.2 Overshoot prevention function Generally in PID control, when a deviation continues for a long time, the PID arithmetic opera- tion result exceeds the effective range (from 0 to 100%) of the operation quantity. At this time, even if the deviation becomes smaller, it takes some time until the output comes within the effective range because of the integral operation.

  • Page 37: Two-Position Control

    FX2N-2LC Temperature Control Block Introduction of Functions 5 Two-position control When the proportional band (P) value is set to "0.0", the FX -2LC performs two-position con- trol. In two-position control, the control output (MV) is set to ON when the measured value (PV) is larger than the temperature set value (SV) or OFF when the measured value (PV) is smaller than the temperature set value (SV).

  • Page 38: Auto Tuning Function

    FX2N-2LC Temperature Control Block Introduction of Functions 5 Auto tuning function 5.3.1 AT (auto tuning) The AT (auto tuning) function automatically measures, calculates and sets optimal PID con- stants in accordance with the set temperature. When the AT execution command (CH1: BFM #20, CH2: BFM #29) is set to "1", auto tuning is performed.

  • Page 39: At Bias

    FX2N-2LC Temperature Control Block Introduction of Functions 5 2) When either of the following conditions are given during auto tuning, the operation is aborted. - When the input value (PV) becomes abnormal caused by disconnection, etc. - When the set value (SV) is changed - When control is stopped, when the operation mode is changed or when the auto/manual mode is set to "manual"...

  • Page 40: Auto / Manual

    FX2N-2LC Temperature Control Block Introduction of Functions 5 Auto / manual 5.4.1 Auto mode and manual mode The mode can be changed over between "auto" and "manual". In the auto mode, the control output value (MV) is set to the output quantity automatically calculated in accordance with the temperature set value (SV).

  • Page 41: Balance-Less, Bump-Less Function

    FX2N-2LC Temperature Control Block Introduction of Functions 5 5.4.2 Balance-less, bump-less function The balance-less, bump-less function prevents overload caused by drastic change in the con- trol output value (MV) when the mode is changed over from auto to manual (or from manual to auto).

  • Page 42: Heater Disconnection Detection Function

    FX2N-2LC Temperature Control Block Introduction of Functions 5 Heater disconnection detection function The heater disconnection detection function detects the current flowing in the load using a cur- rent detector (CT), it compares the detected value (heater current measured value) with the current value set for heater disconnection alarm, and issues an alarm when the measured value is more than or less than the current set value for the heater disconnection alarm.

  • Page 43: Loop Breaking Alarm Function (Lba)

    FX2N-2LC Temperature Control Block Introduction of Functions 5 Loop breaking alarm function (LBA) The loop breaking alarm function starts to detect the variation of the measured value (PV), at every loop breaking alarm judgment time when the output becomes more than 100% (or the output limiter upper limit) or less than 0% (or the output limiter lower limit), then sets to ON the loop breaking alarm (CH1: BFM #1 b8, CH2: BFM #2 b8) when judging that there is an abnor- mality in the control loop.
  • Page 44 FX2N-2LC Temperature Control Block Introduction of Functions 5 5-10...

  • Page 45: Alarm

    Alarm 6 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 46 Alarm 6 FX2N-2LC Temperature Control Block...
  • Page 47 FX2N-2LC Temperature Control Block Alarm 6 Alarm The FX -2LC is equipped with 14 types of alarms. Among them, up to 4 types can be used in accordance with the application. The alarm types to be used can be selected using buffer memories. The result of each alarm is written to BFM #1 and BFM #2, and can be read in the PLC main unit.
  • Page 48 FX2N-2LC Temperature Control Block Alarm 6 Table 6.1: Alarm Alarm type Description range When deviation (= Measured value (PV) - Set value (SV)) is more than alarm set value, an alarm Upper limit deviation value ±Input is issued. However, when power is turned on and alarm with re-wait width when set value is changed, measured value is...
  • Page 49 FX2N-2LC Temperature Control Block Alarm 6 Upper limit input value alarm When the measured value (PV) is more than the alarm set value, an alarm is issued. Measured value (PV) Measured value (PV) Alarm set value Time Non-alarm status Alarm status Alarm status Lower limit input value alarm When the measured value (PV) is less than the alarm set value, an alarm is issued.
  • Page 50 FX2N-2LC Temperature Control Block Alarm 6 Lower limit deviation alarm When the deviation (= Measured value (PV) - Set value (SV)) is less than the alarm set value, an alarm is issued. < When the deviation is positive > < When the deviation is negative > Measured value Measured value Measured value...
  • Page 51 FX2N-2LC Temperature Control Block Alarm 6 Alarm wait operation The wait operation ignores the alarm status of the measured value (PV) occurred when the power is turned on, and disables the alarm function until the measured value (PV) goes out of the alarm status once.
  • Page 52 FX2N-2LC Temperature Control Block Alarm 6...
  • Page 53 Buffer Memory (BFM) 7 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 54 Buffer Memory (BFM) 7 FX2N-2LC Temperature Control Block...

  • Page 55: Buffer Memory List

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 Buffer Memory (BFM) Each setting and alarm in the FX -2LC is written from or read to the PLC main unit through buffer memories (hereafter referred to as "BFM"). Each BFM consists of 16 bits. Use FROM/TO instructions in the 16-bit format. Buffer memory list Table 7.1: BFM No.
  • Page 56 FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 Table 7.1: BFM No. Initial Name Description/set range Remarks value CH1 CH2 #55 Control response parameter 0: Slow 1: Medium 2: Fast Output limiter lower limit to 105.0 #56 Output limiter upper limit 100.0 #57 Output limiter lower limit -5.0% to output limiter upper limit...
  • Page 57 FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 Table 7.1: BFM No. Initial Name Description/set range Remarks value CH1 CH2 0: Monitors both ON current and CT monitor method changeover OFF current. 0 R/W 1: Monitors only ON current. 0: Normal Set value range error address 1 or another numeric value : Set- ting error address...

  • Page 58: Details Of Buffer Memories

    Turns on when an error has been caused by noise or when a failure has occurred in FX -2LC. Set value backup error If contents of error are not eliminated even after power is turned off once then on again, contact Mitsubishi Electric System Service. Not used Not used Not used...

  • Page 59: Bfm #1 (Ch1) And Bfm #2 (Ch2): Event

    FX -2LC. If contents of error are not eliminated even after power is turned off once then on again, contact Mitsubishi Electric A/D converted value error System Service. Alarm 1 Turns on when an alarm has occurred.
  • Page 60 FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 Operation of b15 (temperature rise completed status) Example 1: When the soak time is set to "0" Set value (SV) Temperature rise completion range Temperature rise completed Example 2: When the soak time is set to any positive value Set value (SV) Temperature rise Soak...

  • Page 61: Bfm #3 (Ch1) And Bfm #4 (Ch2): Measured Value (Pv)

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.3 BFM #3 (CH1) and BFM #4 (CH2): Measured value (PV) BFM #3 stores the measured value of CH1. BFM #4 stores the measured value of CH2. ° ° ° ° The unit is C, 0.1 F or 0.1 F in accordance with the setting of the input type selection...

  • Page 62: Bfm #12 (Ch1) And Bfm #21 (Ch2) : Set Value (Sv)

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.9 BFM #12 (CH1) and BFM #21 (CH2) : Set value (SV) BFM #12 stores the set value of CH1. BFM #21 stores the set value of CH2. ° ° ° ° The unit is C, 0.1 F or 0.1...

  • Page 63: Bfm #19 (Ch1) And Bfm #28 (Ch2): Manual Output Set Value

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.13 BFM #19 (CH1) and BFM #28 (CH2): Manual output set value In BFM #19 (CH1) and BFM #28 (CH2), set the output ON ratio in the manual mode. The display range is from -5.0 to +105.0%. The output ON/OFF cycle (period of time) can be set within the range from 1 to 100 sec using BFM #42 (CH1) and BFM #61 (CH2).

  • Page 64: Bfm #34 (Ch1) And Bfm #53 (Ch2): Integral Time (I)

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.18 BFM #34 (CH1) and BFM #53 (CH2): Integral time (I) In BFM #34, set the integral time of CH1. In BFM #53, set the integral time of CH2. The integral operation changes the operation quantity in proportion to the area enclosed by the deviation size and the period of time in which deviation is generated.

  • Page 65: Bfm #36 (Ch1) And Bfm #55 (Ch2): Control Response Parameter

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.20 BFM #36 (CH1) and BFM #55 (CH2): Control response parameter In BFM #36, set the control response parameter of CH1. In BFM #55, set the control response parameter of CH2. The control response parameter selects the response to changes in the temperature set value (SV) in PID control among three steps (slow, medium and fast).

  • Page 66: Bfm #37 (Ch1) And Bfm #56 (Ch2): Output Limiter Upper Limit Bfm #38 (Ch1) And Bfm #57 (Ch2): Output Limiter Lower Limit

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.21 BFM #37 (CH1) and BFM #56 (CH2): Output limiter upper limit BFM #38 (CH1) and BFM #57 (CH2): Output limiter lower limit In BFM #37 and BFM #56, set the output limiter upper limit of CH1 and CH2 respectively. In BFM #38 and BFM #57, set the output limiter lower limit of CH1 and CH2 respectively.

  • Page 67: Bfm #39 (Ch1) And Bfm #58 (Ch2): Output Change Ratio Limiter

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.22 BFM #39 (CH1) and BFM #58 (CH2): Output change ratio limiter In BFM #39, set the output change ratio limiter of CH1. In BFM #58, set the output change ratio limiter of CH2. The output change ratio limiter function limits the variation of the control output value (MV) per unit time (1 sec).

  • Page 68: Bfm #40 (Ch1) And Bfm #59 (Ch2): Sensor Correction Value Setting (Pv Bias)

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.23 BFM #40 (CH1) and BFM #59 (CH2): Sensor correction value setting (PV bias) In BFM #40, set the sensor correction value of CH1. In BFM #59, set the sensor correction value of CH2. The actual input value is added (corrected) by the sensor correction value, then stored as the measured value (BFM #3, BFM #4).

  • Page 69: Bfm #41 (Ch1) And Bfm #60 (Ch2): Adjustment Sensitivity (Dead Zone) Setting

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.24 BFM #41 (CH1) and BFM #60 (CH2): Adjustment sensitivity (dead zone) setting In BFM #41, set the adjustment sensitivity (dead zone) of CH1. In BFM #60, set the adjust- ment sensitivity (dead zone) of CH2. By setting the adjustment sensitivity, repetitious turning on/off of the output around the temper- ature set value (SV) can be prevented while two-position control is performed.

  • Page 70: Bfm #43 (Ch1) And Bfm #62 (Ch2): Primary Delay Digital Filter Setting

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.26 BFM #43 (CH1) and BFM #62 (CH2): Primary delay digital filter setting In BFM #43, set the primary delay digital filter of CH1. In BFM #62, set the primary delay digi- tal filter of CH2.

  • Page 71: Bfm #44 (Ch1) And Bfm #63 (Ch2): Setting Change Ratio Limiter

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.27 BFM #44 (CH1) and BFM #63 (CH2): Setting change ratio limiter In BFM #44, set the setting change ratio limiter of CH1. In BFM #63, set the setting change ratio limiter of CH2. The setting change ratio limiter function changes step by step the difference in the temperature set value when the temperature set value is changed.

  • Page 72: Bfm #45 (Ch1) And Bfm #64 (Ch2): At (Auto Tuning) Bias

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.28 BFM #45 (CH1) and BFM #64 (CH2): AT (auto tuning) bias In BFM #45, set the AT (auto tuning) bias of CH1. In BFM #64, set the AT (auto tuning) bias of CH2.
  • Page 73 FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.30 BFM #47 (CH1) and BFM #66 (CH2): Setting the upper limit BFM #48 (CH1) and BFM #67 (CH2): Setting the lower limit In BFM #47 and BFM #66, enter the upper range limit of CH1 and CH2 respectively. In BFM #48 and BFM #67, enter the lower range limit of CH1 and CH2 respectively.

  • Page 74: Bfm #49 (Ch1) And Bfm #68 (Ch2): Loop Breaking Alarm Judgement Time

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.31 BFM #49 (CH1) and BFM #68 (CH2): Loop breaking alarm judgement time In BFM #49, set the loop breaking alarm judgement time of CH1. In BFM #68, set the loop breaking alarm judgement time of CH2. The loop breaking alarm function starts to detect the variation of the measured value (PV) at every loop breaking alarm judgment time when the output becomes more than 100% (or the output limiter upper limit) or less than 0% (or the output limiter lower limit), then sets to ON the...

  • Page 75: In Bfm #50, Set The Loop Breaking Alarm Dead Zone Of Ch1

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.32 In BFM #50, set the loop breaking alarm dead zone of CH1. In BFM #69, set the loop breaking alarm dead zone of CH2. The loop breaking alarm function may issue alarms caused by disturbances (effect of another heat source, etc.) even if there is no abnormality in the control system.

  • Page 76: Bfm #70 (Ch1) And Bfm #71 (Ch2): Input Type Selection

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.33 BFM #70 (CH1) and BFM #71 (CH2): Input type selection In BFM #70, select the input type of CH1. In BFM #71, select the input type of CH2. The initial value is "2". Table 7.7: Sensor Sensor...

  • Page 77: Bfm #72 To Bfm #75: Alarm Mode Setting

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.34 BFM #72 to BFM #75: Alarm mode setting The FX -2LC is equipped with 14 types of alarms. Among them, up to 4 types can be used in accordance with the application. Write the alarm No.
  • Page 78 FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 Table 7.8: Alarm Alarm type Description range When absolute deviation (=  Measured value (PV) - Set value (SV)  ) is more than alarm set value, an Upper/lower limit deviation +Input value alarm with wait alarm is issued.

  • Page 79: Bfm #76: Alarm 1/2/3/4 Dead Zone Setting

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.35 BFM #76: Alarm 1/2/3/4 dead zone setting In BFM #76, set the dead zone of alarms 1 to 4. This setting is applied to all of alarms 1 to 4. When the measured value (PV) is near the alarm set value, the alarm status and the non- alarm status may be repeated by fluctuation in inputs.

  • Page 80: Bfm #77: Number Of Times Of Alarm 1/2/3/4 Delay

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.36 BFM #77: Number of times of alarm 1/2/3/4 delay In BFM #77, set the number of alarm delays. This setting is applied to all alarms 1 to 4. The alarm delay function keeps the non-alarm status until the number of input samples exceeds the number of alarm delays, after the deviation between the measured value (PV) and the set value (SV) reaches the alarm set value.

  • Page 81: Bfm #79: Temperature Rise Completion Range Setting

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.38 BFM #79: Temperature rise completion range setting In BFM #79, set the temperature rise completion range. This setting is applied to both CH1 and CH2. Set the temperature range in which the temperature rise completion range is judged based on the temperature set value.

  • Page 82: Bfm #81: Ct Monitor Method Changeover

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.40 BFM #81: CT monitor method changeover In BFM #81, change over the CT monitor method. This setting is applied to both CH1 and CH2. The current is detected by sampling performed every second. While the temperature is controlled, the control output repeatedly turns on and off.

  • Page 83: Bfm #83: Set Value Backup Command

    FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7.2.42 BFM #83: Set value backup command BFM #83 writes the values set to BFM #12 to BFM #29 and BFM #32 to BFM #81 to the EEPROM built in the FX -2LC.
  • Page 84 FX2N-2LC Temperature Control Block Buffer Memory (BFM) 7 7-30...

  • Page 85: Program Example

    Program Example 8 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 86 Program Example 8 FX2N-2LC Temperature Control Block...
  • Page 87 • Never disassemble or modify the unit. Disassembly or modification may cause failure, malfunction or fire. * For repair, contact Mitsubishi Electric System Service. • Turn off the power before connecting or disconnecting a connection cable such as exten- sion cable.
  • Page 88 FX2N-2LC Temperature Control Block Program Example 8 Program example This paragraph introduces an example of program to operate the FX -2LC. Condition : Model K -- 100.0 to 400.0 °C Input range PID values : Set by auto tuning Alarm : Upper limit deviation alarm with re-wait and lower limit deviation alarm with re- wait Alarm dead zone...
  • Page 89 FX2N-2LC Temperature Control Block Program Example 8 Data registers D0 , D1:Set values D2: Not used D3: Temperature measured value (PV) of CH1 D4: Temperature measured value (PV) of CH2 D5: Control output value (MV) of CH1 D6: Control output value (MV) of CH2 D7: Heater current measured value of CH1 D8: Heater current measured value of CH2 D82: Set value range error address...
  • Page 90 FX2N-2LC Temperature Control Block Program Example 8 PLC program M8002 K1000 Sets "100.0 °C" as the set value. K1000 M8000 K 12 Writes the set values. While the PLC is running, the set values can be changed using D0 and D1. K 21 K 13 K 30...
  • Page 91 FX2N-2LC Temperature Control Block Program Example 8 K 70 Temperat Input type selection: Type K (-100.0 to +400.0 °C) for both channels control K 71 ready flag Alarm mode setting: K 72 K 12 Upper limit deviation alarm with re-wait Alarm mode setting: K 73 K 13...
  • Page 92 FX2N-2LC Temperature Control Block Program Example 8 X000 Initializes all data. Disables When X000 is set to ON, all data is initialized. initialization. (When initialization is not necessary, this line can X000 be omitted.) Performs initialization. X001 K 10 Disables error Error reset command reset.
  • Page 93 FX2N-2LC Temperature Control Block Program Example 8 • In this example, the status of the flags (BFM #0) and the events (BFM #1 and BFM #2) can be monitored using auxiliary relays (M). In order to output such status to the outside, use each auxiliary relay as a contact and drive outputs (Y).
  • Page 94 FX2N-2LC Temperature Control Block Program Example 8...

  • Page 95: Program Example

    Troubleshooting 9 FX2N-2LC Temperature Control Block Introduction Product Configuration Specifications Wiring Introduction of Functions Alarm Buffer Memory (BFM) Program Example Diagnostic...
  • Page 96 Troubleshooting 9 FX2N-2LC Temperature Control Block...

  • Page 97: Diagnostic

    Turns on when an error has been caused by noise or when a fail- ure has occurred in FX -2LC. Set value backup error If contents of error are not eliminated even after power is turned off once then on again, contact Mitsubishi Electric System Ser- vice. · · · · · ·...
  • Page 98 FX2N-2LC Temperature Control Block Diagnostic 9 Other causes of errors In addition to the flags and the events, the following situation may be realized. 1) The FX -2LC does not operate with the set values written by TO instructions. - Check whether or not the FX -2LC is correctly connected to the PLC.
  • Page 99 Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential damage that may arise as a result of the installation, use and/or programming of the products associated with this manual. All examples and diagrams shown in this manual are intended as an aid to understanding the text, not to guarantee operation.
  • Page 100 USER’S MANUAL -2LC Temperature Control Block HEAD OFFICE: MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100-8310 TELEX: J24532 CABLE MELCO TOKYO HIMEJI WORKS: 840, CHIYODA CHO, HIMEJI, JAPAN Effective Jan. 2000 Specification are subject JY992D85801A to change without notice. (MEE0001)

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