Mitsubishi Electric MELSEC iQ-R Series User Manual page 232

CH1 Alert definition
Bits corresponding to alerts detected become 1.
b15 b14 b13 b12 b11 b10 b9
0
Fixed to 0
Bit No.
b0
b1
b2, b3
b4
b5
b6, b7
b8
b9
b10
b11
b12
b13
b14
b15
*1 The range between the input range lower limit value - 5% and the input range upper limit value + 5% for the full scale of the input range
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory area name
CH Alert definition
CH Alert definition (in the Q compatible mode)
■Temperature measuring range
The following shows a calculation example of the temperature measuring range.
Ex.
Calculation example: When 'CH1 Input range' (Un\G501) is 38
• (Input range lower limit value) - (5% of full scale) = -200 - ((400.0 - (-200.0))  0.05) = -230.0
• (Input range upper limit value) + (5% of full scale) = 400 + ((400.0 - (-200.0))  0.05) = 430.0
Therefore, the temperature measuring range is -230.0 to 430.0.
The temperature control module checks whether an input temperature is within the temperature measuring range of the input
range. When the input temperature is out of the temperature measuring range, CH1 Input range upper limit (Un\G401, b0) or
CH1 Input range lower limit (Un\G401, b1) becomes 1 (ON). The conditions that the temperature control module uses to judge
whether the measured temperature is within the temperature measuring range or not differ depending on the following
settings:
• 'Setting/operation mode command' (Y1) ( Page 164 Setting/operation mode command)
• 'PID continuation flag' (Un\G306) ( Page 226 PID continuation flag)
• 'CH1 PID control forced stop command' (YC) ( Page 166 PID control forced stop command)
• 'CH1 Stop mode setting' (Un\G503) ( Page 260 CH1 Stop mode setting)
APPX
230
Appendix 3 Buffer Memory Areas
b8 b7 b6 b5 b4
0 0
Fixed to 0 Fixed to 0
Flag name
CH1 Input range upper limit
CH1 Input range lower limit
(Fixed to 0)
CH1 Rate alarm upper limit
CH1 Rate alarm lower limit
(Fixed to 0)
CH1 Alert 1
CH1 Alert 2
CH1 Alert 3
CH1 Alert 4
CH1 Heater disconnection
detection
CH1 Loop disconnection
detection
CH1 Output off-time current error
(Fixed to 0)
b3 b2 b1 b0
0 0
Alert definition
When the temperature process value (PV) has exceeded the temperature measuring
*1
range of the set input range
When the temperature process value (PV) has fallen below the temperature measuring
*1
of the set input range
range
(Not used)
When the variation amount of the temperature process value (PV) is equal to or larger
than the rate alarm upper limit value
When the variation amount of the temperature process value (PV) is equal to or smaller
than the rate alarm lower limit value
(Not used)
When Alert 1 has occurred ( Page 72 Alert Function)
When Alert 2 has occurred ( Page 72 Alert Function)
When Alert 3 has occurred ( Page 72 Alert Function)
When Alert 4 has occurred ( Page 72 Alert Function)
When a heater disconnection has been detected ( Page 86 Heater Disconnection
Detection Function)
When a loop disconnection has been detected ( Page 91 Loop Disconnection
Detection Function)
When an output off-time current error has been detected ( Page 90 Output Off-time
Current Error Detection Function)
(Not used)
CH1 CH2
401 601
5 6
CH3 CH4
801 1001
7 8