Appendix 3 How To Use Analog Inputs Built In Cpu Module For Current Inputs - Mitsubishi Electric MELSEC iQ-F FX5U User Manual

Appendix 3
The analog input of the built-in analog can be used as current input (4 to 20 mA DC) for the FX5U CPU module.
Method of using the FX5U CPU module for current inputs (4 to 20 mA DC)
The FX5U CPU module is designed to handle only voltage inputs.
However, the FX5U CPU module can be used for current inputs by connecting a 250  resistor (tolerance: 0.5%) between the
V+ terminal and the V- terminal.
■Example of wiring
Converting 4 to 20 mA
into 1 to 5 V
*1
250 
*1 Instead of a 250  resistor, a 500  resistor can be connected in parallel. When selecting a resistor, consider the maximum input
current.
*2 For unused channels, short-circuit the "V+" and "V-" terminals.
■Specifications
Item
Analog input
Digital output
Resolution
Absolute maximum input
*1 The digital output value can be changed using the scaling function.
■Example of using the scaling signal
Default characteristics
(Upper limit value: 4000, lower limit value: 0)
Digital output value
2000
400
0
4 mA
For details of the scaling function, refer to MELSEC iQ-F FX5 User's Manual (Analog Control).
APPENDIX
164

Appendix 3 How to use analog inputs built in CPU module for current inputs

How to use analog inputs built in CPU
module for current inputs
82.7 k
V+
V-
33 k
*2
Specifications
4 to 20 mA DC
*1
400 to 2000
10 A
-2 mA, +60 mA
Current input
20 mA
CH
CH No. goes in  of V+, CH.
Characteristics converted by the scaling function
(When "upper limit value: 4500, lower limit value: -500" is set)
Digital output value
2000
0
4 mA
-500
Current input
20 mA