Mitsubishi Electric MELSEC iQ-F FX5 - 35.10 How to Use Analog Inputs Built in CPU Module for Current Inputs

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35 CPU MODULE BUILT-IN ANALOG FUNCTION
35.10 How to Use Analog Inputs Built in CPU Module for Current Inputs
35.10 How to Use Analog Inputs Built in CPU Module for
Current Inputs
The analog input of the built-in analog can be used as the current input (4 to 20 mA DC) for the FX5U CPU module.
Method of use with the current input (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 (precise resistance: 0.5%) between the V+ terminal and the V- terminal.
■Example of wiring
*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
*1 The digital output value can be changed using the scaling function.
■Example of using the scaling signal
For details of the scaling function, refer to Page 582 Scaling function.
Item Specifications
Analog input 4 to 20 mA DC
Digital output value 400 to 2000
*1
Resolution 10 A
Absolute maximum input -2 mA, +60 mA
Default characteristics
(Upper limit value: 4000, lower limit value: 0)
Characteristics converted by the scaling function
(When the upper limit value and the lower limit value are set to
4500 and -500 respectively)
CH No. goes in  of V+, CH.
CH
33 kΩ
82.7 kΩ
V-
V+
Converting 4 to 20 mA
into 1 to 5 V
250 Ω
*1
*2
2000
Digital output value
Current input
400
0
4 mA 20 mA
2000
Digital output value
Current input
-500
0
4 mA 20 mA