Yaskawa 120 Series I/O Modules - Manual (Page 163)

4 Analog I/O Specifications
4.1.3 Analog Input Modules (4 to 20-mA, 4 channels)
4-16
3) The following diagram shows the circuit configuration.
Current signal source
Multiplexer
Shield 1
Current signal source
Status
indication
Photocoupler
Shield 2
Voltage signal source
Shield 3
Voltage signal source
Shield 4
Insulated
DC/DC
converter
0 V (analog)
4 to 20 mA
4 to 20 mA
1 to 5 V
1 to 5 V
+5 V
+5 V
+15 V
-15 V
0 V
Internal circuits A/D converter
4700 pF