Hitachi EHV+ Series Applications Manual page 151

(b) Wiring for 32/64-point input module (EH-XD32,EH-XD64) (Based on CE marking)
EH-XD32/64
0
1
2
31
C
Common
terminal
Note:
1] Wire only the signal line through the shield cable, and provide class D grounding on the shield
cable side.
2] Do not wire the common line or S terminal line through the shield cable. Be sure to wire them
independently and separately from the power line, I/O lines or power supply line.
3] The supply line to the external power supply should be wired as close as possible to the common
terminal of the output module.
(c) AC input module
When using the AC input module, if the wiring route gets longer, a phenomenon that voltage is generated
on the input terminal though there is no signal actually because the leak current flows by the stray capacity
between wirings may occur.
External device
There are the following two methods 1] and 2] as measures. Please limit the voltage caused by the
electrostatic combination on the input terminal to half of the maximum OFF voltage of the input module.
1] Lower impedance of the input module by connecting the dummy resistance with the input terminal in
parallel.
2] Connect the external power supply to the external device side.
External device
Shield cable
Class D grounding
＋
＋
External power supply
Dummy resistance
4 – 7
Chapter 4
Signal line
Common line
AC input module
AC input module
Installation (hardware)