ABB AC31 Assembly And Operation Manual page 94

AC31 Adapters
Replacement devices: I/O modules > Replacement device 07AI91-AD
Fig. 60: Current input with external resistor
94
Analog signal lines must be routed in shielded cables. The shield must be
earthed on both sides and should be earthed to replacement device and signal
source / signal sink as close as possible.
3ADR010122, 8, en_US 2018/09/24