ABB AC31 Assembly And Operation Manual page 95

Fig. 61: Resistance thermometer
1) Return conductor
2) Twisted wire pair in the cable
(*) 3-wire
For temperature measurements with PT100/PT1000 resistors, the wiring to the existing device
must be changed. A 4-wire temperature measurement is not possible with the replacement
device. Based on the above figure, a 3-wire temperature measurement can be implemented.
1.5.3.2.3 Configuration
The existing device had a DIP switch on the upper printed circuit board. Since the replacement
device is not equipped with an upper printed circuit board, the DIP switch is arranged on the
lower printed circuit board instead.
2018/09/24
Replacement devices: I/O modules > Replacement device 07AI91-AD
3ADR010122, 8, en_US
AC31 Adapters
95