ABB AC31 Assembly And Operation Manual page 28

AC31 Adapters
Replacement devices: CPU > Replacement device 07KT9x-AD
Fig. 20: Arrangement of the 16 digital inputs
The digital input states are always indicated by the LEDs DI0-DI15:
Fig. 21: DA501 LED status indication
Characteristics of the digital inputs:
● All 16 inputs have the same potential ZP as all other inputs/outputs. The electrical isolation
included in the existing devices is no longer available.
● Input delay (0->1 or 1->0): Typically 0.1 ms, configurable from 0.1 to 32 ms.
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The signal coupling of the input signals is no longer realized via optocoupler. All
channels of the DA501 and DA502 modules have reference to ZP. The AGND1/
AGND2 of the analog channels are internally connected to ZP via PTC resis-
tors. For information on terminal assignment, refer to figure Fig. 18).
3ADR010122, 8, en_US 2018/09/24