ABB AC500 PLC Hardware Manual page 385

The electrical connection of the I/O channels is carried out using the 40 terminals of the I/O ter-
minal unit. I/O modules can be replaced without re-wiring the terminal units.
The terminals 1.8 to 4.8 and 1.9 to 4.9 are electrically interconnected within the I/O terminal unit
and always have the same assignment, irrespective of the inserted module:
● Terminals 1.8 to 4.8: process voltage UP = +24 VDC
● Terminals 1.9 to 4.9: process voltage ZP = 0 VDC
The assignment of the other terminals:
Terminals
1.0 to 1.7
2.0 and 3.0
4.0
2.1 and 3.1
4.1
2.2 and 3.2
4.2
2.3 and 3.3
4.3
2.4
3.4 and 4.4
2.5
3.5 and 4.5
2.6
3.6 and 4.6
2.7
3.7 and 4.7
2019/04/17
Signal
unused
I0 and I1
N01
I2 and I3
N23
I4 and I5
N45
I6 and I7
N67
R0
NO0 and NC0
R1
NO1 and NC1
R2
NO2 and NC2
R3
NO3 and NC3
3ADR010121, 13, en_US
Device Specifications
I/O Modules > Digital I/O Modules
Description
Input signals for the digital
inputs I0 and I1
Neutral conductor for the dig-
ital inputs I0 and I1
Input signals for the digital
inputs I2 and I3
Neutral conductor for the dig-
ital inputs I2 and I3
Input signals for the digital
inputs I4 and I5
Neutral conductor for the dig-
ital inputs I4 and I5
Input signals for the digital
inputs I6 and I7
Neutral conductor for the dig-
ital inputs I6 and I7
Common contact of the first
relay output
NO and NC contacts of the
first relay output
Common contact of the
second relay output
NO and NC contacts of the
second relay output
Common contact of the third
relay output
NO and NC contacts of the
third relay output
Common contact of the fourth
relay output
NO and NC contacts of the
fourth relay output
385