ABB AC500 V3 Hardware Manual page 344

Device specifications
I/O modules > Digital I/O modules
The module provides several diagnosis functions (see chapter Diagnosis and State LEDs ).
Internal data exchange
Digital inputs (bytes)
Digital outputs (bytes)
Counter input data (words)
Counter output data (words)
I/O configuration
The module itself does not store configuration data. It receives its parameterization data from
the master device of the I/O bus (CPU or communication interface module) during power-up of
the system.
Hence, replacing I/O modules is possible without any re-parameterization via software.
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CAUTION!
The process supply voltage must be included in the grounding concept (e. g.
grounding of the negative pole).
NOTICE!
Risk of damaging the PLC module!
The following has to be considered when connecting input and output voltages
to the module:
– All 230 V AC feeds must be single phase from the same supply system.
– Connection of 2 or more relay contacts in series is possible; however, vol-
tages above 230 V AC and 3-phase loads are not allowed.
– The 4 change-over contacts of the relays are galvanically isolated from
channel to channel. This allows to connect loads of 24 V DC and 230 V AC
to relay outputs of the same module. In such cases it is necessary that both
supply voltages are grounded to prevent unsafe floating grounds.
– All input signals must come from the same phase of the same supply
system (together with the used neutral conductor). The module is designed
for 120/230 V AC max., not for 400 V AC, not even between two input
terminals.
– All neutral conductor connections must be common to the same supply
system, since the terminals 4.0 to 4.3 are interconnected within the module.
Otherwise, accidental energization could occur.
NOTICE!
Risk of damaging the PLC module!
There is no internal short-circuit or overload protection for the relay outputs.
Protect the relay contacts by back-up fuses of 6 A max. (characteristic gG/gL).
Depending on the application, fuses can be used for single channels or module-
wise.
3ADR010278, 3, en_US
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2022/01/31