ABB AC500 PLC Hardware Manual page 1124

Device Specifications
Accessories > AC500-eCo
Mounting To insert the input simulator follow the procedure shown below.
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Make sure, that the power supply of the processor module is turned off.
CAUTION!
Risk of damaging the PLC modules!
The PLC modules can be damaged by overvoltages and short circuits.
Make sure, that all voltage sources (supply and process voltage) are
switched off before you are beginning with operations at the system.
Never connect any voltages > 24 VDC to clamp 4/5 of the terminal block
of input simulator TA571-SIM.
CAUTION!
Risk of damaging the Input Simulator or PLC modules!
The input simulator must only be used with AC500-eCo processor mod-
ules PM55x and PM56x. Never use the input simulator with other devices.
The input simulator must only be used for test and training purposes.
Never use it within productive plants.
Remove the terminal block for power supply from the processor module by a flat-blade
screwdriver.
Make sure, that all clamps of the onboard I/Os are totally open.
Use a flat-blade screwdriver to unplug the terminal block for power supply of the processor
module.
3ADR010121, 13, en_US 2019/04/17