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No.EX##-OMY0004
2.1.5. Do not carry out any repairs or modifications
It is prohibited for the user to carry out repair work or make modifications to the module. The housing must
not be opened. The module is protected against tampering by means of security labels. The security label
is damaged in the event of unauthorized repairs or opening of the housing. In this case, the correct
operation of the safety module can no longer be ensured.
In the event of an unrecoverable error, send the module to SMC or contact SMC immediately.
2.1.6. Mismatching and polarity reversal of connections
Take care to avoid the mismatching, polarity reversal or tampering of connections. For increased
protection against mismatching, connectors and slot markings are colour coded
2.2. Electrical safety
WARNING: Loss of safety function/hazardous shock currents
Incorrect installation can result in the loss of the safety function as well as hazardous shock currents.
Observe the notes on electrical safety.
Plan the modules used and their installation in the system according to the specific requirements.
Recheck plants and systems retrofitted with PROFIsafe.
2.2.1. Direct/indirect contact
Protection against direct and indirect contact according to VDE 0100 Part 410 / EN 61010-2-201 must be
ensured for all components connected to the system. In the event of an error, parasitic voltages must not
occur (single-fault tolerance).
Measures required:
Using power supply units with safe isolation (PELV).
Decoupling circuits, which are not PELV systems, using optocouplers, relays, and other components
which meet the requirements of safe isolation.
2.2.2. Power supply units for 24 V supply
Only use power supply units with safe isolation and PELV according to EN 61010-2-201. These power
supply units prevent short circuits between the primary and secondary side.
Make sure that the output voltage of the power supply does not exceed 30 V even in the event of an error.
Note if an SELV supply is used then the supply 0 V should be connected to protective bonding circuit in
accordance with the basic safety principle referred to in table D.1 of EN ISO 13849-2
2.2.3. Insulation rating
When selecting the equipment, please take into consideration the pollution degree and surge voltages
which may occur during operation.
The module is designed for surge voltage category II (according to DIN EN 60664-1). If you expect surge
voltages in the system, which exceed the values defined in surge voltage category II, implement additional
measures for voltage limitation.
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