Connection
5.6 Supply voltage and PROFINET IO loop-through
SIMATIC RF185C, RF186C, RF188C, RF186CI, RF188CI
Operating Instructions, 04/2020, C79000-G8976-C512-03
45
5.6
Supply voltage and PROFINET IO loop-through
The RF18xC/RF18xCI communication modules each have two M12 connectors for the
supply voltage and PROFINET IO. Supply takes place via the 1st connection, the supply
voltage and PROFINET IO can be forwarded to another device via the 2nd connection.
Figure 5-12 Supply voltage and PROFINET IO loop-through
Notes for wiring
●
When wiring your assembly, you need to take into account the effect of the cable length
on the supply voltage at the RF18xC/RF18xCI.
●
The maximum supply current of the communication module is 16 A at 1L+ and 2L+ for a
maximum ambient temperature of 40 °C. At ambient temperatures of 40 °C to 55 °C, the
maximum supply current is 12 A. These values must not be exceeded. Take note of the
derating factor when operating at elevations above 2000 m (Page 24).
●
Adhere to the current carrying capacity of the connected cables, which depends on the
conductor material, the conductor cross-section and the ambient temperature.
NOTICE
Damages by using power supply cables that are not permitted
Only use power supply cables that have been approved for the operation of the device.
In case of cables you have assembled yourself or third-party products, make sure that
the cable cross-section is at least 1.5 mm².
If you do not observe the maximum permissible supply current and the cable cross-
section required, this may result in the cable isolation and contacts overheating and in
the device being damaged.
