SMC Networks SI Unit Operation Manual page 19

3.2.1. PROFINET/Power connection
The SI Unit has two PROFINET communication connectors. If only one connector is used, cover the
unused connector with a seal cap so that the protection rating of IP67 is maintained.
Caution
Seal caps must be fitted to all unused bus connector ports to ensure an IP67 rating.
IP67 rating must be maintained to guarantee PROFIsafe functionality.
For reasons of EMC a secure connection to the cable shield must be established on the M12 PROFINET
connectors (BUS IN/OUT).
Power and PROFINET cables must be installed correctly.
The 24 V supply for logic (PWR connector) and the 24 V supply for the valves (PWR(V) connector) should
be protected with an external fuse.
All external supplies should have the 0 V connected to functional earth according to EN 60204-1.
A functional earth cable must be connected to the M3 terminal.
If this product is connected using power cables that are more than 30 m long or go outside of a building
then external protection devices should be added to protect against electrical surge damage.
M12 4-pin plug
A-coded connector(PWR)
M12 4-pin socket
D-coded connector
(BUS IN/OUT)
Fig. 3-5 Pin allocations of PROFINET communication connectors
Pin Remarks
1 24 V (PWR(V))
2 0 V (PWR(V))
3 24 V (PWR)
4 0 V (PWR)
Fig. 3-4 Pin allocations of Power connectors
(BUS IN) Port1
Port type: MDI
Pin
Remarks
1 TD+ Transmit data+
2 RD+ Receive data+
3 TD- Transmit data-
4 RD- Receive data-
- 18 -
Description Remarks
RD+
TD+
RD-
TD-
(BUS OUT) Port2
Port type: MDI-X
Description
Receive data+
Transmit data+
Receive data-
Transmit data-
No.EX※※-OMU1006-B