13.2 Communication modules
COM1004COM1003
COM1001
COM1002 COM1005
Figure 1034: Communication module options
The Ethernet ports marked with LAN A and LAN B are used with redundant Ethernet
protocols HSR and PRP. The third station bus Ethernet port without the LAN A or
LAN B label is an interlink port which is used to connect a device to the common
redundant Ethernet channel.
Table 1660: Ports in communication modules
Port Type Description
X0 RJ-45 HMI
X1 RJ-45 or LC Ethernet (LAN A)
X2 RJ-45 or LC Ethernet (LAN B)
X3 RJ-45 or LC Ethernet (Interlink)
X6 SFP - LC Protection communication
1
X7 FO - ST Serial communication
X8 TP
2
Serial communication/IRIG-B
1
If a galvanic pilot wire is used as the protection communication link, the pilot wire modem
RPW600 is required. A single-mode SFP transceiver and corresponding fiber-optic cable is used
to connect REX640 with the RPW600 modem. The recommended minimum length of this cable is
3 m.
2
2- or 4-wire twisted pair
1MRS759142 F Protection relay's physical connections
REX640
Technical Manual
1937
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