Siemens SIMATIC NET PROFIBUS manual Connecting the LAN Cable to Bus Connector 6ES7 972-0B.40

Passive Components for RS-485 Networks

5. Screw the green and red cores tight in the screw terminal.

LAN cable attachment for first and last station on the bus1

Switch = “ON” (terminating resistor activated)

A B A B

Cable shield must make good contact with the metal part.

LAN cable attachment for all further stations on the bus

Switch = “OFF” (terminating resistor deactivated)

A B A B

Cable shield must make good contact with the metal part.

1: The LAN cable must always be connected up on the left-hand side.

Figure 4-23 Connecting the LAN Cable to Bus Connector (6ES7 972-0B.40 ...)

6. Fasten the cover again with the screws.

Note

Stranded cores must only be used in screw terminals with wire-end ferrules fitted (0.25 mm2 complying with DIN 46228). Use only wire-end ferrules made of materials with permanently stable contact properties, for example copper with a tin-plated surface (not aluminum).

PROFIBUS Networks SIMATIC NET	4-43
6GK1970-5CA20-0AA1 Release 2 05/2000