Wiring
3-10
IM 178-4
C79000-G7076-C178-01
Connecting the Bus Connector
To connect the bus connector, follow the steps outlined below:
1. Plug the bus connector on to the IM 178-4.
2. Secure the bus connector on the IM 178-4 with the screws.
3. If the bus connector is at the start or end of a segment, the terminating resistor
must be activated (switch setting ”ON”) (see Figure 3-5).
Make sure that the nodes on which the terminating resistor is activated are always
supplied with voltage during startup and operation.
Terminating
resistor
activated
on
off
Terminating
resistor not
activated
on
off
Figure 3-5
Bus connector (6ES7 972-0B?10-0XA0): Terminating resistor activated and
deactivated