Bus Connector: Enabled And Disabled Terminating Resistor - Siemens SIMATIC S7-300 Hardware And Installation Manual

Inserting the bus connector into the module
1. Insert the wired bus connector into the module.
2. Screw-tighten the bus connector on the module.
3. If the bus connectoris at the start or end of a segment, you have to enable the
terminating resistor (Switch position "ON" see figure below)
Note
6ES7 972-0BA30-0XA0 bus connectors are not equipped with a terminating
resistor. You cannot connect it at the beginning or end of a segment.
Please make sure during start-up and normal operation that power is always
supplied to stations where the terminating resistor is active.
Terminating resistance switched on
Figure 7-8 Bus connector: Enabled and disabled terminating resistor
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
Terminating resistance switched off
on
off
Wiring
on
off
7-17