Connect Pin 4 (B/+) on the module to the B/+ terminal of your device, and Pin 5 (A/-) to the A/- terminal. Connect Pin 8 (GND) as a common reference. Enable termination resistors at both ends for long runs (>100m).
: The most comprehensive guide is the S7-1200 Programmable Controller System Manual, which covers hardware installation, wiring, and software configuration. 6es7241-1ch30-1xb0 manual pdf
6ES7241-1CH30-1XB0 Siemens SIMATIC S7-1200 Communication Board (CB 1241) Connect Pin 4 (B/+) on the module to