Siemens SIMATIC S7-1200 System Manual page 1141

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Table of Contents

Case 1: RS422 with cable break detection

● Mode of operation: RS422

● Receive line initial state: Reverse bias (biased with R(A) > R(B) > 0V)

● Cable break: Cable break detection enabled (transmitter always active)

Case 2: RS422 No cable break detection, forward bias

● Mode of operation: RS422

● Receive line initial state: Forward bias (biased with R(B) > R(A) > 0 V)

● Cable break: No cable break detection (transmitter enabled only while transmitting)

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Communication processor and Modbus TCP

13.3 Point-to-point (PtP) communication