Electrical Connections Of The As-I Master - Siemens SIMATIC S7-1200 System Manual

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Table of Contents

Technical data

Dimensions and weights

Weight including packaging

Electrical connections of the AS-i master

Power supply of the AS-i master CM 1243-2

The AS-i master CM 1243-2 is supplied over the communications bus of the S7-1200. This

means that a diagnostics message can still be sent to the S7-1200 following failure of the

AS-i supply voltage. The connection to the communications bus is on the right-hand side of

the AS-i master CM 1243-2.

AS-Interface terminals

The removable terminal for connecting the AS-i cable is located behind the lower cover on

the front of the AS-i master CM 1243-2.

If the AS-i shaped cable is used, you can recognize the correct polarity of the cable by

means of the symbol

Information on how to remove and re-install the terminal block can be found in the

Installation chapter (Page 68).

S7-1200 Programmable controller

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

Technical specifications

A.16 Communication interfaces