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Siemens CM1243-2 Communication Module

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Siemens CM1243-2 Communication Module
Manufacturer: Siemens

The CM 1243‑2 supports all specified functions of the AS-Interface Specification V3.0.

The values of the digital AS-i slaves can be addressed via the process image of the S7-1200. During configuration of the slaves in the TIA Portal, the values of the analog AS-i slaves can also be accessed directly in the process image.

It is also possible to exchange all data of the AS-i master and the connected AS-i slaves with the S7‑1200 via the data record interface.

Changeover of the operating mode, automatic application of the slave configuration and the re-addressing of a connected AS-i slave can be implemented via the control panel of the CM 1243-2 in the TIA Portal.

The optional DCM 1271 data decoupling module (see "Power supplies and data decoupling units") has an integrated detection unit for detecting ground faults on the AS‑Interface cable. The integrated overload protection also disconnects the AS-Interface cable if the drive current required exceeds 4 A.

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Features Applications Model
  • More flexibility and versatility in the use of SIMATIC S7‑1200 as the result of a significant increase in the number of digital and analog inputs/outputs available
  • Very easy configuration and diagnostics of the AS-Interface via the TIA Portal (STEP 7 V11 + SP2 or higher)
  • No need for the AS‑i power supply unit with AS‑i Power24V: The AS‑Interface cable is powered through an existing 24‑V‑DC‑PELV power supply unit. For decoupling, the AS‑i DCM 1271 data decoupling module is required, see "Power supplies and data decoupling units".
  • LEDs for indication of fault statuses for fast diagnostics
  • Monitoring of AS-Interface voltage facilitates diagnostics
  • The CM 1243-2 is the AS-Interface master connection for the 12xx CPUs of the SIMATIC S7-1200. Connection to the AS-Interface greatly increases the number of inputs and outputs available for S7-1200 (max. 496 DI/496 DO on the AS-Interface per CM).
  • The integrated analog value processing also makes the analog values available at the AS-Interface for the S7-1200 (per CM up to 31 standard analog slaves, each with up to 4 channels, or up to 62 A/B analog slaves, each with up to 2 channels).
Mfr. Part No. Description
3RK7243-2AA30-0XB0 SIMATIC S7-1200, CM 1243-2

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