SIEMENS
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Siemens IK PI · 2015
AS-Interface
Masters
Masters for SIMATIC S7
CM 1243-2
4
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Overview
CM 1243-2 communication module for S7-1200
The CM 1243-2 communication module is the AS-Interface
master for the SIMATIC S7-1200 and has the following features:
•
Connection of up to 62 AS-Interface slaves
•
Integrated analog value transmission
•
Supports all AS-Interface master functions according to the
AS-Interface Specification V3.0
•
Indication of the operating state on the front of the device
displayed via LED
•
Display of operating mode, AS-Interface voltage faults,
configuration faults and peripheral faults via LED behind the
front panel
•
Compact enclosure in the design of the SIMATIC S7-1200
•
Suitable for AS-i power 24V: in combination with the optional
DCM 1271 data decoupling module, a standard 24 V power
supply unit can be used.
•
Configuration and diagnostics via the TIA Portal
Design
The CM 1243-2 communication module is positioned to the left
of the S7-1200 CPU and linked to the S7-1200 via lateral con-
tacts.
It has:
•
Terminals for two AS-i cables (internally jumpered) via two
screw terminals each respectively
•
One terminal for connection to the functional ground
•
LEDs for indication of the operating state and fault statuses of
the connected slaves
The screw terminals (included in scope of supply) can be
removed to facilitate installation.
Function
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 activated 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 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 power required
exceeds 4 A.
Notes on safety:
The use of this product requires suitable protective measures
(e.g. network segmentation for IT security among others) in
order to ensure safe plant operation, see
www.siemens.com/industrialsecurity
.
Configuration
To configure CM 1243-2, you require STEP 7 V11+ SP2 or STEP
7 V12 or higher.
For STEP 7 V11+ SP2 or higher, the additional Hardware Support
Package for CM 1243-2 is required. This is available via the
Industry Online Support Portal, see
.
The software enables user-friendly configuration and diagnos-
tics of the AS-Interface master and any connected slaves.
Alternatively, you can also apply the AS-Interface ACTUAL
configuration at the "touch of a button" via the control panel
integrated in the TIA Portal/STEP 7.
© Siemens AG 2014