Siemens AS-i Master CM 1243-2 a Manual page 15

AS-i data decoupling unit DCM 1271
The AS-i data decoupling unit DCM 1271 has no connection to the S7 communication bus.
The AS-i data decoupling unit DCM 1271 must therefore always be plugged into the left of
the last of up to three communication modules. When different communication modules are
used, it is recommended that the AS-i master CM 1243-2 is inserted to the left of the other
communication modules and the AS-i data decoupling unit DCM 1271 is inserted directly
onto the AS-i master CM 1243-2.
Figure 1-2
Note
Maximum configuration
With CPU firmware version V2.2 a maximum of one AS-i master CM 1243-2 can be
connected.
A possible expansion to the number of AS-i masters that can be connected will be
announced via the Service & Support Portal on the Siemens Internet site.
Figure 1-3
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200
Manual, 04/2013, A5E02655230010A/RS-AA/003
Maximum configuration: S7-1200, AS-i master CM 1243-2 and AS-i data decoupling unit
DCM 1271
Device arrangement: S7-1200, other communication modules, AS-i master CM 1243-2
and
AS-i data decoupling unit DCM 1271
Technical description
1.3 Permissible slots for modules
15