SIEMENS
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Siemens IK PI · 2015
PROFIBUS
Communication for SIMATIC S7-1200
CM 1242-5
3
■
Design
The CM 1242-5 offers all the benefits of the S7-1200 design.
•
Rugged, compact plastic enclosure
•
Easily accessible connection and diagnostics elements,
protected by front flaps
•
Removable connecting terminals
•
Simple mounting on the mounting rail of the S7-1200
•
9-pin sub-D socket for the bus interface to PROFIBUS
The CM 1242-5 is plugged into the left-hand system bus inter-
face of the S7-1200. Power is supplied via the system bus of the
S7-1200 so that no extra cabling is required. The rugged RS485
interface is located on the underside of the module, protected by
the lower front flap.
■
Function
The CM 1242-5 provides the communication services for
integrating an S7-1200 into an automation solution as a
PROFIBUS DP slave.
PROFIBUS DP slave
The CM 1242-5 works as a DPV1 slave in accordance with
IEC 61158, handles data traffic completely autonomously, and
thus relieves the CPU of communication tasks.
The data areas of the distributed I/Os are transferred consis-
tently between CP and CPU.
Diagnosis
Extensive diagnostic options are available via STEP 7, including
•
Operating state of the CM
•
General diagnostics functions
•
Connection diagnostics
•
Message buffer
STEP 7 Basic V11 or higher is required for configuring the full
functional scope of the CP 1242-5.
Operator Control &
Monitoring
Operator Control &
Monitoring
SIMATIC S7-1200
with CM 1242-5
SIMATIC S7-1200
with CM 1242-5
G_IK10_XX_50106
PROFIBUS
PROFINET/
Industrial Ethernet
PROFIBUS
(LWL)
SIMATIC S7-300
PG/PC/IPC
OLM
OLM
© Siemens AG 2014