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Siemens IK PI · 2015
PROFIBUS
Communication for SIMATIC S7-1500
CM 1542-5
3
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Function
The CM 1542-5 supports the following communication services:
•
PROFIBUS DP Master Class 1
- PROFIBUS DP (according to IEC 61158/61784)
- SYNC/FREEZE: The outputs and/or inputs can be synchro-
nized from the user program with the DPSYNC_FR system
function.
•
PROFIBUS DP slave (not when DP master)
•
PG/OP communication
•
S7 communication
•
Time synchronization via PROFIBUS
Master for PROFIBUS DP
The CM 1542-5 operates as DP-V1 master. It handles data trans-
fer independently and allows slaves to be connected, such as
the CM 1242-5 as a DP slave, DP slaves of the ET 200 distributed
I/O system, etc. This means that the CM 1542-5 is able to con-
nect the S7-1500 station to PROFIBUS DP and is the ideal
expansion to the integrated DP master interfaces of the
S7-1500 CPUs (CPU 1516 and larger) for establishing additional
PROFIBUS DP lines.
The CM 1542-5 is a DP-V1 master; in other words, it also
supports the acyclic standard services, including alarm
handling. The CM 1542-5 also supports the functions SYNC and
FREEZE, constant bus cycle time and data record routing.
During normal operation, it is also possible to activate or
deactivate DP slaves. Among other things, this allows the
step-by-step commissioning of subprocesses.
A diagnostic repeater allows the line to be diagnosed during
operation, enabling line faults to be detected at an early stage.
The CM 1542-5 supports operation with a diagnostic repeater
(including activation of topology identification on the diagnostic
repeater).
The distributed I/O is handled like the central I/O from the user's
point of view. This means that there are no differences between
the CM 1542-5 and the integrated DP master interface of the
S7-1500 CPU in terms of configuration and parameter assign-
ment. Regardless of the scale of the system, the CM 1542-5 has
extremely short response times.
PG/OP communication
PG/OP communication allows all S7 stations connected to the
network to be remotely programmed.
•
S7 routing:
With the aid of routing it is possible to use
programming device communication across different
networks.
S7 communication
S7 communication is used for the coupling
•
between SIMATIC S7 automation systems
•
and programming devices (PG/OP communication)
•
to PCs, e.g. CP 5711 with SOFTNET-PB S7, CP 5623 etc.
•
and HMI devices (OPs)
Time synchronization
Time synchronization is used to set the time of day throughout
the plant.
The CM 1542-5 is capable of forwarding the time of day of
the S7-1500 CPU to PROFIBUS. Conversely, the CM of the
S7-1500 CPU can make an existing time on PROFIBUS avail-
able.
The CM 1542-5 supports:
•
Time status value, daylight-saving time changeover, synchro-
nization status
Data record routing
The CM 1542-5 supports the data record routing function. With
this option, the CP can be used as a router for data records that
need to be sent to field devices (DP slaves). Data records from
devices that are not connected directly to PROFIBUS and there-
fore have no direct access to the DP slaves are forwarded to the
DP slaves by the CM.
Diagnostics
Extensive diagnostic options are available with STEP 7
Professional V13 (TIA Portal), including:
•
Operating status of the CM
•
General diagnostics and statistics functions
•
Connection diagnostics
•
Bus statistics
•
Alarm buffer
•
Support of operation with diagnostic repeater
© Siemens AG 2014