SIEMENS
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Siemens IK PI · 2015
PROFIBUS
Communication for SIMATIC S7-1500
CP 1542-5
3
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Function
The CP 1542-5 supports the following communications services:
•
PROFIBUS DP Master Class 1
- PROFIBUS DP (according to IEC 61158/61784)
- SYNC/FREEZE: The outputs or inputs can be synchronized
from the user program with the DPSYNC_FR system
function.
•
PROFIBUS DP slave (not when DP master)
•
PG/OP communication
•
Time synchronization via PROFIBUS
Master for PROFIBUS DP
The CP 1542-5 operates as DP-V1 master. It handles data trans-
fer independently and allows up to 32 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 CP 1542-5 is
able to connect 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 CP 1542-5 is a DP-V1 master; in other words, it also sup-
ports the acyclic standard services, including alarm handling.
The CP 1542-5 also supports the functions SYNC, FREEZE, and
constant bus cycle time.
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 CP 1542-5 supports operation with a diagnostic repeater
(including activation of topology identification on the diagnostic
repeater).
There are no differences between the CP
1542-5 and the integral
DP master interface of the S7-1500 CPU with regard to configu-
ration and programming. The distributed I/O is therefore handled
like the central I/O just as for the CPU. Regardless of the scale
of the system, the CP 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 coupling to the following devices:
•
Programming devices (PG/OP communication)
•
HMI devices (OP)
Time synchronization
Time synchronization is used to set the time of day throughout
the plant.
The CP 1542-5 is capable of forwarding the time of day of the
S7-1500 CPU to PROFIBUS. Conversely, the CP of the S7-1500
CPU can make an existing time of day available on PROFIBUS.
The CP 1542-5 supports:
•
Time status value, daylight-saving time changeover, synchro-
nization status
Diagnostics
Extensive diagnostics options are available with STEP 7
Professional of the TIA Portal V12 SP1 or higher, including:
•
Status of the CP
•
General diagnostics and statistics functions
•
Connection diagnostics
•
Bus statistics
•
Alarm buffer
•
Support of operation with diagnostic repeater
Configuration
STEP 7 Professional of the TIA Portal V12 SP1 or higher is
required for configuring the full range of functions of the
CP 1542-5. The configuring data of the CP are always saved
on the CPU and are retained even after a PLC failure. A module
can therefore be replaced without having to reload the configu-
ration data from a programming device. The CPU transfers the
configuration data to the CP during start-up.
Configuration and programming of all SIMATIC S7 controllers
connected to the network is possible over the network.
© Siemens AG 2014