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 synchronized from the user program with the DPSYNC_FR system function.
• PROFIBUS DP slave (not when DP master)
• PG/OP communication
• S7 communication
• Open user communication via FDL
• Time synchronization via PROFIBUS

Master for PROFIBUS DP

The CM 1542-5 operates as DP-V1 master. It handles data transfer 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 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 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 assignment. 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)

Open user communication (SEND/RECEIVE) via FDL

Based on Layer 2 (FDL) of PROFIBUS, the CM 1542-5 offers a simple, optimized interface for process or field communication.

This interface offers integrated, high-performance communication between SIMATIC S5, SIMATIC S7, SIMATIC 505 and PC. SEND/RECEIVE provides not only the SDA service (PLC/PLC connections) but also the SDN service (broadcast, multicast).

The communication partners are the automation systems:

• SIMATIC S7
  with CM 1542-5, CP 342-5, CP 343-5, CP 443-5 Extended and Basic
• SIMATIC S5
  with S5-95U with PROFIBUS interface, S5-115U/H, S5-135U, S5-155U/H with CP 5431 FMS/DP
• SIMATIC 505
  with CP 5434-FMS
• PCs
  with CP 5512, CP 5611 A2, CP 5621, CP 5613 A3, CP 5613 FO, CP 5614 A3, CP 5623, CP 5624
• Systems of other makes that are equipped with an FDL interface.

To use SEND/RECEIVE, function calls are required (TSEND/TRCV), which must be integrated into the STEP 7 user program.

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 available.

The CM 1542-5 supports:

• Time status value, daylight-saving time changeover, synchronization 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 therefore 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 V14 (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

Configuration

STEP 7 Professional V14 (TIA Portal) or higher is required for configuring the full range of functions of the CM 1542-5. The configuration data of the CM is always saved on the CPU and retained even after a PLC failure. It is therefore possible to replace a module without having to reload the configuration data from a programming device. The CPU transfers the configuration data to the CM during startup.

Configuration and programming of all SIMATIC S7 controllers connected to the network is possible over the network.

PROFIBUS DP configuration for SIMATIC S5/S7 and PG/PC