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 transfer 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 supports 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 configuration 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, synchronization 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 configuration 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.