Product Overview

The Siemens 6ES7545-5DA00-0AB0 SIMATIC ET 200SP PROFIBUS DP Communication Module is a CM DP communication module that connects an ET 200SP CPU to a PROFIBUS DP network. It adds a dedicated RS485 fieldbus interface to the distributed I/O system, allowing the ET 200SP controller to exchange process data with other PROFIBUS-compatible automation equipment.

Unlike the point-to-point communication modules used for connecting individual serial instruments, the CM DP handles communication across a PROFIBUS DP fieldbus. It can operate as either a DP Master or a DP Slave, depending on the configured application. This makes it suitable for different control architectures, from managing distributed I/O stations to exchanging data with a higher-level PROFIBUS controller.

The module is installed directly to the right of a compatible ET 200SP CPU. Its external PROFIBUS connection uses a 9-pin D-sub socket, while communication with the CPU takes place through the ET 200SP backplane bus.

A typical application is a production line containing several distributed I/O stations. The central controller can use the CM DP as a PROFIBUS DP Master to communicate with remote DP devices installed near motors, conveyor sections, pneumatic equipment, and machine sensors. Instead of routing every field signal back to the main control cabinet, the distributed stations collect local signals and exchange process data over the PROFIBUS network.

The module supports transmission rates up to 12 Mbit/s and can manage up to 125 DP slaves when operating as a DP Master. Automatic baud rate detection simplifies network commissioning by identifying the transmission rate used on the PROFIBUS segment.

Another useful feature is its support for DPV1 communication services. This allows the system to exchange acyclic data records in addition to the cyclic process data used for normal control operations. Engineers can therefore access device parameters and diagnostic information without treating every communication task as part of the regular I/O update cycle.

The CM DP also supports S7 communication, PG/OP communication, routing, and diagnostic functions. These capabilities are useful when the PROFIBUS network needs to support both machine control and engineering access.

One configuration detail deserves attention: the module operates alternatively as a DP Master or DP Slave, not in both roles simultaneously. The selected operating mode must match the intended network architecture and the capabilities of the connected ET 200SP CPU.

For maintenance engineers working with distributed automation systems, the 6ES7545-5DA00-0AB0 is particularly relevant when PROFIBUS DP connectivity needs to be added to an ET 200SP control station.

Technical Specifications

Product Features

• PROFIBUS DP Connectivity: Connects an ET 200SP CPU to a PROFIBUS DP fieldbus through an integrated RS485 interface.
• Dual Operating Modes: Supports configuration as either a PROFIBUS DP Master or DP Slave.
• High-Speed Fieldbus Communication: Supports transmission rates up to 12 Mbit/s.
• 125 DP Slave Capacity: Allows the module to manage up to 125 DP slaves in Master operation.
• Automatic Baud Rate Detection: Identifies the transmission rate used on the PROFIBUS network.
• DPV1 Support: Enables acyclic data exchange for parameter access and diagnostic information.
• Distributed I/O Integration: Connects remote PROFIBUS devices to the ET 200SP control architecture.
• S7 Communication: Supports communication services within compatible SIMATIC automation systems.
• PG/OP Communication: Allows engineering and operator communication through the active interface.
• Routing Functions: Supports routing services for engineering access through the network.
• Line Diagnostics: Helps identify communication line problems during system operation.
• Electrical Isolation: Provides electrical separation between the backplane bus and the PROFIBUS interface.
• Diagnostic LED: Provides visual indication of module diagnostic conditions.

Working Principle

The 6ES7545-5DA00-0AB0 operates as the PROFIBUS communication interface for an ET 200SP CPU. It handles the exchange of data between the distributed I/O controller and devices connected to the PROFIBUS DP network.

The basic communication path is:

ET 200SP CPU → Backplane Bus → CM DP Communication Module → RS485 Interface → PROFIBUS DP Network → Connected DP Devices

The way the module handles communication depends on whether it is configured as a Master or Slave.

When operating as a DP Master, the module manages communication with configured DP slave devices. It initiates cyclic data exchange, reads input information, and transfers output data according to the configured network arrangement. The ET 200SP CPU can then use the received process values in its control program.

For example, a manufacturing system may use remote I/O stations to collect signals from conveyor sensors and motor control equipment. The CM DP communicates with these stations over PROFIBUS DP, allowing the controller to receive operating conditions and send output commands without requiring individual field signals to return directly to the central cabinet.

When operating as a DP Slave, the module exchanges data with an external DP Master. The ET 200SP station makes its configured input and output data available through the PROFIBUS connection. This arrangement is useful when an ET 200SP station needs to operate as a distributed subsystem under a higher-level PLC.

The module supports cyclic process data exchange as well as DPV1 acyclic communication. Cyclic communication handles the regular exchange of machine signals, while acyclic services allow access to additional device information, parameters, and diagnostic records.

Automatic baud rate detection identifies the transmission rate of the PROFIBUS network. The supported maximum is 12 Mbit/s, although the actual network rate depends on the configuration and connected devices.

The RS485 interface carries the PROFIBUS signals over the bus cable. Correct cable routing, bus termination, connector installation, and network topology are necessary to prevent communication interruptions, particularly in installations containing multiple distributed stations.

An important configuration point is that DP Master and DP Slave operation are alternative modes. The module must be configured for the required role before the PROFIBUS network is commissioned.

Role in the SIMATIC ET 200SP Control Architecture

The 6ES7545-5DA00-0AB0 provides the PROFIBUS DP connection for an ET 200SP CPU. It extends the station’s communication capabilities beyond its local I/O arrangement and allows the controller to participate in a larger distributed automation network.

A typical Master configuration follows this structure:

Central Automation System → PROFIBUS DP Network → CM DP Master → ET 200SP CPU → Local I/O Modules

In a Slave configuration, the communication direction is arranged around an external PROFIBUS Master:

Higher-Level PLC / DP Master → PROFIBUS DP Network → CM DP Slave → ET 200SP CPU → Local I/O Modules

The module is especially useful in systems where the ET 200SP platform needs to communicate with existing PROFIBUS-based automation equipment. It allows the distributed I/O station to participate in the established fieldbus architecture without changing the entire network to another communication standard.

In Master operation, the CM DP handles the communication relationship with configured slave devices. In Slave operation, it makes the ET 200SP station’s process data available to an external controller.

This distinction should be considered when selecting the module for a replacement or expansion project, since the required communication role determines the network configuration and engineering arrangement.

Industrial Applications

Installation and Maintenance

1. Verify the Module Type: Confirm that 6ES7545-5DA00-0AB0 is the required CM DP module and that the intended application requires PROFIBUS DP communication.
2. Check CPU Compatibility: Verify that the ET 200SP CPU supports the communication module and the selected DP Master or DP Slave configuration.
3. Inspect the Module: Examine the housing, 9-pin D-sub socket, and mounting contacts for physical damage or contamination.
4. Prepare the Station: Ensure that the ET 200SP mounting rail and CPU installation position are correctly prepared.
5. Isolate the System: Follow applicable electrical safety procedures before installing or removing the communication module.
6. Install the Module: Insert the CM DP directly to the right of the compatible ET 200SP CPU and check that it is correctly seated.
7. Connect the PROFIBUS Cable: Use a suitable PROFIBUS connector and connect the RS485 bus cable according to the network wiring arrangement.
8. Check Bus Termination: Verify that termination resistors are correctly enabled at the beginning and end of the PROFIBUS segment, as required by the network topology.
9. Configure the Operating Mode: Select either DP Master or DP Slave in STEP 7 or TIA Portal according to the intended network architecture.
10. Configure Network Parameters: Set the PROFIBUS address, transmission rate, connected devices, and required input/output data areas.
11. Perform Communication Testing: Check the DIAG indicator, verify network communication, and confirm that configured DP devices exchange process data correctly.
12. Document the Configuration: Record the PROFIBUS address, network topology, operating mode, connected devices, transmission rate, and diagnostic information for future maintenance.

Compatible System Components

Recommended Related Models

Key Advantages

• Adds a dedicated PROFIBUS DP interface to the ET 200SP CPU.
• Supports both DP Master and DP Slave operating modes.
• Handles up to 125 DP slaves in Master operation.
• Supports PROFIBUS transmission rates up to 12 Mbit/s.
• Provides automatic baud rate detection.
• Supports DPV1 acyclic communication and diagnostic services.
• Enables integration with existing PROFIBUS-based automation equipment.
• Supports routing and engineering access through the active interface.
• Provides electrical isolation between the backplane bus and PROFIBUS interface.

Technical FAQs

Can the 6ES7545-5DA00-0AB0 operate as both a PROFIBUS DP Master and DP Slave simultaneously?

No. The CM DP supports alternative operation as either a DP Master or a DP Slave. The required operating mode must be selected during hardware configuration in STEP 7 or TIA Portal. The network architecture and connected equipment determine which role is appropriate.

How many PROFIBUS DP slave devices can this module manage?

When configured as a DP Master, the module supports up to 125 DP slaves. The actual network configuration must also account for the available PROFIBUS addresses, device capabilities, communication timing, and the process data requirements of the connected equipment.

What is the maximum communication speed of the 6ES7545-5DA00-0AB0?

The maximum PROFIBUS transmission rate is 12 Mbit/s. The module supports automatic baud rate detection, allowing it to identify the transmission rate used by the connected PROFIBUS network. The selected rate must be supported by the network devices and installation.

What is the difference between cyclic and acyclic communication on this module?

Cyclic communication handles the regular exchange of process data between the DP Master and configured slave devices. It is used for normal machine operation, including reading sensor values and updating output states. Acyclic communication through DPV1 is used to access additional device information, parameters, and diagnostic records. Both communication methods can be used within the supported PROFIBUS DP configuration.