Siemens 6GK1543-0AA00 | SIMATIC S5 Communication Module

The Siemens 6GK1543-0AA00 connects SIMATIC S5 controllers to PROFIBUS DP networks. This communication processor (CP5430 FMS/DP) handles high-speed data exchange with field devices. You can integrate remote I/O stations, drives, and HMIs through a single interface. It supports both master and slave operation modes on the same bus. Consequently, this module modernizes legacy S5 systems without replacing the entire PLC.

Technical Specifications Overview

Parameter	Detailed Specification
Model	Siemens 6GK1543-0AA00
Category	SIMATIC S5 PROFIBUS Communication Module (CP5430)
Protocol Support	PROFIBUS DP, FMS (Fieldbus Message Specification)
Interface Type	RS-485 (9-pin SUB-D female)
Transmission Rate	9.6 kbit/s to 12 Mbit/s (automatic detection)
Bus Access	Token passing (master) / Polling (slave)
Number of Slaves	Up to 125 (as master)
Process Data Size	128 bytes input + 128 bytes output
Internal Buffer	32 KB RAM (battery-backed)
Operating Voltage	5V DC from backplane (typical 700 mA)
External Supply	24V DC (50 mA for bus termination)
Dimensions	250 mm x 25 mm x 130 mm (single-width)
Weight	0.52 kg (520 grams)
Energy Storage	Lithium battery for parameter retention
Operating Temperature	0°C to 60°C

Functional Features and Network Capabilities

The Siemens 6GK1543-0AA00 acts as a PROFIBUS DP master for distributed I/O. You can configure this module using COM5430 software on a programming device. It handles cyclic data exchange with up to 124 slaves autonomously. Furthermore, the module supports acyclic services for parameter uploads and diagnostics.

The onboard 32 KB buffer stores process images and configuration data securely. The backup battery preserves this information during main power interruptions. Additionally, the RS-485 interface includes optical isolation for noise immunity. You can connect this module directly to standard PROFIBUS cables and connectors.

Installation and Configuration Steps

First, insert the Siemens 6GK1543-0AA00 into any SIMATIC S5 rack slot. Next, set the station address using the DIP switches on the front panel. Then, connect the PROFIBUS cable to the 9-pin SUB-D port. Finally, terminate the bus at both ends using the built-in resistor switch.

You must provide external 24V DC supply for the bus termination circuitry. The module does not draw this voltage from the S5 backplane. Always use PROFIBUS-certified cables for reliable communication at high speeds. Furthermore, keep the total bus length within limits based on your baud rate.

This communication module modernizes S5 systems for today’s automation networks. It connects seamlessly to ET200 remote I/O and SINAMICS drives. You can also link multiple S5 controllers through PROFIBUS for coordinated tasks. The CP5430 replaces older point-to-point links with efficient fieldbus technology.