Siemens 6GK1161-3AA00 Communication Processor

Technical Overview

The 6GK1161-3AA00 industrial communication processor connects SIMATIC S5 controllers to Profibus-FMS and Profibus-DP networks. This module enables high-speed data exchange between automation devices and supervisory systems. It supports token passing and master-slave communication modes for flexible network architectures. The CP handles all bus protocol tasks independently, significantly reducing the CPU workload.

Key Technical Specifications

Parameter	Specification
Brand	Siemens
Model Number	6GK1161-3AA00
Product Type	Communication Processor (CP)
Series	SIMATIC S5
Network Support	Profibus-FMS and Profibus-DP
Transmission Rate	Up to 1.5 Mbps (configured via STEP 5)
Interface	9-pin D-sub (RS-485) for Profibus connection
Communication Modes	Token passing and master-slave
Data Buffering	Integrated for message management
Power Supply	5V DC from backplane bus
Approx. Weight	0.5 kg
Compatibility	S5-95U, S5-115U, S5-135U, S5-155U

Flexible Network Architecture Support

The module supports Profibus-FMS for multi-master communication and data exchange between controllers. It also works with Profibus-DP for high-speed I/O communication with distributed peripherals. Token passing ensures deterministic bus access for time-critical applications.

Protocol Handling and Performance

The onboard processor manages Profibus communication, error checking, and message retransmission automatically. This design allows the central CPU to focus on application logic rather than network management. The module adapts to the network’s baud rate configuration via STEP 5 software.

Robust Connectivity and Diagnostics

The 9-pin D-sub interface provides a standardized connection to Profibus networks. Front-panel LED indicators display the module’s operational status, bus activity, and error conditions. Engineers can quickly identify communication issues from the LEDs without external tools.