Siemens 6ES5526-3LG11 Communications Processor

Technical Overview

The 6ES5526-3LG11 communications processor (CP) manages serial data exchange between SIMATIC S5 controllers and external devices. This module supports the RK 512 protocol and standard data transfer procedures for versatile connectivity. It features multiple interface options including RS-232C and 20mA current loop. The onboard processor handles all communication tasks independently, freeing the central CPU for control duties. Consequently, this CP enables reliable data exchange with host computers, printers, and other automation equipment.

Key Technical Specifications

Flexible Interface Selection

The 6ES5526-3LG11 offers both RS-232C and 20mA current loop interfaces on a single module. This dual-interface design provides compatibility with legacy peripherals and modern serial devices. Engineers can select the appropriate interface based on the connected equipment’s requirements.

Protocol Handling and Data Exchange

This CP supports the Siemens RK 512 protocol for structured data transfer with host computers. It also handles standard data transfer procedures for flexible communication configurations. The module manages message assembly, error checking, and retransmission autonomously.

Data Buffering and Flow Control

Integrated data buffers store incoming and outgoing messages during transmission. This buffering ensures reliable data exchange even when the CPU handles time-critical control loops. Furthermore, the module supports hardware handshake signals for flow control in noisy environments.

Configuration and Compatibility

Users configure the 6ES5526-3LG11 using the STEP 5 programming software. The module works seamlessly with S5-115U, S5-135U, and S5-150U central controllers. Plant engineers will find this CP valuable for maintaining existing S5 installations requiring serial communication.Siemens 6ES5526-3LG11 Communications Processor SIMATIC S5 Serial