Siemens 6ES5526-3LG01 | SIMATIC S5 CP526 SINEC

The Siemens 6ES5526-3LG01 enables SIMATIC S5 controllers to connect with SINEC H1 networks. This communications processor (CP526) handles TCP/IP-based data exchange over Ethernet. You can link multiple PLCs, host computers, and programming devices through a single module. It supports the H1 protocol (ISO 8802-3) for industrial messaging services. Consequently, this module bridges legacy S5 systems to modern network infrastructures.

Technical Specifications Overview

Parameter	Detailed Specification
Model	Siemens 6ES5526-3LG01
Category	SIMATIC S5 Communications Processor (CP526)
Network Protocol	SINEC H1 (ISO 8802-3 / TCP/IP compatible)
Interface Type	AUI (15-pin SUB-D) for external transceiver
Transmission Rate	10 Mbit/s (Ethernet)
Number of Connections	Up to 8 simultaneous links
Process Data Size	64 bytes per telegram (send/receive)
Internal Buffer	48 KB RAM (battery-backed)
Operating Voltage	5V DC from backplane (typical 800 mA)
External Supply	24V DC (100 mA for transceiver)
Dimensions	250 mm x 25 mm x 130 mm (single-width)
Weight	0.55 kg (550 grams)
Energy Storage	Lithium battery for RAM and parameter retention
Indicators	6 LEDs (power, run, receive, transmit, error, collision)
Operating Temperature	0°C to 60°C

Functional Features and Network Capabilities

The Siemens 6ES5526-3LG01 manages all Ethernet communication tasks independently. You can configure this module using COM526 software on a PG or PC. It handles connection establishment, data segmentation, and error recovery automatically. Furthermore, the module supports both send/receive and fetch/write communication models.

The onboard 48 KB buffer stores telegrams during peak network traffic. The backup battery preserves configuration data and connection tables during power loss. Additionally, the AUI interface requires an external MAU transceiver (e.g., Siemens 6GK1900-0AA00). You can connect this module to twisted pair, thick coax, or fiber optic cabling through the transceiver.

Installation and Configuration Steps

First, insert the Siemens 6ES5526-3LG01 into any S5 rack slot except the far left. Next, connect an external 24V DC supply to the dedicated terminals. Then, attach your AUI transceiver cable to the 15-pin SUB-D port. Finally, assign the station address using the configuration software.

You must terminate the Ethernet cable properly at both network ends. The module does not include an integrated hub or switch. Always use shielded AUI cables for runs longer than 5 meters. Furthermore, keep the transceiver within 50 meters of the module.

This communications processor excels at integrating S5 PLCs into plant-wide networks. It enables data exchange with SIMATIC S7 controllers using TCP/IP gateways. You can also connect to SCADA systems for centralized monitoring and control. The CP526 supports up to 240 bytes of user data per telegram efficiently.