Siemens 6ES5752-0LA52 Interface Module

This interface module connects SIMATIC S5 controllers to PROFIBUS DP networks. It acts as a master or slave device on the fieldbus. You can integrate this unit with modern Siemens S7 or third-party PLCs.

Technical Specifications

Parameter	Details
Brand	Siemens
Model	Siemens 6ES5752-0LA52
Category	Interface Module (SIMATIC S5 Series)
Dimensions (H x W x D)	250 mm x 25 mm x 210 mm
Weight	0.62 kg
Protocol	PROFIBUS DP (EN 50170)
Physical Interface	1x RS-485 (9-pin D-sub)
Data Rate Range	9.6 kbit/s to 12 Mbit/s (auto-detecting)
Bus Termination	Integrated switchable 220 Ω termination
Maximum Bus Length	100 m (12 Mbit/s) to 1200 m (9.6 kbit/s)
Number of Slaves Supported	Up to 32 (when acting as master)
Internal Buffer	8 KB dual-port RAM for data exchange
Number of Internal Components	1 CPU + 1 PROFIBUS controller + 1 buffer memory + 1 PCB
Configuration Tool	COM PROFIBUS or STEP 5
Power Supply	5 V DC from backplane only
Current Draw (5V)	300 mA typical
Built-in Energy Storage	330 µF capacitor for buffer retention
Status Indicators	5 LEDs (RUN, BUS FAULT, DIAG, TX, RX)
Operating Temperature	0°C to 60°C
Protection Features	Galvanic isolation between bus and backplane

Detailed Feature Overview

This module supports PROFIBUS DP at speeds up to 12 Mbit/s. You can configure it as either a master or slave device. The 8 KB buffer handles cyclic and acyclic data exchanges efficiently.

A 330 µF capacitor retains the buffer during brief power interruptions. Consequently, you avoid losing configuration data during brownouts. The integrated termination switch simplifies bus installation at network ends.

You will find five status LEDs on the front panel. These LEDs show bus activity, faults, diagnostics, transmission, and reception. The RS-485 interface uses a standard 9-pin D-sub connector for easy cabling.

Installation and Programming

Siemens 6ES5752-0LA52 fits any S5 rack slot except the CPU position. Use COM PROFIBUS software to assign bus parameters and slave addresses. Set the termination switch to ON only at physical bus ends.