Siemens 6ES5488-3LA31 I/O Module | 32/32 Digital S5-135U

Technical Overview

The Siemens 6ES5488-3LA31 is a high-density digital input/output module for the SIMATIC S5-135U programmable controller series. This unit combines 32 digital input channels and 32 digital output channels in a single slot. It interfaces directly with field devices using 24 VDC signals. This integrated design saves valuable chassis space while simplifying system wiring. The module includes a 48-pin front connector for easy field wiring access.

Technical Specifications

Parameter	Specification
Manufacturer	Siemens
Model Number	6ES5488-3LA31
Product Type	Digital Input/Output Module
System Compatibility	SIMATIC S5-135U
Input Channels	32 (24 VDC)
Output Channels	32 (24 VDC, 0.5 A per channel)
Input Voltage	24 VDC
Output Voltage	24 VDC
Output Current	0.5 A per channel (resistive load)
Isolation	Optical (channels to backplane)
Input Delay	2 ms (typical)
Output Switching Time	0.2 ms (turn-on), 0.5 ms (turn-off)
Power Consumption	5 W (from backplane)
Terminal Type	48-pin front connector
Dimensions	233 x 37 x 268 mm
Weight	0.45 kg
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C
Humidity	5% to 95% RH (non-condensing)
Short-Circuit Protection	Yes (outputs)
Certifications	CE, UL, CSA
Country of Origin	Germany

Key Features

High-Density 64-Point Design – The module provides 32 inputs and 32 outputs in a single slot. It effectively doubles I/O density compared to standard modules.

Optical Isolation – The 1500V isolation protects the CPU from field-side electrical noise and voltage transients.

Short-Circuit Protected Outputs – The module safeguards outputs from overload conditions, ensuring reliable operation.

Fast Response Times – The 2 ms input delay and sub-millisecond output switching support high-speed control loops.

Removable Front Connector – The 48-pin connector simplifies field wiring and accelerates module replacement.

Applications

The Siemens 6ES5488-3LA31 excels in discrete manufacturing, packaging systems, and machine control. It suits space-constrained applications requiring high I/O density.