Siemens 6ES5488-3LA31 Interface Module For PROFIBUS DP

Siemens 6ES5488-3LA31 is a SIMATIC S5 digital I/O module in the 488 I/O family, delivering 5 digital inputs and 3 digital outputs for 24 V DC signals. Designed to plug into the SIMATIC S5 I/O backplane, it expands a legacy controller’s sensing and actuation capabilities by providing a compact block of DI and DO channels. The 6ES5488-3LA31 variant is documented in Siemens literature as part of the 488 I/O line, confirming its 5 DI / 3 DO configuration and its role as a digital I/O module rather than a standalone fieldbus interface. Typical applications include retrofitting or upgrading older machines, extending control panels, and integrating additional digital I/O on systems where SIMATIC S5 hardware remains in operation. With 24 V DC logic compatibility, the module is suited for common automation tasks such as reading limit switches, proximity sensors, and pushbuttons while driving simple actuators or relays through its three outputs, enabling reliable, straightforward expansion of legacy automation architectures.