Siemens 6ES5461-8MA11 Programmable Logic Controller Module

Siemens 6ES5461-8MA11 is a two-channel comparator module in the SIMATIC S5 family (461), designed to plug into S5-90U/95U/100U controllers and ET 100U/ET 200U units. It provides two galvanically isolated input channels that accept either 0.5-10 V or 0.5-20 mA signals, enabling threshold comparisons within automation loops. The module measures about 6.0 in length, 2.0 in height and 4.0 in width, and weighs around 0.2 kg, making it a compact addition to standard S5 racks. Manufactured in Germany, the 6ES5461-8MA11 is used for monitoring sensor signals and triggering PLC actions when input thresholds are crossed, offering reliable isolation between analog inputs and the rest of the control system. Common applications include process sensing, level or temperature monitoring with analog sensors and logic-level triggering in legacy Siemens S5 installations. This module is compatible with Siemens SIMATIC S5 systems and is widely encountered in refurbishment catalogs and replacement parts for aging automation lines.