Siemens 6ES5430-8MC11 Digital Input Output Module

Siemens 6ES5430-8MC11 is a SIMATIC S5 430 digital input module that provides four isolated inputs for 115 V AC/DC signals. Designed for use with S5-90U, S5-95U, and S5-100U controllers, it also supports ET 100U and ET 200U I/O configurations as part of legacy automation setups. Each input channel is galvanically isolated from the logic and from other channels, enabling safe interfacing to higher‑voltage field devices while protecting the CPU from transients. The module accepts four discrete digital inputs and is identified by the 6ES5430-8MC11 part number, a standard option in the 430 family used to convert sensor or switch closures into logic signals for the PLC. Typical applications include reading digital sensors, pushbuttons, limit switches, and other binary field signals in retrofitted or maintained S5 installations where 115 V signaling is required. For successful replacement or retrofit, verify compatibility with the specific S5 CPU and I/O bus configuration in the control cabinet, ensuring the 430 series backplane interface matches the existing hardware.