Siemens 6ES5 788-8MA11 Simatic S5 Simulator I Module is a plug‑in I/O simulator for the S5-95U/S5-100U bus, designed to test and emulate digital inputs and outputs on an existing SIMATIC S5 installation. Function selection enables simulation of eight inputs via rear switch signals, and the unit includes eight LED indicators to display the corresponding output signals. It ships without a coding key, so it can be mounted in place of any digital I/O module; its dimensions are 110 mm × 45 mm × 135 mm and it weighs about 0.2 kg.
