Siemens 6ES5 090-8ME11 is an interface module (Interface Module)

for connecting and expanding programmable logic controllers (PLC). The SIMATIC S5-90U series is used for S5-100U peripheral modules. This communication module provides communication between different devices in industrial automation systems and supports 24V DC voltage and 9V bus supply. This module is known as part of the Siemens SIMATIC S5 product family, which is used in older industrial automation systems. Given that this product is no longer produced and there is no replacement for it, it may be difficult to find it on the market new and unused, but it can be obtained from second-hand parts dealers.