Siemens 6ES5318-8MB12 Simatic S5 PLC Interface Module

Siemens 6ES5318-8MB12 (IM318-B) is an interface slave module for SIMATIC S5 systems that links ET200U remote I/O to a Profibus-DP network. As the IM318-B interface, it serves as the slave interface enabling ET200U modules to be controlled on a Profibus-DP bus within an S5 installation. The 6ES5318-8MB12 variant is the DP-capable IM318-B used in older SIMATIC S5 configurations; Siemens lists the product as discontinued, with listings noting it was deleted without replacement. Typical use cases include retrofitting legacy S5 lines with ET200U I/O or integrating S5-based systems into Profibus-DP networks for data exchange and remote I/O management.