Built into a rugged high-grade steel housing, which is in line with the SIMATIC S7 design in terms of dimensions and shape, the AddFEM meets stringent environmental requirements. It is prepared for mounting on DIN rails and for direct mounting with bolts. These installation options support both freestanding construction and installation in cabinets or wall-mounted housings.

The connecting elements are protected by a removable hood on which the connector pin assignment of the I/O signals is printed. The functions are set by means of two mode selectors and indicated by 12 LEDs. In accordance with the PLC standard, 2 x 16 LEDs are available in the display panel of the module for signaling the binary I/O signals.