The IMpdp interface module connects the tightening system to the PROFIBUS DP field bus. The tightening system is then controlled by the superior control system, e.g. the PLC function. Data can simply be transferred via the I/O level. The IMpdp is inserted into the A slot of the KE350 communication unit or the CS351 Compact System. The module has a 400 byte address space on the field bus. Depending on the requirements of the tightening system, this address space can be adjusted from 16 I/16 O points (2 bytes) to 512 I/512 O points (128 bytes) as well as a 0-64-bit ID code and 0-242 bytes of data. The logical configuration of the control signals is set using the BS350 operating system.