Siemens 6ES7972-0DA00-0AA0 SIMATIC DP RS485 Terminating Resistor PROFIBUS MPI PLC Accessory

The Siemens 6ES7972-0DA00-0AA0 is a SIMATIC DP RS485 terminating resistor for closing PROFIBUS or MPI network segments, powered from a 24 VDC bus supply within a 20.4-28.8 V range and drawing 30 mA typical. It supports transmission rates up to 12 Mbit/s, carries an IP20 enclosure rated for 0 to 60 degrees C operation, and weighs 95 g.

Technical Specifications

Selection Notes

This terminating resistor closes the RS485 bus electrically at the physical end of a PROFIBUS or MPI segment; installing one only at each of the two segment ends, not on every station, keeps reflections and signal levels within spec at the full 12 Mbit/s rate. Match its 24 VDC bus-supply need against the segment design when using unpowered stations, since active bus termination on PROFIBUS/MPI needs its own 24 V feed unlike a passive terminator.

Applications

Installed at the electrical ends of a PROFIBUS DP or MPI RS485 segment to prevent signal reflections on multidrop networks connecting SIMATIC controllers, HMIs, and field devices.