Speed monitor, 1-channel, operating voltage 20,250 VAC / 20,250 VDC, monitoring of limit values and ranges for overshoot and undershoot, working range 0.06...600,000 min-1, connection of sensors according to EN 60947-5-6 (NAMUR) as well as 3-wire sensors and external voltage sources, step output, parameterization via PC (FDT/DTM), front-side buttons and HART, ring buffer for 8000 measured values, display, all-round galvanic isolation, input protected against reverse polarity, TR CU