The new DA101S safe standstill monitor safety relay from ifm electronic is designed for use in machinery safety control systems up to and including Performance Level e (PLe) according to EN ISO 13849-1 and Safety Integrity Level (SIL) Claim Limit 3 according to IEC 62061 (EN 62061).
Equipped with two volt-free safety relay outputs, the DA101S has a slim 25 mm housing and features a solid-state PNP feedback output as well as LED status indicators for the inputs and outputs. Two overlapping input signals are compared and evaluated, ideally from inductive sensors. These take their power directly from the zero-speed relay.
As true zero motion is difficult or impossible to verify, the DA101S is set by the user to detect a low frequency and switch when the detected pulse rate drops below the preset value. This will vary according to the pick-up arrangement and machine constraints, so one of four frequencies (0,2, 0,5, 1 or 2 Hz) can be selected using a hard-wired link. This link cannot be changed during operation without the unit switching into the safe state. The DA101S is designed for panel-mounting on a DIN rail and requires a 24 V DC supply.
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