The transmitter is used in conjunction with the Ringline contact status monitoring and distributed emergency stopping system. The 6 channels are grouped as three pairs and each pair may be programmed to any Ringline A/B address.

When used as part of the emergency stop network both channels of a pair (A&B) are used to monitor one emergency stop switch (one normally open and one normally closed contact). In this application the inputs should be connected to two independent interlocks rather than a changeover contact for increased integrity.

When monitoring non-critical functions (e.g. for indication only), the six channels may be used independently.

For intrinsically safe applications regulations require a minimum housing protection of IP55 and 500V isolation from earth for the interlocks being monitored.