The transmitter is used in conjunction with the Ringline contact status monitoring and distributed emergency stopping system. When used as part of the emergency stop network both channels of a transmitter 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. indication only), a single channel may be used.

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