The Input/Output Unit provides supervision of one or more normally open contacts connected to a single pair of cables and a set of change-over relay output contacts.
Compliant with EN54-17 & 18, it is set to return an analogue value of 4 in the event of an open or short-circuit fault and 16 during normal operation. The status of the inputs is reported by means of two input bits. The change-over contacts are operated by an output bit.
It is fitted with a bi-directional short-circuit isolator and will be unaffected by loop short circuits on either loop input or output.
|Min Loop in Operating Voltage||17V DC|
|Max Loop Operating Voltage||35V DC|
|Power-Up Surge Current||900uA|
|Maximum Cable Resistance||50 Ohm|
|Maximum Continuous Current||1A|
|Operating Temperature||–40°C to +70°C|
|Humidity (no condensation)||0–95% RH|
|Dimensions of Input/Output Unit (surface mount)||60 x 150 x 90mm|
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