Input/Output Unit with Isolator (Model SA4700-1021IMC)


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.

  • Supervision of one or more normally open contacts
  • Compliant with EN54-17 & 18
  • Fitted with a bi-directional short-circuit isolator
Min Loop in Operating Voltage 17V DC
Max Loop Operating Voltage 35V DC
Power-Up Surge Current 900uA
Quiescent 500uA
Maximum Cable Resistance 50 Ohm
Maximum Continuous Current 1A
Operating Temperature –40°C to +70°C
Humidity (no condensation) 0–95% RH
IP rating 54
Dimensions of Input/Output Unit (surface mount) 60 x 150 x 90mm
Weight 244g

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