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Differences between IAC 400 and IAC 420 controllers


What are the differences between the IAC 400 and the IAC 420 controllers?

Product Line

Field Devices, Other, Satchwell MicroNet, Satchwell Sigma



  • IAC 400
  • IAC 420


The IAC 400 controller is obsolete and its replacement is the IAC420.


Hardware differences;

The IAC 400 has 3 Temperature, 2 Analogue and 1 Digital input, where as the IAC 420 has 6 Universal inputs.

Communications differences;

The IAC 400 controller uses terminal 3 to earth the communications cable screening, on the IAC 420 the screening must be connected to a good earth and not terminal 3.

Tables and offsets;

Because the IAC 420 has different inputs that tables and offsets are changed, please review IAC Controllers - Tables and Offsets.

IAC 400 Wiring details. For the full data sheet please click HERE.


IAC 420 Wiring details. For the full data sheet please click HERE.

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