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Holding Registers (Analogue Outputs)
Register Name
Address
Modicon
Address
Details
Relay 4 Override State
(FAULT)
55 40056
If the relay manual override has been enabled using
Modbus register 51 then writing a value 0 to this
register will de-energise the relay.
Writing value 1 will energise the relay.
Auto Mode Timeout Override
56
40057
If the Auto Mode input has been triggered the unit will
run in Auto mode for a configurable length of time.
This register can be used to temporarily override this
timeout value.
e.g. Trigger Auto Mode and wait for the unit to switch
to Auto mode. Now write value 60 to this Modbus
register. Now after 60 seconds the unit will leave
Auto Mode and run in Fan mode.
Heating Relay Temperature Offset
57
40058
When in Heat or Auto mode this value determines
how far the return air temperature must decrease
below the temperature setpoint for the HEATING
relay to energise.
The value is in ºC.
Cooling Relay Temperature Offset
58
40059
When in Cool or Auto mode this value determines
how far the return air temperature must increase
above the temperature setpoint for the COOLING
relay to energise.
The value is in ºC.
Relay Switching Delay
59
40060
This value determines how long the delay will be
before the ON/OFF, HEATING and COOLING relays
change state.
The value is in Seconds.
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