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Holding Registers (Analogue Outputs)
Register Name
Address
Modicon
Address
Details
Cooling Mode Setpoint High Limit
34
40035
Temperature in ºC (default 30ºC).
Cooling Mode Setpoint Low Limit
35
40036
Temperature in ºC (default 16ºC).
Heating Mode Setpoint High Limit
36
40037
Temperature in ºC (default 30ºC).
Heating Mode Setpoint Low Limit
37
40038
Temperature in ºC (default 16ºC).
--- Occupancy Mode ---
In Occupancy Cooling Setpoint
38 40039
Temperature in ºC (default 23ºC).
Value must be at least 2ºC higher than the In
Occupancy Heating Setpoint.
--- Occupancy Mode ---
In Occupancy Heating Setpoint
39 40040
Temperature in ºC (default 21ºC).
Value must be at least 2ºC lower than the In
Occupancy Heating Setpoint.
--- Occupancy Mode ---
Staff In Cooling Setpoint
40 40041
Temperature in ºC (default 24ºC).
Value must be at least 2ºC higher than the Staff In
Heating Setpoint.
--- Occupancy Mode ---
Staff In Heating Setpoint
41 40042
Temperature in ºC (default 18ºC).
Value must be at least 2ºC lower than the Staff In
Heating Setpoint.
--- Occupancy Mode ---
Unoccupied Cooling Setpoint
42 40043
Temperature in ºC (default 26ºC).
Value must be at least 2ºC higher than the
Unoccupied Heating Setpoint.
--- Occupancy Mode ---
Unoccupied Heating Setpoint
43 40044
Temperature in ºC (default 16ºC).
Value must be at least 2ºC lower than the
Unoccupied Heating Setpoint.
Deadband Cooling Setpoint
44
40045
Temperature in ºC (default 23ºC)
Deadband Heating Setpoint
45
40046
Temperature in ºC (default 19ºC)
Auto Mode Timeout
46
40047
Value in seconds (default 300 seconds).
The length of time before Auto Mode ends and the
unit switches to FAN mode.
Relay Manual Override Start/Stop
51
40052
Write value 1 to allow relay outputs to be overridden
using Modbus registers 52 – 55.
Write value 0 to end the manual override and return
relays to their normal operating state.
Note the manual override will timeout after 20
minutes and the relays will return to their normal
operating state.
Relay 1 Override State
(ON/OFF)
52 40053
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.
Relay 2 Override State
(HEATING)
53 40054
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.
Relay 3 Override State
(COOLING)
54 40055
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.
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