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12.3. Discrete
Inputs
Discrete Input Registers are read using function code 02.
Discrete Inputs (Digital Inputs)
Register Name
Address
Modicon
Address
Details
Force ON Input State
0
10001
0 = Input off (open contact)
1 = Input on (closed contact)
Force OFF Input State
1
10002
0 = Input off (open contact)
1 = Input on (closed contact)
Lock/Auto Input State
2
10003
0 = Input off (open contact)
1 = Input on (closed contact)
External Fault Input State
3
10004
0 = Input off (open contact)
1 = Input on (closed contact)
Running Status Relay State
4
10005
0 = Relay de-energised
1 = Relay energised
Heating Status Relay State
5
10006
0 = Relay de-energised
1 = Relay energised
Cooling Status Relay State
6
10007
0 = Relay de-energised
1 = Relay energised
Fault Relay State
7
10008
0 = Relay de-energised
1 = Relay energised
Comms Settings Switch State (DIP
switch 1-6)
8 10009
0 = Fixed 9600 baud, no parity (DIP Switch off)
1 = Software selectable settings (DIP Switch on)
Protocol Selection Switch State
(DIP switch 1-7)
9 10000
0 = Reserved (DIP Switch off)
1 = Modbus RTU (DIP Switch on)
Auto/Lock Mode Selection Switch
State (DIP switch 1-8)
10 10011
0 = Auto Mode selected (DIP Switch off)
1 = Lock Mode selected (DIP Switch on)
Deadband Enabled Switch State
(DIP switch 2-1)
11 10012
0 = Deadband Mode disabled (DIP Switch off)
1 = Deadband Mode enabled (DIP Switch on)
Setpoint Limiting Enabled Switch
State (DIP switch 2-2)
12 10013
0 = Setpoint Limiting disabled (DIP Switch off)
1 = Setpoint Limiting enabled (DIP Switch on)
Timeout Enabled Switch State (DIP
switch 2-3)
13 10014
0 = Timeout disabled (DIP Switch off)
1 = Timeout enabled (DIP Switch on)
Analogue Input Type Selection
Switch State (DIP switch 2-4)
14 10015
0 = Voltage input type selected (DIP Switch off)
1 = Resistance input type selected (DIP Switch on)
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