Input Registers; Discrete Inputs; Coils - Procon MelcoBEMS MINI Installation Manual

BACnet APDU Timeout
BACnet APDU Retries
11.2.

Input registers

Input Registers are read using function code 04.
Note the values of all Input registers have corresponding Holding registers which can be used instead.
Register Name
Room Temperature
Fault Code (hex)
Firmware Version
Modbus Comms Counter
Fault Code (decimal)
System Type Detected
Deadband Enabled State
11.3.

Discrete Inputs

There are no Discrete Inputs for Air-To-Air systems.
11.4.

Coils

Coils are read using function code 01 and written to using either function code 05 or 15. Function code 05 is used when
writing to a single coil register, function code 15 is used for writing to multiple coil registers in the same command.
Note the values of all Coil registers have corresponding Holding registers which can be used instead.
Register Name
Drive On/Off
(Note: Holding register address 7
can also be used to change the
Drive)
Page 21 of 47
276 40277 Timeout value in ms for client requests
277 40278 Number of times to retry after timeout
Input Registers (Analogue Inputs)
Modicon
Address
Address
Temperature value in °C multiplied by 10.
0 30001
e.g. value 200 = 20°C
0x8000 = No error
0x6999 = Bad communication with indoor unit
1 30002
(Refer to indoor unit documentation for description of
other fault code values)
3 30004 MelcoBEMS MINI (A1M) firmware version
Value of a counter which increments upon every valid
5 30006 Modbus command received. Counter is reset to zero
when value exceeds 65535.
8000 = No error
6999 = Bad communication with indoor unit
8 30009
(Refer to indoor unit documentation for description of
other fault code values)
0 = ATA
9 30010
1 = ATW
0 = Deadband disabled (DIP switch 8 OFF)
10 30011
1 = Deadband enabled (DIP switch 8 ON)
Coils (Digital Outputs)
Modicon
Address
Address
0 = Drive OFF
0 00001
1 = Drive ON
Details
Details