Honeywell HC900 - Manual (Page 34)

26 HC900 Hybrid Controller Communications User Guide Revision 10
12/07
Table 4-6 DI/DO Address Map (Firmware version 2.3 and earlier, 16 channels max)
Rack Channels Coil number/
Register number
Modbus Hex
Address Range
1* 1 - 256 1 – 256 0 - FF
2 257 - 512 257 - 512 100 - 1FF
3 513 - 768 513 – 768 200 - 2FF
4 769 - 1024 769 – 1024 300 - 3FF
5 1025 - 1280 1025 - 1280 400 - 4FF
*See Table 4-7 for detailed addresses of Rack #1
The coil (register) number for a digital I/O is based on the DI/DO’s position in the card cage. It is
determined from the formula:
Coil (register) Number = [(Rack-1)*256] + [(Slot-1)*16] + channel in module
Example: To monitor a coil (register) located in the 2nd channel of slot 10 of rack 3, the Modbus coil
(register) number is:
[(3-1)*256] + [(10-1)*16] + 2 = 658
Some third party software packages will require the 1-based coil/register number to be used for the address
while others will require the 0-based hex address.
Table 4-7 Rack #1 DI/DO address map (v2.3 and earlier, up to 16-channel)
Slot 1 Slot 2 Slot 3 Slot 4
CH# Coil/
register
Addr.
Hex
CH# Coil/
register
Addr.
Hex
CH# Coil/
register
Addr.
Hex
CH# Coil/
register
Addr.
Hex
16 16 0F 16 32 1F 16 48 2F 16 64 3F
15 15 0E 15 31 1E 15 47 2E 15 63 3E
14 14 0D 14 30 1D 14 46 2D 14 62 3D
13 13 0C 13 29 1C 13 45 2C 13 61 3C
12 12 0B 12 28 1B 12 44 2B 12 60 3B
11 11 0A 11 27 1A 11 43 2A 11 59 3A
10 10 9 10 26 19 10 42 29 10 58 39
9 9 8 9 25 18 9 41 28 9 57 38
8 8 7 8 24 17 8 40 27 8 56 37
7 7 6 7 23 16 7 39 26 7 55 36
6 6 5 6 22 15 6 38 25 6 54 35
5 5 4 5 21 14 5 37 24 5 53 34
4 4 3 4 20 13 4 36 23 4 52 33
3 3 2 3 19 12 3 35 22 3 51 32
2 2 1 2 18 11 2 34 21 2 50 31
1 1 0 1 17 10 1 33 20 1 49 30