Honeywell HC900 - Table 4-4 DI;DO Address Map (V2.4 and Higher, up to 32-Channel)

Modbus/TCP & Modbus RTU Function Codes
Function Code 01 – Read Digital Output Status
Revision 13 HC900 Process Controller Communications User Guide 21
April 2017
Digital I/O Channel to Address Mapping
If you have any 32-channel DI/DO modules or if you have firmware version 2.4 or higher you must use the
newer maps in Table 4-4 and Table 4-5. However, use the older maps in Table 4-6 and Table 4-7 if:
 Your controller is firmware version 2.3 or earlier or
 You have already mapped out 16-channel DI/DO, have no 32-channel DI/DO modules, and don’t
want to change to the newer map.
Note: Up to 16 slots are accommodated in the protocol even though the largest rack available supports 12
slots.
Each DI/DO consumes 1 Modbus bit address.
Decimal addressing is typically non-zero based for DI/DO access (1-based), applicable to coil or register
address.
Table 4-4 DI/DO Address Map (v2.4 and higher, up to 32-channel)
Rack
Channels
Coil number/register number
Modbus Hex
Address Range
1*
1 - 512
2001 – 2512
7D0 – 9CF
2
513 – 1024
2513 – 3024
9D0 – BCF
3
1025 – 1536
3025 – 3536
BD0 – DCF
4
1537 - 2048
3537 – 4048
DD0 – FCF
5
2049 - 2560
4049 - 4560
FD0 – 11CF
6
2561 – 3072
4561 - 5072
11D0 – 13CF
7
3073 - 3584
5073 - 5584
13D0 – 15CF
8
3583 - 4096
5585 - 6096
15D0 – 17CF
9
4097 - 4608
6097 – 6608
17D0 – 19CF
10
4609 - 5120
6609 – 7120
19D0 – 1BCF
11
5121 – 5632
7121 - 7632
1BD0 – 1DCF
12
5633 - 6144
7633 - 8144
1DD0 – 1FCF
*See Table 4-5 for detailed map of Rack #1
The coil (register) number for a DI/DO is based on the DI/DO’s position in the card cage. It is determined
from the formula:
Coil (register) Number = [(Rack-1)*512] + [(Slot-1)*32] + channel in module + 2000
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)*512] + [(10-1)*32] + 2 + 2000 = 3314
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.