Modbus Communication; Module Execution Process; Modbus / Hart Mapping Table - ICP DAS USA HRT-710 User Manual

4. Modbus Communication

4.1 Module Execution Process

When the HRT-710 module is started, it will enter the ―Initial‖ mode
first and then enter the ―Operation‖ mode.
(1) When HRT-710 runs in ―Initial‖ mode, it will execute all initial command
and the ―RUN‖ led will flash.
(2) When HRT-710 runs in ―Operation‖ mode, it will execute all polling
command automatically and the ―RUN‖ led will be always on.

4.3 Modbus / HART Mapping Table

Users can access the HART device by using these Modbus address
defined by HRT-710 module. These Modbus address can be divided into
two parts as below.
(1) Input Data Area (FC04)
(2) Output Data Area (FC06, 16)
[ Table 5: Modbus / HART Mapping Table ]
I
MB_Addr
N
(HEX)
P
U
0~1F3
T
D
1F4
A
1F4
T
1F5
A
1F5
1F6
1F6
A
1F7~1F9
R
E
A
1FA~200
201~207
208~20E
20F~215
HRT-710 User Manual (Version 1.24, June/2015)
MB_Addr
(Decimal)
[ User CMD Data ]
―User CMD― data
0~499
[ Module State Data ]
500L Module state machine
500H Module request command count
501L Module receive command count
501H Module receive error command count
502L Module error status
502H Module error command index
503~505 Reserved
[ Default CMD(0) Data ]
―Default CMD(0)‖ input data of ―Module 0‖
506~512
―Default CMD(0)‖ input data of ―Module 1‖
513~519
―Default CMD(0)‖ input data of ―Module 2‖
520~526
―Default CMD(0)‖ input data of ―Module 3‖
527~533
Description
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