HRW HPD0440BNMR V401 Manual 111116.doc E. & O. E. / Subject to change without notice Page 28 of 43
For the purpose of setting up the MR points, the Modbus RTU point numbers are grouped in to sets of
256 points (0…255). Each set of 256 points is referred to as a
Table
(AddHi) and each point within a
table is referred to as
Row
(AddLo).
Although there is some difference between individual manufacturers in the way that they refer to points
within devices, the Modbus RTU addressing in the background of their devices is similar, following the
Modicon Modbus RTU (offset 1) or J-Bus (offset 0) addressing structure.
A conversion of Modbus RTU addresses to HPD…MR Table & Row is as follows (based on Modicon
Function 03 / 40001…):
MODBUS Addr Range
HPE-P1MOD
Table
#
Row
#
40001…
40256
0
0… 255
40257… 40512
1
0…
255
40513…
40768
2
0… 255
40769… 41024
3
0…
255
41025…
41280
4
0… 255
41281… 41536
5
0…
255
41537…
41792
6
0… 255
41793… 42048
7
0…
255
42049…
42304
8
0… 255
42305… 42560
9
0…
255
42561…
42816
10
0… 255
42817… 43072
11
0…
255
43073…
43328
12
0… 255
43329… 43584
13
0…
255
Etc…
String entries for the Function types are a number of programming values that cover the possible
Modbus register types and their possible data formats including integer (1 Word/2 bytes), long integer
(2 Words), IEEE floating point (2 Words) and signed integers:
HPD Point Type
Programming
Value
Modbus Function / Format
N/A 0 Not
Used
Read/Write Input Coil (RIC)
1
Function 01 (F01)
Read Input Discrete (RID)
2
Function 02 (F02)
Read/Write Holding Register
(RHR)
3
Function 03 (F03)
Read Input Register (RIR)
4
Function 04 (F04)
RHR - IEEE 754 (RHE +
RHEP)
5
F03 2 Word (IEEE floating point)
RIR - IEEE 754 (RIE + RIEP)
6
F04 2 Word (IEEE floating point)
RHR 2 Word Pair
(RHR+RHRP)
7
F03 2 Word (integer)
RIR 2 Word Pair (RIR+RIRP)
8
F04 2 Word (integer)
RHR Signed Integer (RHRS)
9
F03 -32767…+32767
RIR Signed Integer (RIRS)
10
F04 -32767…+32767