Hitachi WJ200-001S Instruction Manual page 551

Ver.3− − − − 42
The value of internal register number 120Fh(A013), that is linked to external register, is read out.
If you create a mapping like above, access to low order side of register number 1219 (A021) is forbidden.
Because 1218h belongs to A021(High), 1218h is used for mapping function. Thus, you are forbidden to use
1218h and 1219h directly as A021. Please refer to the below example.
When an error occurs when reading out
Query:
No
1 Slave address
2 Function code
3 Register start address (high order)
4 Register start address (low order)
5 Number of holding registers (high order)
6 Number of holding registers low order)
7 CRC-16 (high order)
8 CRC-16 (low order)
Response:
No
1 Slave address
2 Function code
3 Exception code
4 CRC-16 (high order)
5 CRC-16 (low order)
Exception code 31 and 32 represent access error of overlapping register.(Mapping Error)
Field Name
Field Name Example
Exam
ple
(Hex)
01
03
12
18
00
01
01
75
(Hex)
01
83
32
C0
E5
Register address value
= Register
Number - 1
One register