Array electronic SH-300 User Manual

SH-300 User’s Manual Connection with PLC
Page 87 of 103
6.2.3. Here is an example of displaying and setting Register R1088
According to “the list of corresponding relationship between the address type and function
codes in Modbus Protocol” the address type of reading and writing holding register is “4X” ,The
holding register address is in the range of R0-R3839. Modbus address is in the range of 0-3839. the
corresponding Modbus data address of register R1088 is 1088.
When SH-300 read holding register the data format to be send from SH-300 and responded by
PLC is shown as following.
Query message
Response message
Field Name
Example(Hex)
Field Name
Example(Hex)
Device address
-
Device address
-
Function code
04
Function code
04
Register starting address Hi
04
The count of return bytes
02
Register starting address Lo
40
Data Hi (Register R1088)
-
No. of registers Hi
00
Data Lo (Register R1088)
-
No. of registers Lo
01
CRC Lo
-
CRC Lo
-
CRC Hi
-
CRC Hi
-
When SH-300 write holding register the data format to be send from SH-300 is shown as
following.
Query message
Field Name
Example (Hex)
Device address
11
Function code
06
Register address Hi
00
Register address Lo
01
Set data Hi
00
Set data Lo
03
CRC Lo
-
CRC Hi
-
Response :The normal response is an echo of the query, returned after the register contents
have been written.
Note:
1. If the communication parameter is not correct. SH-300 will not communicate with PLC
normally.
2. If the data address you input is not in the range that is specified by user manual. SH-300 will
not communicate with PLC normally.
3. If PLC don’t support the address type you select (For example Delta PLC don’t support “3X”).
SH-300 will not communicate with PLC normally.

Array electronic SH-300 Specifications

General

Brand	Array electronic
Model	SH-300
Category	Controller
Language	English