GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual
(Version 1.60, May/2017)
PAGE: 40
Modbus type is slave (please refer section 3.1 Profibus data exchange ).
4.6.1 Input data area
The maximum length of input data is 132 bytes. Before arrange the input
module, the user must arrange and configure the system setting module. The
user can get data and control I/O of Modbus slave device or get DI/DO/AI/AO
of the GW-7552-B / GW-7552-M by read input module.
Table 13 Input data area
Module
Byte
Data
Description
System setting module
(diagnostic message)
0
The number of Diagnostic messages
1
00or03
Fixed value(The value is 00 when byte 0 is
0,The value is 03 when byte 0 is not 0)
2
Message(refer table 12)
3
Description(refer table 12)
Input module
4~131
Data Receive data
EX. Input data area in byte 0~byte3 information is “04 03 02 FE”,
“04” means there are 4 diagnostic messages,
“02” means “Module 2 error!”
“FE” means ”Response Message Timeout!”
4.6.2 Output data area and communication command
The maximum length of output data is 131 bytes. Before arrange the output
module, the user must arrange and configure the system setting module. The
first three bytes belong to communication commands, as shown in
table 14.
The
user can change data and I/O state of Modbus slave device or DI/DO/AI/AO
data of GW-7552-B / GW-7552-M by modify data of output module.
Table 14 Output data area
Module Byte
Bit Position
Description
7
6
5
4
3
2
1
0
System
setting
module
0
Data output command
1
- - - - - - SM DC Control bit
2
Output module select