B&B Electronics GW-7553 - Quick Start Guide - Manual (Page 8)

¾ PROFIBUS output test
--Send Command to read DI of the GW-7553
The user needs to input command (” 01 02 00 00 00 10”) in MBTCP and
click button to send Modbus command and then MBTCP
can receive response message (” 01 02 02 00 00”). In this message, the user
can know the value of DI0 & DI1 is “0” in the GW-7553.
--Send output data to write DI of the GW-7553 by the PROFIBUS Master
The user needs to set “0xFE” & “0xDC” in byte 3 & byte 4 of output data
area of PROFIBUS Master device and then set the value of the first byte from
0 to 1 to trigger the data output command.
--Send command to read DI of the GW-7553 again
Now the user can input command (” 01 02 00 00 00 10”) in MBTCP and
click button to send Modbus command again. Then
MBTCP can receive response message (” 01 02 02 FE DC”). In this message,
the user can know the value of DI0 & DI1 have changed into “0xFE” &
“0xDC” in the GW-7553, as shown in the below.
Set output data and trigger output data command
Module Byte Data type Representation Value
Output 0 Byte Hex 0x00 → 0x01
Output 1 Byte Hex 0x00
System
module
Output 2 Byte Hex 0x00
Output 3 Byte Hex 0x00→ 0xFE Output
module
Output 4 Byte Hex 0x00→ 0xDC
Send Modbus command to read DI of the GW-7553 and receive data (0xFE, 0xDC)
GW-7553 PROFIBUS/Modbus TCP Gateway Quick Start (Version 1.00, DEC/2008) PAGE：8