ICP DAS USA GW-7553-B, Руководство пользователя

Страница: 66 / 122

GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual
(Version 1.35, May/2017)
PAGE: 66
PS:
Modbus command:
Query message
DA FC
SA
(Hi)
SA
(Lo)
NO
(Hi)
NO
(Lo)
01 02 00 00 00 10
Response message
DA FC BC DATA
01 02 02 FE DC

DA: Device Address-0x01

FC: Function Code-0x02:read DI

SA(Hi): Start Address(Hi byte)-0x00

SA(Lo): Start Address(Lo byte)-0x00

NO(Hi): No. Of points(Hi byte)-0x00

NO(Lo): No. Of points (Lo byte)-0x10

BC: Byte Count-0x02
4.10 PROFIBUS DP-V1 Data exchange example—Modbus RTU
In this example a Modbus Master device simulated by a PC program sends query
message and receives response message from a PROFIBUS Master via the GW-
7553 gateway.
In the following examples the CIF50-PB PROFIBUS Master card from Hilscher is
used. The configuration and communication is done by the program “SyCon”
provided by Hilscher.
Step 1: Copy the GSD file and assign the GW-7553 a valid station address
(Please refer to the section 4.2 GSD file).