9 data exchange example—modbus tcp – B&B Electronics GW-7553 - Manual User Manual

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z DA: Device Address-0x01

z FC: Function Code-0x02:read DI

z SA(Hi): Start Address(Hi byte)-0x00

z SA(Lo): Start Address(Lo byte)-0x00

z NO(Hi): No. Of points(Hi byte)-0x00

z NO(Lo): No. Of points (Lo byte)-0x10

z BC: Byte Count-0x02

4.9 Data exchange example—Modbus TCP

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).

Step 2: Connect GW-7553 and PC by Figure 46.

Figure 46 Wiring diagram between PC and GW-7553

GW-7553 PROFIBUS/Modbus TCP Gateway User Manual (Version 1.00, Dec/2008) PAGE: 49