MDS MDS iNET 900 Instrukcja Użytkownika Pobierz pdf (Strona 15)

MDS 05-4131A01, Rev. A MDS iNET ENI Supplement 15

3. MODBUS to MODBUS

TCP SERVER PROTOCOL

3.1 Introduction

NOTE: This section assumes you have an understanding of Ethernet

networking, TCP/IP, and Modbus serial protocols. For more

information, refer to the Modbus-IDA Organization web site:

http://www.modbus.org.

The iNET implementation of the MODBUS to MODBUS TCP server

protocol is limited to act as one of the following:

• A Modbus/TCP client on the LAN port

• A Modbus ASCII server on the serial port

• A Modbus RTU server (user configurable) on the serial port

NOTE: Modbus/TCP functionality is only available on the COM2 port

of the iNET/ENI transceiver.

NOTE: All requests are sent using TCP on registered port 502.

NOTE: The PLC’s User ID must match the last octet of the iNET

Remote’s IP address. See Figure 3-1.

Figure 3-1 PLC User ID Example

PLC

User ID: 23

NET Remote

P Address: 192.158.16.23

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MDS MDS iNET 900 Instrukcja Użytkownika Strona 15