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MDS iNET Series Reference Manual
141
A.4
MODBUS to MODBUS TCP Server Protocol
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 A-11.
Figure A-11. PLC User ID Example
MODBUS/TCP Server Configuration
Perform the following procedure to configure the
MODBUS/TCP SERVER
IP protocol settings:
1. Press
A
to select the listening port for the MODBUS/TCP server. See Figure A-12. The default is port
502
. Then press
N
to continue.
30H
Target node responded with
Remote station host is
not there, disconnected, or shutdown
.
D0H
Caused by one of the following:
•
No IP address configured for the network or
ENI not configured for Node Address used
•
Bad command: unsolicited message error
•
Bad address: unsolicited message error
•
No privilege: unsolicited message error
Table A-2. iNET/ENI Error Codes (Continued)
Error Code
Description of Error Condition
PLC
User ID: 23
iNET Remote
IP Address: 192.158.16.23
Summary of Contents for MDS iNET Series
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