Mitsubishi Electric MELSEC-L Series - Appendix 5.2; Loopback Test

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Appendix 5.2 Loopback test
This section describes the loopback test.
(1) Performing a test using a programming tool
This test is to check whether the initial process for each module has been completed. The test is executed on the
network of stations connected to the programming tool, and loopback test messages are sent sequentially to
each E71
*1
on the network and in the station number range specified for the loopback test request designation.
*1 Because the QJ71E71-100 of function version A and QnA/A series modules do not have a function for responding to this
request, the test results cannot be checked.
(a) Applications
The test can be executed only by specifying the network number for the test and target station number range.
For the E71-connected station subjected to the loopback test, do not specify the MELSOFT application transmission port
(UDP/IP) as a valid port for the password check. The loopback test cannot be executed.
Programming
tool
E71 E71 E71 E71
E71 E71 E71 E71
E71
(Stations connected
to the programming tool)
Network No.1
Station No.1
Station No.2
Station No.3
Station No.4
Station No.5
Station No.6
Station No.7
Station No.8
Station No.9
The loopback test is executed
from the station No.1 through
the station No.5 on the network
No.1.