Communication Test - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION

4.8.4 Communication test

GX Developer
Host
1N 1 1N 2
S S
Network No. 1
1N 4 1N 3
S S
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This test checks whether or not data communication can normally be performed
between the host and a destination station (specified with network number and station
number). Especially when the destination has another network number, the relay
network and station numbers are displayed. So, make sure that the routing parameters
are properly set.
In the following system, when the communication test is conducted to 4Ns6 of network
number 4 by GX Developer connected to 1Ns1 of network number 1, the monitor
screen shown below is displayed to verify that normal communication can be
performed with the contents of the routing parameter settings.
2N 1 2N
S
1M 5 2M 2
Network No. 2
P P
2N 6 2N
S
REMARKS
If the routing parameters are not properly set, the message "Cannot communicate
with PLC" is displayed and the communication result is not displayed.
3
S
2N 5 3M 1
P
S
4
S
3N 3
S
Network No. 3
3N 5 3N 4
S S
Return path from the
destination to the host
MELSEC-Q
4M 1 4N
P
3N 2
4N 5 Network No. 4
S
S
4N 6 4N
S
Destination
Forward path from the host
to the destination
Station numbers of
relay stations
5 is the station No.
of network No. 1 side
2 is the station No.
of network No. 2 side
2 4N 3
S S
4
S
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