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MELSEC-Q
11 TROUBLESHOOTING
11.5 Conducting PING Test to Check QJ71MT91 Connection
This section explains how to conduct a PING test in the QJ71MT91.
Method Reference
Section
From GX Configurator-MB
Section 11.5.1
From sequence program
Section 11.5.2
(1) PING test
(a) A PING test checks whether the other QJ71MT91 or MODBUS
R
/CP device
exists or not on Ethernet (same subnet address) where the QJ71MT91 is
connected, or if a target device (personal computer) having the specified IP
address exists or not.
(b) Perform a PING test to check the following.
1) Whether the QJ71MT91 is correctly connected to the other device on the
line.
2) Whether the basic parameter setting of the QJ71MT91 is correct.
(2) Buffer memory addresses used for PING test
The following buffer memory addresses are used for a PING test.
Address
Parameter Name
Setting
Setting Range
Default
0FE0
H
(4064)
Communication time check
Specify the waiting time for
completion of the PING test.
Set time = set value 500ms
2 to 60
2
0FE1
H
(4065)
Transmission count
Specify the number of
transmissions.
1 to 10
4
0FE2
H
to 0FE3
H
(4066 to 4067)
IP address
Specify the IP address of the
PING test target device.
Refer to *1
00000000
H
0FE4
H
(4068)
Execution result
• The execution result of the
PING test is stored.
• When completed with an
error, the error code is stored.
(Refer to Section 11.3.3)
0000
H
: Normal completion
0001
H
to : Error completion
(Error code)
0000
H
0FE5
H
(4069)
Total packet
transmission count
0FE6
H
(4070)
Success count
0FE7
H
(4071)
PING test
execution
results
Failure count
The total packet transmission
count, success count and
failure count for the PING test
execution are stored.
*1: Set the value that satisfies the following conditions.
Condition 1: The IP address class is any of A, B and C.
Condition 2: The host address bits are not all "0" or all "1".