Mitsubishi Electric Melsec WS Series, User Manual

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MELSEC-WS
Troubleshooting
133
9.3 When data cannot be exchanged in auto update
mode
Troubleshooting
when data cannot be exchanged
in auto update mode
*1,*2
*1 For details of the sample program, refer to Section 8.3.
*2 For troubleshooting of the QJ71E71-100, refer to the Q Corresponding Ethernet
Interface Module User’s Manual (Basic).
Is the Open complete
signal (M0) on?
YES
NO
Check if data has been received
in auto update mode
from the WS0-GETH.
YES
Check if the response
command is correct.
NO
Check the network totally including the
communication path between the WS0-
GETH and the QJ71E71-100, a noise, and
installation status.
NO
Is a response returned?
- Check if the WS0-GETH is configured as a
master module.
- Check if the IP address and the port number
for the WS0-GETH are correct.
YES
Execute a PING test from the
QJ71E71-100 to the WS0-GETH.
No responses (including error responses) from the WS0-GETH
- Check if the auto update mode has been configured for the
WS0-GETH.
- Check the network totally including the communication path
between the WS0-GETH and the QJ71E71-100, a noise,
and installation status.
Was the expected
value read?
NO
(The value was
added in C32.)
Check if the response data are correctly verified in the verification
processing.
(Check that the data have been sorted in Little Endian format.)
NO
- Check if the Update Dataset checkboxes are correctly
selected.
- Check if the MELSEC-WS CPU module is in Run state.
YES
End
YES
(M510 is on.)
NO
(M511 is on.) Check the code of an error occurred by executing the BUFRCV
instruction and eliminate the error.
(Eliminate the error, referring to the error code stored in D2.)
Check if the connection
has been opened.
YES
(The value was
added in C31.)
Was the
BUFRCV instruction
executed? (Was the value
added in C20?)
Was the
BUFRCV instruction
normally completed?
(Is M510 on?)
Was the
auto update control
response command received?
(Was the value added
in C31?)
Figure 74:
Troubleshooting
flowchart when data
cannot be exchanged in
auto update mode