Omron sysmac NA Series User Manual page 69

Symptom
Monitor values are not
displayed normally on
the Variable Monitor.
Value cannot be writ-
ten to a variable.
Force refreshing can-
not be set.
Response to operation
is poor.
System does not oper-
ated as expected.
NA-series Ladder Monitor User's Manual (V124)
Cause
A communications error occurred so the
data cannot be acquired.
The variable information is being
acquired.
An unsupported variable has been set.
The project was updated and a variable
no longer exists.
A communications error occurred.
The variable information is being
acquired.
A constant was set for the attribute of a
variable.
The project was updated and a variable
no longer exists.
A communications error occurred.
The variable information is being
acquired.
Variable for which force refreshing cannot
be set has been specified.
The project was updated and a variable
no longer exists.
There are too many circuits.
The communications load is too high.
The controller load is too high.
There are differences between the ladder
programs of the HMI and controller.
6 Troubleshooting
Correction
Check the connections between the HMI
and the controller.
Wait until the acquisition of the variable
information is complete.
Refer to 2-2-11 Monitoring Variable Val-
ues on page 2-16 for the details on unsup-
ported variables.
Update the data in the project to the latest
state and then download the ladder pro-
gram to the HMI.
Check the connections between the HMI
and the controller.
Wait until the acquisition of the variable
information is complete.
Remove the constant.
Update the data in the project to the latest
state and then download the ladder pro-
gram to the HMI.
Check the connections between the HMI
and the controller.
Wait until the acquisition of the variable
information is complete.
Check whether or not variable for which
force refreshing can be set.
Update the data in the project to the latest
state and then download the ladder pro-
gram to the HMI.
Split up the section of the ladder program.
Reducing the number of functions and
function blocks in the section will
decrease the load effectively.
Using a variable for an element number of
an array will increase the load. Split the
structures to make the size of one variable
smaller. It would be required especially
when using of an array of structures that
are inclined to have high load.
If there are multiple HMI or Sysmac Studio
connections on the controller, the
response to communications will deterio-
rate. Reduce the number of simultaneous
connections.
Download the ladder program to the HMI
after updating the data in the project to the
latest.
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