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(3) Precautions
(a) Files to be monitored
When monitor conditions are set, GX Developer monitors the file displayed on the screen.
Select [Online] [Read from PLC] in GX Developer and read data from the CPU module so that the file name
in the CPU module to be monitored matches the file named displayed on the screen of GX Developer.
(b) No file register setting
If the file register is monitored when there is no file register used, "FFFFH" is displayed.
(c) Device assignment
For monitor operation, device assignment in the CPU module and GX Developer must be the same.
(d) Monitoring the buffer memory of an intelligent function module
When monitoring the buffer memory of an intelligent function module, the scan time increases for the same
reason for execution of the FROM/TO instructions.
(e) Monitoring by multiple users
When multiple users are performing monitoring at the same time, pay attention to the following.
• High speed monitor can be performed by increasing 1K step per monitor file of other stations in the system
area when formatting the program memory or setting a parameter in the Boot file tab of the PLC parameter
dialog box.
Up to 15 stations can be set as the station monitor file, but the program space will be reduced.
• If the monitor condition or monitor stop condition is set, only one user can perform monitoring.
(f) Setting a monitor stop condition
A monitor stop condition can be set only in the ladder monitor.
(g) Specifying the same device as a condition
When specifying the same device as a monitor condition or monitor stop condition, set the on/off status as well.
(h) Specifying a step number as a monitor condition
If an instruction in the specified step is not executed in such cases described below, the monitor condition will
not be established.
• The specified step is skipped with the CJ, SCJ, or JMP instruction.
• The specified step is the END instruction and never be executed because the FEND instruction also exists
in the program.