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17 MONITORING
MELSOFT
(2) ON/OFF status
The ladder ON/OFF status is determined as follows.
OFF
ON
: Only comparison instructions which are equivalent to contacts, and SET,
RST, PLS, PLF, SFT, SFTP, MC, FF, DELTA, DELTAP instructions, which
are equivalent to coils, are supported.
(FF, DELTA, and DELTAP are QnA series instructions.)
In list mode
In the list mode, the ON and OFF states are displayed as follows.
• For bit device
The device name and monitor status are displayed under the row where the
list instruction is displayed.
OFF: [X0=OFF], ON: [X0=ON]
• For word device
The present value is displayed.
Refer to Section 17.1 for the list monitor screen.
POINTS
• The display of ON/OFF statuses and present values is maintained while
monitoring is stopped.
• The indication for the monitoring of RST instructions is the ON/OFF status of
the device being reset.
When the device to be reset is OFF
When the device to be reset is ON
• Note that the following functions will not be monitored properly if they are
monitored from two or more personal computers simultaneously.
Program monitor list, Interrupt program monitor list, Monitor condition setup,
Monitor stop condition setup, Scan time measurement
17
• For points to note about monitoring display when the FX series is selected see
Appendix 11.
• For the AnACPU or AnUCPU, the status at execution of the END instruction is
monitored. For the AnACPU or AnUCPU, however, note that the status at any
point during scan execution may be monitored.
Though the monitor result may differ, the program run is not different.
17 - 2
17 - 2