Table of Contents
Advertisement
Online Editing
Effect on CPU Unit Operation
Performing online editing in MONITOR mode (i.e. while the CPU unit is in operation)
will:
1) Extend the cycle time for the CPU unit by several cycles when the CPU unit program
is rewritten; and
2) Further extend the cycle time upon completion of online editing, when the execution
results are backed up onto the internal flash memory. (During this time, the BKUP
indicator on the front of the CPU unit will be lit, and progress will be displayed by the
CX-Programmer.)
Extension of the cycle time by an online edit is as follows.
Maximum Extension of Cycle Time
1) During Online Edit
12 ms max.
When performing online editing in the MONITOR mode, ensure that the cycle time
Caution
required for the program to be updated does not exceed "Watch Cycle Time"
specified in PLC Settings. Otherwise, a cycle time error will occur, and operation of
the CPU unit will be stopped. To run the CPU unit again, first switch to the
PROGRAM mode, and then switch to the RUN mode or the MONITOR mode.
Limitations of Online Editing
Limitations for online editing are as follows.
• For CS/CJ-series units except for CJ2 CPU Units, SFC programs (including the
• For CS/CJ-series units except for CJ2 CPU Units, the maximum allowable
• After completing online editing, do not turn the PLC power OFF until the CPU unit
• Function blocks cannot be edited online
• Addresses allocated in steps and transitions during online editing will be initialized
• Perform online editing in two steps when adding an action program or transition
• Subcharts cannot be edited online.
Precautions on Online Editing
• If an SFC chart is changed using online editing in the same cycle in which step
5-1-2
Online Editing of Actions and Transitions Editing
Ladder and structured text programs for actions and transitions can be edited online,
as long as the PLC is not in the RUN mode.
108
action programs and transition programs) can be edited online only if they are 4K
steps or smaller.
change in size for a single online edit session is 0.5K.
completes a backup to the internal flash memory (i.e. until the BKUP LED on the
front of the CPU unit switches from lit to dimmed).
Turning the PLC power OFF before the backup is complete (i.e. while the BKUP
LED on the front of the CPU unit is still lit) will interrupt the backup, and the
program will revert back to the unedited state.
Also, neither function block definitions nor function block instances can be added
or deleted by editing online.
when online editing is ended.
program to an SFC chart.
1
First, use online editing to add the new action program or transition program to
the SFC program and transfer the data to the PLC.
2
Perform online editing again to add the action program or transition program
created in the first step to the SFC chart.
status changes, the final scan and the P0 action of steps that became inactive will
not be executed. The P and P1 actions of steps that became active will also not
be executed.
2) During Backup
4% of cycle time
Section 5-1
Advertisement
Chapters
Table of Contents
