Omron CJ2 CPU UNIT SOFTWARE User Manual page 400

10 CPU Unit Functions
Precautions for Correct Use Precautions for Correct Use
The cycle time will be longer than normal when a program is overwritten using Online Editing in
MONITOR mode, so make sure that the amount of time that it is extended will not exceed the
cycle monitoring time set in the PLC Setup. If it does exceed the monitoring time, then a Cycle
Time Over error will occur, and the CPU Unit will stop. Restart the CPU Unit by selecting PRO-
GRAM mode first before changing to RUN or MONITOR mode.
Note 1 The internal status (differentiation flags) for DIFFERENTIATE UP instructions (DIFU or instruc-
tions with @) and DIFFERENTIATE DOWN instructions (DIFD or instructions with %) con-
tained in the program to be edited online will be initialized.
2 If the task being edited online contains a block program, WAIT status created by WAIT(805),
TIMW(813), TIMWX(816), CNTW(814), CNTWX(817), TMHW(815), or TMHWX(818) will be
cleared by BPPS(811), and the next execution will be from the beginning.
Online Editing from CX-Programmer
1
Display the program section that will be edited.
2
Select the instructions to be edited.
3
Select Program, Online Edit, and then Begin.
4
Edit the instructions.
5
Select Program, Online Edit, and then Send Changes. The instructions will be checked and, if
there are no errors, they will be transferred to the CPU Unit. The instructions in the CPU Unit will
be overwritten and cycle time will be increased at this time.
Proceed with Online Editing only after verifying that the extended cycle time will not affect
operation. Input signals may not be input if the cycle time is too long.
Additional Information
Temporarily Disabling Online Editing
It is possible to disable online editing for a specific time to ensure response characteristics for
machine control in that cycle. Disabling online editing can prevent the cycle time from being inad-
vertently extended by someone performing online editing.
• Settings for Disabling Online Editing
Either of the two following settings can be used to disable online editing.
Set the Online Editing Disable Bit Validator (A527.00 to A527.07) to 5A hex.
Turn ON the Online Editing Disable Bit (A527.09).
• Operation with Online Editing Disabled
If there is a request from the CX-Programmer for online editing, the system will enter standby
status and not perform online editing. The Online Editing Wait Flag (A201.10) will turn ON.
Next, online editing will be performed when the user turns OFF the Online Editing Disable Bit
(A527.09). If online editing is already on standby, any online editing operations will be ignored.
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! Caution
CJ2 CPU Unit Software User's Manual