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10 ONLINE CHANGE
10.1 Online Ladder Block Change
Precautions
This section describes the precautions on using online ladder block change.
Online change to SFC program
Online change to the SFC program cannot be performed. However, online change to the other programs which coexist with
the SFC program (such as the ladder program) can be performed.
Prohibited operation at online ladder block change
When an online change of ladder block, if the power is turned OFF or a reset is made, the process does not end normally.
Such operation is made, execute rewriting to the PLC.
When deleting OUT instruction which is on
When deleting an OUT instruction (coil) which is not necessary for control, be sure to check that the OUT instruction is off
before deleting it. If the OUT instruction is deleted without turning it off in advance, the output will be retained.
Program file not registered in program setting
A program file which is not registered in parameter setting cannot be written.
Initializing the last execution if the ladder at online ladder block change has an FB call
• If a subroutine type FB is called in a FB definition, the execution information of the previous time in the FB definition of the
subroutine type FB is not initialized.
• If a macro type FB is called in the FB definition of a subroutine type, the execution information of the previous time in the
part equivalent to the macro type FB is not initialized either.
Instructions not compatible with online ladder block change
Do not execute online change to ladder block including the following instruction.
DSZR/DDSZR instruction, DVIT/DDVIT instruction, TBL instruction, DRVTBL instruction, PLSV/DPLSV instruction, DRVI/
DDRVI instruction, DRVA/DDRVA instruction, DRVMUL instruction, PLSY/DPLSY instruction, PWM/DPWM instruction, SPD/
DSPD instruction, HIOEN/DHIOEN instruction, UDCNTF instruction, DABS instruction, ADPRW instruction, IVCK instruction,
IVDR instruction, IVRD instruction, IVWR instruction, IVBWR instruction, IVMC instruction, S(P).CPRTCL instruction, RS2
instruction, SP.SOCOPEN instruction, SP.SOCCLOSE instruction, SP.SOCSND instruction, SP.SOCRCV instruction,
SP.ECPRTCL instruction, RBFM instruction, WBFM instruction
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