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Chapter 14 Common Functions
[3] Precautions during control
(1) Parameter initialization is only executed when the positioning control is not
carried out (when the PLC READY signal [Y0] is OFF).
The warning "In PLC READY" (warning code: 111) will occur if executed
when the PLC READY signal [Y0] is ON.
(2) Writing to the flash ROM is up to 100,000 times. If writing to the flash ROM
exceeds 100,000 times, the writing may become impossible, and the error
"Flash ROM write error" (error code: 801) will occur.
(3) A "PLC CPU reset" or "PLC CPU power restart" must be carried out after
the parameters are initialized.
(4) When using the QD77MS16, the setting value is set to "1" even though the
initial value setting is executed by this function because the initial value of
QD75MH "0" is out of the setting range in "[Pr.80] External input signal
selection".
Important
Parameter initialization takes about 10 seconds. (Up to 30 seconds are sometimes
required.)
Do not turn the power ON/OFF or reset the PLC CPU during parameter
initialization. If the power is turned OFF or the PLC CPU module is reset to forcibly
end the process, the data backed up in the flash ROM/internal memory
(nonvolatile) will be lost.
[4] QD75MH initial value setting method
(1) QD75MH initial value setting is carried out by the writing of the data shown in
the table below to the buffer memory using the TO command/intelligent
function device.
The initialization of the parameter is executed at the time point the data is
written to the buffer memory.
Setting item
Setting
value
Setting details
Buffer memory address
QD77MS2
QD77MS4
QD77MS16
[Cd.47]
QD75MH initial
value setting request
1
Set "1" (Requests QD75MH initial value
setting).
1909 5909
: Refer to Section 5.7.1 "System control data" for details on the setting details.
When the initialization is complete, "0" will be set in "[Cd.47] QD75MH initial
value setting request" automatically.