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MELSEC-Q
13 COMMON FUNCTIONS
13.1 Outline of common functions
"Common functions" are executed according to the user's requirements, regardless of
the control system, etc. These common functions are executed by peripheral devices
or using PLC programs.
The following table shows the functions included in the "common functions".
Means
Common function Details
PLC
program
Peripheral
devices
Parameter initialization
This function returns the
parameter stored in the QD75MH
buffer memory and flash ROM to
the factory-set initial value.
Execution data backup
This function writes the
"execution data", currently being
used for control, to the flash
ROM.
External I/O signal logic
switching
This function switches I/O signal
logic according to the equipment
connected to the QD75MH.
For the system in which with b-
contact, upper limit switch, and
lower limit switch are not used,
the parameter logic setting can
be controlled without wiring if it is
changed to a "positive logic".