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Chapter 14 Common Functions
14.1 Outline of common functions
"Common functions" are executed according to the user's requirements, regardless of
the control method, etc. These common functions are executed by GX Works2 or
sequence programs.
The following table shows the functions included in the "common functions".
Common function Details
Means
Sequence
program
GX Works2
Parameter initialization function
This function returns the parameter stored in the
buffer memory/internal memory and flash
ROM/internal memory (nonvolatile) of Simple Motion
module to the factory-set initial value.
Execution data backup
function
This function writes the "execution data", currently
being used for control, to the flash ROM/internal
memory (nonvolatile).
External signal selection
function
This function is used to select from the following
signals when using the upper/lower limit signal and
the proximity dog signal.
• External input signal of servo amplifier
• External input signal via CPU (the buffer memory of
QD77GF)
External I/O signal logic
switching function
This function switches I/O signal logic according to
the equipment connected to the Simple Motion
module.
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".
History monitor function
This function monitors start history, error history,
warning history, and current value history of all axes.
—
Virtual servo amplifier function
This function executes the operation as the axis
(virtual servo amplifier axis) that operates only
command (instruction) virtually without servo
amplifiers.
Mark detection function
This function is used to latch any data at the input
timing of the mark detection signal (DI1 to DI4).
Module error collection function
This function collects errors occurred in the Simple
Motion module in the PLC CPU.
Holding the error contents in the PLC CPU, this
function enables to check the error history even after
the PLC CPU in powered off or reset.
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