Mitsubishi MELSEC-Q QD77MS, User Manual

Page: 769 / 976

14 - 2
Chapter 14 Common Functions
14.1 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 GX Works2 or
sequence programs.
The following table shows the functions included in the "common functions".
Means
Common function Details
Sequence
program
GX Works2
Parameter initialization function
This function returns the parameter stored in the
QD77MS buffer memory/internal memory and flash
ROM/internal memory (nonvolatile) 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 use the external input signal
of QD77MS, external input signal of servo amplifier
or external input signal via CPU (the buffer memory
of QD77MS) when using the upper/lower limit signal
and the near-point dog signal.
External I/O signal logic
switching function
This function switches I/O signal logic according to
the equipment connected to the QD77MS.
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 errors, warnings and start
history of all axes.
—
Amplifier-less operation
function
This function executes the positioning control of
QD77MS without connecting to the servo amplifiers.
It is used to debug the program at the start-up of the
device or simulate the positioning operation.
—
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).
Optional data monitor function
This function is used to store the data selected by
user up to 4 data per axis to buffer memory and
monitor them.
Module error collection function
This function collects errors occurred in the QD77MS
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.
—
Connect/disconnect function of
SSCNET communication
Temporarily connect/disconnect of SSCNET
communication is executed during system's power
supply ON.
This function is used to exchange the servo
amplifiers or SSCNET cables.
—
QD75MH initial value setting
function
This function is used to set the factory-set initial
value of QD75MH in the setting data set in the
QD77MS buffer memory/internal memory and flash
ROM/internal memory (nonvolatile).
—