Mitsubishi Electric Q172CPU Programming Manual page 55

4 POSITIONING DEDICATED SIGNALS
(3) Address clutch reference setting command (M3213+20n)
This signal is only effective when the output module is a cam connected an
address mode clutch or a rotary table, and it is used to specify the "0" reference
position for the current value within 1 virtual axis revolution.
The following processings are executed based on the ON/OFF state of the
address clutch reference setting command at the switching request from real to
virtual mode.
(a) M3213+20n : ON
Virtual mode operation starts as "0" for the current value within 1 virtual
axis revolution of the main shaft and auxiliary input axis.
(b) M3213+20n : OFF
• If the drive module is a virtual servomotor or an incremental synchronous
encoder, operation will be continued from the current value within 1 virtual
axis revolution for the main shaft and auxiliary input axis in the previous
virtual mode.
• If the drive module is an absolute synchronous encoder, operation will be
continued from the current value within 1 virtual axis revolution for the
main shaft and auxiliary input axis calculated from the current value of
synchronous encoder.
(4) Cam reference position setting command (M3214+20n)
This signal is only effective when the output module is a cam, and it is used to
specify the cam reference position.
The following processings are executed based on the ON/OFF state of the cam
reference position setting command at the switching request from real to virtual
mode.
(a) M3214+20n : ON
• The current value is cam reference position.
• The current feed current value is lower stroke limit value (bottom dead
point). Moreover, a cam table search is conducted from the beginning of a
cycle, and the bottom dead point (0) is specified as the current value
within 1 cam shaft revolution.
Stroke amount
Lower stroke limit
Feed current value
(bottom dead point)
when M3214+20n is ON.
• After the bottom dead point alignment of cam is completed at the system
start-up, it must be turned on at the first real to virtual mode switching.
Once the bottom dead point setting is set, operation will be continued with
M3214+20n ON by switching from real to virtual mode.
(The bottom dead point position is stored in the backup memory.)
0
1 cycle
Current value within 1 cam shaft revolution = 0
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.......... Command signal
.......... Command signal
Number of pulses within
1 cam shaft revolution-1