Axis Monitor Devices - Mitsubishi Electric Q172CPU Programming Manual

4 POSITIONING DEDICATED SIGNALS

4.2.1 Axis monitor devices

The monitoring data area is used by the Motion CPU to store data such as the feed
current value during positioning control, the real current value and the number of
droop pulses in the deviation counter.
It can be used to check the positioning control state using the Motion SFC program.
The user cannot write data to the monitoring data area (except the travel value
change register).
Refer to APPENDIX 5 "Processing Times of the Motion CPU" for the delay time
between a positioning device (input, internal relay and special relay) turning on/off and
storage of data in the monitor data area.
(1) Feed current value/roller cycle speed storage register
(D0+20n, D1+20n) ................................................... Monitor device
(a) The target address which is output to the servo amplifier is stored in this
register. The target address is based on the command address calculated
from the mechanical system program settings.
(b) The stroke range check is performed on this feed current value data.
(c) Roller cycle speed is stored.
The storage range for cycle speed the roller cycle speed storage register is
shown below.
Setting Units
mm
inch
(2) Real current value storage register (D2+20n, D3+20n)
(a) This register stores the real current value which took the droop pulses of the
servo amplifier into consideration to the feed current value.
(b) The "feed current value" is equal to the "real current value" in the stopped
state.
(3) Deviation counter value storage register (D4+20n, D5+20n)
This register stores the droop pulses read from the servo amplifier.
(4) Minor error code storage register (D6+20n) ........... Monitor device
(a) This register stores the corresponding error code (Refer to APPENDIX 2.4
and 2.7) at the minor error occurrence. If another minor error occurs after
error code storing, the previous error code is overwritten by the new error
code.
(b) Minor error codes can be cleared by an error reset command (M3207+20n).
Storage Range
1 to 600000000
4 - 65
Real Roller Cycle Speed
0.01 to 6000000.00 [mm/min]
0.001 to 600000.000 [inch/min]
.............. Monitor device
.............. Monitor device