Stop Instruction; Correction Of Backlash; Instruction Execution Complete" Flag Of Positioning Instruction And Completion Of Positioning - Mitsubishi Electric Melsec-F FX3GC Series User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U 3UC
Built-in Positioning Functions
4.7.2

STOP instruction

For the normal stop of an operation (stop after speed reduction), use the "instruction OFF" function or
"forward/reverse limit relay".
If an immediate stop is absolutely needed to avoid danger, use the pulse output stop command relay.
During execution of a positioning instruction, however, if the pulse output stop command relay is turned on,
the pulse outputting operation will be immediately stopped. This means that the motor will be stopped without
deceleration, which may damage the system. For this reason, take caution when using the pulse output stop
command relay.
Pulse output destination
device
Y000
Y001
*1
Y002
*2
Y003
*1. Y002 is not available in FX
*2. Y003 is available only when two high-speed output special adapters are connected to the FX
4.7.3

Correction of Backlash

The built-in positioning function cannot correct the mechanical backlash (clearance/play). If it is necessary to
correct the backlash, preliminarily set the number of output pulses considering the backlash that may be
caused when reversing the transfer direction.
Backlash
(clearance/play)
4.7.4 "Instruction execution complete" Flag of Positioning Instruction and Completion of
Positioning
If the Instruction execution complete flag (M8029) or the Instruction execution abnormal end flag (M8329) is
turned on, the execution of the instruction (pulse outputting operation, etc.) is completed. In this case,
however, it is not certain whether the servo motor has stopped. Check the "positioning completion" signal of
the servo amplifier (drive unit) to check whether the servo motor is stopped.
For details on the "Instruction execution complete" flag and "Instruction execution abnormal end"
PLC User's Manual - Positioning Control Edition
Pulse stop instruction
M8349
M8359
M8369
M8379
PLC (14-point and 24-point type) and FX
3G
Table
Feed screw
4.7 Items To Be Observed in Programming
Operation
During pulse outputting operation, if the pulse output stop
command relay of the corresponding pulse output
destination device is turned on, the pulse outputting
operation will immediately stop.
3S
flag, refer to Subsection 4.4.2.
4 Before Programming
/FX PLC.
3GC
PLC.
3U
B - 81
A
B
Apx.