FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
4 Before Programming
4.4 Current Value and Flag for Monitoring of Operation
B - 66
4.4.2 Completion of Instruction Execution ("Instruction execution complete" Flag,
"Instruction execution abnormal end" Flag)
Use the "Instruction execution complete" flag or "Instruction execution abnormal end" flag to check whether
execution of the positioning instruction has been completed properly.
The "Instruction execution complete" flag and "Instruction execution abnormal end" flag are turned on or off
after each instruction. Use these flags just after the execution of each instruction.
For programming details, refer to Subsection 4.7.4.
• "Instruction execution complete" flag (M8029): Will be turned on if the instruction is executed properly.
*1
• "Instruction execution abnormal end" flag (M8329): Will be turned on if the instruction is not executed
properly.
*1. Will not be turned on for execution of the PLSV instruction.
Caution:
If the "Instruction execution complete" flag or "Instruction execution abnormal end" flag is turned on, then the
execution of the instruction (pulse outputting operation, etc.) is complete. However, it is not certain whether
the servo motor has stopped or not. Check the "positioning completion" signal of the servo amplifier (drive
unit) to determine whether the servo motor has stopped.
4.4.3 "Pulse Output Monitor" (BUSY/READY) Flag
Use the "pulse output monitor" (BUSY/READY) flag to check whether pulses are being output to the pulse
output destination device. The following table shows the "pulse output monitor" (BUSY/READY) flag of each
pulse output destination device.
*1. Y002 is not available in FX
3G PLC (14-point and 24-point type) and FX3S/FX3GC PLC.
*2. Y003 is available only when two high-speed output special adapters are connected to the FX
3U PLC.
4.4.4 "Positioning Instruction Activation" Flag
Use the "positioning instruction activation" flag of each pulse output destination device to check whether or
not a positioning instruction is being executed for the pulse output destination device. Use this flag to prevent
simultaneous activation of two or more positioning instructions for the same pulse output destination device.
*1. Y002 is not available in FX
3G PLC (14-point and 24-point type) and FX3S/FX3GC PLC.
*2. Y003 is available only when two high-speed output special adapters are connected to the FX
3U PLC.
Pulse output
destination device
"Pulse output monitor"
(BUSY/READY) flag
Status of flag and pulse
Y000 M8340
Outputting pulse (BUSY): Flag = ON
Pulse outputting stopped (READY): Flag = OFF
Y001 M8350
Y002
*1
M8360
Y003
*2
M8370
Pulse output
destination device
"Positioning instruction
Activation" flag
Status of flag and pulse
Y000 M8348 ON: The positioning instruction is being activated for the
corresponding pulse output destination.
(Even after instruction execution is completed, if the
instruction is still being activated, the flag will not be
turned off.)
OFF: The positioning instruction is not being activated for the
corresponding pulse output destination.
Y001 M8358
Y002
*1
M8368
Y003
*2
M8378
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