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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 - 57
A
Common Items
B
Built-in
Positioning
Functions
Apx.
Example
Connection
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: Will be turned on if the instruction is executed properly.
• "Instruction execution abnormal end" flag: Will be turned on if the instruction is not executed properly.
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 (pulse output destination) cannot be specified when the 14-point or 24-point type FX
3G PLC is
connected.
*2. Devices related to Y003 (pulse output destination) are only valid if two FX
3U-2HSY-ADP 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 (pulse output destination) cannot be specified when the 14-point or 24-point type FX
3G PLC is
connected.
*2. Devices related to Y003 (pulse output destination) are only valid if two FX
3U-2HSY-ADP 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