Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 199

Positioning instruction activation timing
■When the absolute position detection system is used
For the axis in which the absolute position detection system is used, activate the DABS instruction when the servo amplifier is
powered on. (Page 154 Absolute Position Detection System) After the ABS data has been read, the servo-ON (SON is
on) status is retained, and it is disengaged when the DABS instruction is turned off. Activate the other instructions after the
DABS instruction has read the ABS data.
■When the pulse output monitor is on
If the pulse output monitor is on, a positioning instruction (excluding the DABS instruction) that uses the same axis cannot be
executed. (Page 75 Pulse output monitor)
While a pulse output monitor is on even after the positioning instruction drive contact is set to off, a positioning instruction for
the same output axis cannot be executed. Before re-executing a pulse output or positioning instruction, wait until the pulse
output monitor turns off and one or more operation cycles pass.
■When a user interrupt is used
Driving a positioning instruction requires multiple scans and has both rising processing and falling processing. Thus,
positioning does not operate normally if the positioning instruction is skipped by CJ instruction or if it is not executed every
scan like inside an interrupt program. However, pulse output continues. Eliminating the instruction by writing during RUN also
prevents the positioning from operating normally, and pulse output is stopped.
If the instruction is skipped, the complete flag does not turn on after the positioning operation stops. The complete flag turns
on if the positioning instruction is executed again when CJ instruction is canceled or the user interrupt program is executed
again. When the instruction is skipped, if disable all outputs (SM8034), pulse stop command, pulse decelerate and stop
command, or limit in the movement direction is detected during a scan in which the positioning instruction is not executed, the
positioning operation stops. The user-specified complete flag turns on, but the FX3 compatible complete flag (SM8029) does
not turn on.
Functions that share inputs and outputs
The inputs and outputs specified with the positioning parameter cannot be simultaneously used with another high-speed input/
output function depending on the combination. For the other high-speed input/output functions, refer to MELSEC iQ-F FX5
User's Manual (Application).
■CPU module
• Input
The following functions occupy inputs of the high-speed input/output function.
Function
*1
Input interrupt Interrupt (Rising)
Interrupt (Falling)
Interrupt (Rising + Falling)
Interrupt (Rising) + Pulse Catch
High-speed counter A phase input
B phase input
External preset input
External enable input
Pulse width measurement
Positioning Near-point dog signal
Zero signal
Interrupt input signal 1
External start signal
Up to CH/axis Device
8 CH X0 to X17
*2
8 CH X0 to X17
4 CH X0 to X7
4 axis X0 to X17
4 axis X0 to X17
4 axis X0 to X17
4 axis X0 to X17
Simultaneous useable
function
The functions other than
high-speed counter (A phase
input, B phase input)
Cannot be combined

Input interrupt
Input interrupt
• Input interrupt
• Zero signal
*3
• Input interrupt
• Near-point dog signal
*3
Input interrupt
*3
Input interrupt
7 PROGRAMMING
7.2 Cautions for Program Creation
7
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