Hardware Stroke Limit; Relevant Variables - Mitsubishi Electric MELSEC iQ-R Series User Manual
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8.4
Hardware Stroke Limit
In the "hardware stroke limit function", limit switches are set at the upper/lower limit of the physical movable range, and the
control is stopped by the input of a signal from the limit switch.
Damage to the machine can be prevented by stopping the control before the upper/lower limit of the physical movable range
is reached.
WARNING
The negative logic (b-contact) is recommended for wiring the hardware stroke limit. If the positive logic (a-contact) is used, a serious accident may occur when
disconnection or sensor failure occurs.
For details of the signals that can be used in the hardware stroke limit, refer to the following.
Page 356 External Signal Selection
Relevant variables
Variable/Structure name
AxisName.PrConst.
HwStrokeLimit_FlsSignal
Name
Upper limit signal
Details
Sets a signal using the upper limit signal (FLS).
HwStrokeLimit_FlsSignal is the structure of SIGNAL_SELECT type.
For details of SIGNAL_SELECT type, refer to the following.
Page 356 SIGNAL_SELECT structure
The specific setting and the operation of this signal are shown below.
• IO No.
Ignores the input value.
• Target
When the specification is not set, signal disabled is determined and
the signal undetection status is always set.
When unavailable data is set, the error "Target of FLS Signal
Incorrect" (error code: 1AC4H) is output.
Type [CONST] can be used.
• Signal detection method
The specification is allowed at the following level detection only.
When edge detection specification is set, the error "Out of Signal
Logical Setting of FLS Signal Range" (error code: 1AD1H) is output.
0: HighLevel Detection at TRUE
1: LowLevel Detection at FALSE
• Compensation time
Ignores the input value.
• Filter time
Setting range of the filter time is 0.0 to +5.0.
When a value outside the range is set, the warning "Out of Filter
Time Setting of FLS Signal Range Warning" (warning code: 0D24H)
is output.
The fetch timing of the label is at the system start, and the detection
timing of the signal is the axis operation cycle.
8 RELEVANT FUNCTIONS to POSITION
8.4 Hardware Stroke Limit
8
289
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