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PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
4 Before Programming
4.2 Setting of Various Items Regarding Speeds
B - 46
4.2.6 Setting of Bias Speed
To control the stepping motor using each instruction, set the bias speed considering the resonance range of
the stepping motor and the automatic start frequency.
Use the devices shown in the following table to determine the bias speed for 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.
4.2.7 Setting of Acceleration Time
Set the time required for acceleration from the bias speed to the maximum speed.
If the output pulse frequency is less than the maximum speed, the actual acceleration time will be shorter than
the set acceleration time.
If the variable speed pulse output (PLSV) instruction is used, the set acceleration time is only valid during
acceleration/deceleration (M8338 = ON)
*3
.
Use the devices shown in the following table to determine the acceleration time for 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.
*3. Only available for FX
3U/FX3UC PLC Ver. 2.20 or later and FX3G PLC.
Pulse output
destination device
Bias speed
Initial value Setting range
Y000 D8342
0Hz
1/10 or less of maximum speed:
If the value is set to more than 1/10 of the maximum speed,
the bias speed will be automatically set to 1/10 of the
maximum speed.
Y001 D8352
Y002
*1
D8362
Y003
*2
D8372
Pulse output
destination device
Acceleration
Time
Initial value Setting range
Y000 D8348
100ms
50 to 5,000 ms:
If the value is set to 49 ms or less, the acceleration time will
be automatically set to 50 ms. If the value is set to 5,001 ms
or more, the acceleration time will be automatically set to
5,000 ms.
Y001 D8358
Y002
*1
D8368
Y003
*2
D8378