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3UC
PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
4 Before Programming
4.5 Setting of Various Items on PLC Side
B - 60
Example program:
In the following program, the zero return instruction with DOG search function (DSZR), variable speed pulse
output (PLSV) instruction, and interrupt positioning (DVIT) instruction are used for the pulse output
destination (Y000) under the conditions shown in the following table.
1) Set conditions
*1. Only available for FX
3U and FX3UC PLCs.
Setting item Description of setting
Related
device
Setting value
or condition
Items related to speed
Maximum speed 30000Hz
D8344,
D8343
(32-bit)
K30000
Bias speed
10Hz D8342 K10
Acceleration time
200ms D8348 K200
Deceleration time
200ms D8349 K200
Zero return speed
5000Hz
D8347,
D8346
(32-bit)
K5000
Creep speed
500Hz D8345 K500
Items needed for DSZR instruction (zero return instruction with DOG search function) and ZRN instruction (zero
return instruction)
Zero return direction
Reverse rotation direction M8342 OFF
CLEAR signal output
Output to Y010
M8341 ON
CLEAR signal device change
*6
M8464 ON
D8464 H0010
Logic of near-point signal
Sets the positive logic (turning on the input will
turn on the near-point signal).
M8345 OFF
Logic of zero-phase signal
Sets the positive logic (turning on the input will
turn on the zero-phase signal).
M8346 OFF
Items needed for variable speed pulse output (PLSV) instruction
Acceleration/deceleration Operation
If X012 is turned on, the variable speed pulse
output (PLSV) instruction will be activated to
accelerate or decelerate the operation.
M8338
ON:
If X012 = ON
Items needed for interrupt positioning (DVIT) instruction
*1
Interrupt input signal device change
Sets X007 for interrupt inputs.
Interrupt positioning (DVIT) instruction will not
be used for the pulse output destinations
Y001, Y002, and Y003.
M8336 ON
D8336 HFFF7
User interrupt input command
Do not use. M8460 -
Logic of interrupt input signal
Sets the negative logic (turning off the input
will turn on the interruption signal).
M8347 ON
Forward limit, reverse limit, and immediate stop of pulse output
Forward limit
If X010 is turned off (if the NC contact is
turned on), the limit switch will be activated.
M8343
ON:
If X010 = OFF
Reverse limit
If X011 is turned off (if the NC contact is
turned on), the limit switch will be activated.
M8344
ON:
If X011 = OFF
Immediate stop of pulse output Do not use. M8349 -