Mitsubishi Electric MELSEC FX3U Programming Manual page 394

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. Monitoring the current number of generated pulses
The number of pulses output from Y000 or Y001 is stored in the following special data registers:
Device
High Low
order order
D8141 D8140
D8143 D8142
D8137 D8136
The contents of each data register can be cleared using the following program:
Command
input
FNC 12
DMOV
3. How to stop the pulse output
• When the command input is set to OFF, the pulse generation is immediately stopped. When the command
input is set to ON again, pulse generation operation restarts from the beginning.
• When the special auxiliary relays (M) shown below are set to ON, the pulse output is stopped.
Device
FX
3G
M8145,M8349
M8146,M8359
To restart pulse output, set the device (FX
FX /FX : M8349, M8359) corresponding to the output signal to OFF, and then drive the pulse output
3U 3UC
instruction again.
Cautions
1. When a word device is specified as
When the value of the word device is changed while the instruction is executed, the following operation
results:
• When the data in
• When the data in
driven.
2. Frequency
When using transistor outputs in the main unit, set the output frequency
If the load is operated using pulses at a frequency higher than 100,000 Hz, the PLC may be damaged.
3. Pulse output
• Only a transistor output on the main unit or Y000 or Y001 on a special high speed output adapter
specified in
When using the PLSY (FNC 57) instruction with a relay output type FX
adapter is required.
*1. High-speed output special adapters can be connected only to FX
• The duration of the ON/OFF pulses is 50% (ON = 50%, OFF = 50%).
• The pulse output is controlled by the dedicated hardware not affected by the sequence program (operation
cycle).
• If the command input is set to OFF during continuous pulse output, the output from
392
Description
Accumulated number of pulses
output from Y000
Accumulated number of pulses
output from Y001
Total accumulated number of
pulses output from Y000 and
Y001
Low-order device shown in
K0
table above
FX •FX
3U 3UC
M8349 Immediately stops pulse output from Y000.
M8359 Immediately stops pulse output from Y001.
is changed, the output frequency changes accordingly.
S
1
is changed, the change (new value) becomes valid the next time the instruction is
S
2
S
1
.
D
13 High Speed Processing – FNC 50 to FNC 59
Accumulated number of pulses output from Y000 by PLSY and PLSR
instructions
Accumulated number of pulses output from Y001 by PLSY and PLSR
instructions
Total accumulated number of pulses output from Y000 and Y001 by
PLSY and PLSR instructions
Description
: M8145, M8146, M8349, M8359
3G
or
S S
1 2
13.8 FNC 57 – PLSY / Pulse Y Output
Contents of data
to "100,000 Hz" or less.
S
1
PLC, a special high speed output
3U
PLC.
3U
turns OFF.
D
*1
can be