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19 BUILT-IN I/O FUNCTION
19.2 FX3-compatible high-speed counter function
LC count direction monitor
This is the device to monitor the directions of the counters from LC35 to LC55 when the FX3 compatible high-speed counter is
used.
■Operation Description
The content of the operation when ON and when OFF is as follows.
■Update timing
The timing of device update is as follows.
Special relays/LC devices capable of high-speed transfers with
the HCMOV instruction
Shown below are the special relay/LC device that can read and write the latest value with the HCMOV instruction when the
FX3 compatible high-speed counter function is valid. When special relays and special registers are specified for (s) and (d) of
instructions other than the HCMOV instruction, the operation is the same as one compatible with the MOV instruction.
The same operation as when the FX3 compatible high-speed counter is not valid is made for the special relay/special register
capable of high-speed transfers with the HCMOV instruction other than those described in the list below.
Special relay
: High-speed transfer capable (special relay is immediately updated)
: Normal transfer capable (special relay is updated in END processing)
: Transfer not possible (read-only)
Operation when ON Operation when OFF
High-speed counter counting in direction whereby current value is reduced
(Down-counting)
High-speed counter counting in direction whereby current value is increased
(Up-counting)
ON OFF
Down-counting (This is updated with the END processing. When the FX3
compatible high-speed counter function is valid, the updating is made also
when UDCNTF instruction is executed ON.)
• Up-counting (This is updated with the END processing. When the FX3
compatible high-speed counter function is valid, the updating is made also
when UDCNTF instruction is executed ON.)
• Power ON, reset
•STOP/PAUSERUN
Special relay Function Compatible with
HCMOV instruction
Compatible with
MOV instruction
(s) (d) (s) (d)
SM8246 LC46 counting direction monitoring
SM8247 LC47 counting direction monitoring
SM8248 LC48 counting direction monitoring
SM8249 LC49 counting direction monitoring
SM8250 LC50 counting direction monitoring
SM8251 LC51 counting direction monitoring
SM8252 LC52 counting direction monitoring
SM8253 LC53 counting direction monitoring
SM8254 LC54 counting direction monitoring
SM8255 LC55 counting direction monitoring