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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
High-speed counter (1-phase 2-input, 2-phase 2-input) count direction monitor
Device for monitoring counter direction when using 1-phase 2-input, 2-phase 2-input counter.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
■Operation Description
The content of the operation when ON and when OFF is as follows.
These devices also operate when the FX3 compatible high-speed counter function is valid.
■Update timing
The timing of device update is as follows.
High-speed counter (1-phase 1-input S/W) (internal clock) count direction switch
Device for switching counter direction when using 1-phase 1-input (S/W) counter or internal clock.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
■Operation Description
The content of the operation when ON and when OFF is as follows.
• Setting is ignored for counter other than 1-phase 1-input (S/W), internal clock.
• These devices also operate when the FX3 compatible high-speed counter function is valid.
■Update timing
The timing of device update is as follows.
Can also be modified while the high-speed counter is operating.
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM4564 SM4565 SM4566 SM4567 SM4568 SM4569 SM4570 SM4571
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 (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
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM4580 SM4581 SM4582 SM4583 SM4584 SM4585 SM4586 SM4587
Operation when ON Operation when OFF
High-speed counter current value counted -1 when phase A input ON High-speed counter current value counted +1 when phase A input ON
ON OFF
When ON by the user (update by END processing) • When OFF by the user (update by END processing)
• Power ON, reset
•STOP/PAUSERUN