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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
■Update timing
The timing of device update is as follows.
• Cannot be modified while the high-speed counter is operating. Operates in the configured status when the
high-speed counter starts.
• When the current value of a high-speed counter is rewritten with the DHCMOV instruction, the comparison
process is not executed.
• When the preset control switch is set to "Constant when ON", the preset input comparison is disabled.
High-speed counter enable input logic
These devices are used for setting the enable input logic.
■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.
Cannot be modified while the high-speed counter is operating. Operates in the configured status when the
high-speed counter starts.
High-speed counter ring length setting
These devices enable or disable the ring length setting for ring counters.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
ON OFF
• When ON by the user
• When set to enabled with parameters
• When OFF by the user
• When set to disabled with parameters
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM4628 SM4629 SM4630 SM4631 SM4632 SM4633 SM4634 SM4635
Operation when ON Operation when OFF
The enable input operates with negative logic
(Enabled when the enable input is OFF)
The enable input operates with positive logic
(Enabled when the enable input is ON)
ON OFF
• When ON by the user
• When set to negative logic with parameters
• When OFF by the user
• When set to positive logic with parameters
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM4644 SM4645 SM4646 SM4647 SM4648 SM4649 SM4650 SM4651