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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
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19
High-speed counter overflow
Flag that detects counter value overflow of high-speed 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.
• Does not operate when ring length setting is enabled.
• 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 underflow
Flag that detects counter value underflow of high-speed 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.
• Does not operate when ring length setting is enabled.
• These devices also operate when the FX3 compatible high-speed counter function is valid.
■Update timing
The timing of device update is as follows.
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM4532 SM4533 SM4534 SM4535 SM4536 SM4537 SM4538 SM4539
Operation when ON Operation when OFF
Overflow occurs
(Current value counted = +1 past maximum positive value)
Overflow does not occur
ON OFF
• Overflow occurs (This is updated with the END processing. When the FX3
compatible high-speed counter function is valid, the updating is made also
when instruction UDCNTF instruction is executed ON.)
• When OFF by the user
• Power ON, reset
•STOP/PAUSERUN
• SM50 turned ON
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM4548 SM4549 SM4550 SM4551 SM4552 SM4553 SM4554 SM4555
Operation when ON Operation when OFF
Underflow occurs
(Current value counted = -1 past maximum negative value)
Underflow does not occur
ON OFF
• Underflow occurs (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.)
• When OFF by the user
• Power ON, reset
•STOP/PAUSERUN
• SM50 turned ON