Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 153

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.
CPU module
CH1 CH2
SM4644 SM4645
High-speed pulse input/output module
First module
CH9 CH10
SM4652 SM4653
■Operation Description
The content of the operation when ON and when OFF is as follows.
Operation when ON
Enables the ring length setting for a ring counter
(Counts in the range of 0 to ring length counter-1)
These devices do not operate when the FX3 compatible high-speed counter function is valid.
■Update timing
The timing of device update is as follows.
ON
• When ON by the user
• When set to enabled with parameters
• Cannot be modified while the high-speed counter is operating. Operates in the configured status when the
high-speed counter starts.
• The ring length setting is disabled if the pulse density measurement mode or rotational speed measurement
mode is selected.
Precautions
If these devices are turned on when a high-speed counter's current value is out of the ring length range, the current value
when the high-speed counter is operated is as follows.
• Lower than lower limit value  Lower limit value
• Higher than upper limit value  Upper limit value
High-speed comparison table (high-speed compare instruction) operation
This device is for monitoring the operational status of the high-speed counter's high-speed comparison table and the high-
speed comparison instruction.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
CPU module
CH1 CH2 CH3 CH4
SM4980
CH3 CH4
SM4646 SM4647
Second module
CH11 CH12
SM4654 SM4655
High-speed pulse input/output module
First module
CH5 CH6 CH7 CH8 CH9
SM4984
CH5 CH6
SM4648 SM4649
Third module
CH13 CH14
SM4656 SM4657
Operation when OFF
Disables the ring length setting for a ring counter
(Counts in the range of -2147483648 to +2147483647)
OFF
• When OFF by the user
• When set to disabled with parameters
Second module Third module
CH10 CH11 CH12 CH13
SM4988 SM4992
19 HIGH-SPEED INPUT/OUTPUT FUNCTION
19.1 High-speed Counter Function
CH7 CH8
SM4650 SM4651
Fourth module
CH15 CH16
SM4658 SM4659
Fourth module
CH14 CH15 CH16
SM4996
151
19