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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
High-speed comparison table (high-speed compare instruction) error occurrence
This device turns ON when driving the DHSCS, DHSCR, DHSZ instructions in excess of the limitation of the number of
instructions driven at the same time.
■Corresponding devices
The device number is shared for all channels.
■Operation Description
The content of the operation when ON and when OFF is as follows.
• Even when this device turns ON, the DHSCS, DHSCR, DHSZ instructions within the range of the number of
instructions driven at the same time will operate. For the limitation of the number of instructions driven at the
same time, refer to MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function
Blocks).
• These devices also operate when the FX3 compatible high-speed counter function is valid.
■Update timing
The timing of device update is as follows.
Multi-point output high-speed comparison table operation
This device is for monitoring the operational status of the high-speed counter's multi-point output high-speed comparison
tables.
■Corresponding devices
The device number is shared for all channels.
■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.
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM4982
Operation when ON Operation when OFF
DHSCS, DHSCR, DHSZ instructions operated in excess of the limitation of
the number of instructions driven at the same time
When there is no error
DHSCS, DHSCR, DHSZ instructions can operate
ON OFF
• Updated in END processing
• If an error occurs while the FX3 compatible DHSCS,DHSCR,and DHSZ
instruction ON execution, an operation is made also when the high-speed
counter function is valid.
• When OFF by the user
• Power ON, reset
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SM5000
Operation when ON Operation when OFF
Multi-point output high-speed comparison table operating
When the high-speed counter current value is equal to the set value specified
in the multi-point output high-speed comparison table parameters, the
specified pattern of output or the data transfer operates.
Multi-point output high-speed comparison tables stopped
Even when the high-speed counter current value is equal to the set value
specified in the multi-point output high-speed comparison table parameters,
the specified pattern of output or the data transfer is not executed.