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19 BUILT-IN I/O FUNCTION
19.2 FX3-compatible high-speed counter function
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Parameters are enabled when the CPU module is powered ON or after a reset.
Special relay list
A list of special relays used for high-speed counters is provided below.
Only the special relay corresponding to the LC device used as the high-speed counter operates when the FX3 compatible
high-speed counter function is valid.
The special relay/special registers other than those described in the list below operates in the same manner as when the FX3
compatible high-speed counter function is not valid.
Preset Input Enable/Disable Not available for FX3-compatible high-speed counters
Input Logic Sets preset input logic when preset input is enabled. • Positive Logic
• Negative Logic
Preset Value Sets preset input logic when preset input is enabled.
Input Comparison Enable/
Disable
Sets whether to "enable" or "disable" input comparison
when preset input is enabled.
• Disable
• Enable
Control Switch Sets preset execution timing when preset input is enabled. • Rising
• Falling
• Rising + Falling Edge
• Always During Input ON
Enable Input Enable/Disable Not available for FX3-compatible high-speed counters
Input Logic
Ring Length Enable/Disable
Ring Length
Measurement Unit Time
Pulses No. of per Rotation
Special relay Function Operation Default R/W
ON OFF
SM8246 LC46 counting direction monitoring Down-counting Up-counting OFF R
SM8247 LC47 counting direction monitoring Down-counting Up-counting OFF R
SM8248 LC48 counting direction monitoring Down-counting Up-counting OFF R
SM8249 LC49 counting direction monitoring Down-counting Up-counting OFF R
SM8250 LC50 counting direction monitoring Down-counting Up-counting OFF R
SM8251 LC51 counting direction monitoring Down-counting Up-counting OFF R
SM8252 LC52 counting direction monitoring Down-counting Up-counting OFF R
SM8253 LC53 counting direction monitoring Down-counting Up-counting OFF R
SM8254 LC54 counting direction monitoring Down-counting Up-counting OFF R
SM8255 LC55 counting direction monitoring Down-counting Up-counting OFF R
Item Description Setting range Default