Special Relay List - Mitsubishi Electric FX5 User Manual

Item
Preset Value
Input Comparison Enable/
Disable
Control Switch
Enable Input Enable/Disable
Input logic
Ring Length Enable/Disable
Ring Length
Measurement Unit Time
No. of Pulse per Rotation
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.
Special relay Function
SM8246 LC46 counting direction monitoring
SM8247 LC47 counting direction monitoring
SM8248 LC48 counting direction monitoring
SM8249 LC49 counting direction monitoring
SM8250 LC50 counting direction monitoring
SM8251 LC51 counting direction monitoring
SM8252 LC52 counting direction monitoring
SM8253 LC53 counting direction monitoring
SM8254 LC54 counting direction monitoring
SM8255 LC55 counting direction monitoring
LC count direction monitor
This is the device to monitor the directions of the counters from LC46 to LC55 when the FX3 compatible high-speed counter is
used.
■Operation Description
The content of the operation when ON and when OFF is as follows.
Operation when ON
High-speed counter counting in direction whereby current value is reduced
(Down-counting)
■Update timing
The timing of device update is as follows.
ON
Down-counting (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.)
24 HIGH-SPEED INPUT/OUTPUT FUNCTION
258
24.2 FX3-compatible high-speed counter function
Description
Sets preset input logic when preset input is enabled.
Sets whether to "enable" or "disable" input comparison
when preset input is enabled.
Sets preset execution timing when preset input is enabled.
Not available for FX3-compatible high-speed counters
Setting range

• Disable
• Enable
• Rising
• Falling
• Rising + Falling Edge
• Always During Input ON

Operation
ON OFF
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Down-counting Up-counting
Operation when OFF
High-speed counter counting in direction whereby current value is increased
(Up-counting)
OFF
• Up-counting (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.)
• Power ON, reset
• STOP/PAUSE→RUN
Default




Default R/W
OFF R
OFF R
OFF R
OFF R
OFF R
OFF R
OFF R
OFF R
OFF R
OFF R