Omron FQM1-MMP21 用户手册

When using the constant cycle time function, normally the cycle time will no
longer stay constant (i.e., will vary depending on the real cycle time) if the
constant cycle time is exceeded once. To return to a constant cycle time even
if the cycle time has been exceeded once, turn ON the Constant Cycle Time
Exceeded Error Clear Bit (A509.15) (i.e., set to 1).

This function allows a constant cycle time to be restored and variations in I/O
processing time to be kept to a minimum even if the cycle time is temporarily
long as a result of special processing, e.g., initialization at the start of user
programs in each Module.

The constant cycle time function is cleared if the cycle time exceeds the set
constant cycle time.

The constant cycle time function can be enabled again by turning ON the
Constant Cycle Time Exceeded Clear Bit.

Constant cycle time cleared

Constant cycle 
time

Real cycle time

Time

Constant cycle 
time value

Cycle time

Constant cycle 
time

Cycle time

Constant cycle 
time 

Constant cycle time cleared

Constant cycle time 
enabled again

Real cycle time

Time

Constant Cycle Time 
Exceeded Flag 
(A404.05)

Constant Cycle Time 
Exceeded Error Clear Bit 
(A509.15)

ON for 1 scan

Constant Cycle Time 
Exceeded Error 
Clear Bit

A509.15

OFF to ON: 
Constant cycle time exceeded 
error cleared.

User