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Basic PC Operation and I/O Processes Section 4-7
The cycle monitor time is used for checking for extremely long cycle times, as
can happen when the program goes into an infinite loop. If the cycle time
exceeds the cycle monitor setting, a fatal error (FALS 9F) will be generated.
Note 1. The units used for the maximum and current cycle times recorded in the
AR area (AR 14 and AR 15) are determined by the setting for the cycle
monitor time in DM 6618, as shown below.
Bits 08 to 15 set to 01 (Hex):0.1 ms
Bits 08 to 15 set to 02 (Hex):1 ms
Bits 08 to 15 set to 03 (Hex):10 ms
2. If the cycle time is 1 s or longer, the cycle time read from Programming De-
vices will be 999.9 ms. The correct maximum and current cycle times will
be recorded in the AR area.
Example
If 0230 is set in DM 6618, an FALS 9F error will not occur until the cycle time
exceeds 3 s. If the actual cycle time is 2.59 s, the current cycle time stored in
the AR area will be 2590 (ms), but the cycle time read from a Programming
Device will be 999.9 ms.
A “cycle time over” error (non-fatal) will be generated when the cycle time
exceeds 100 ms unless detection of long cycle times is disabled using the set-
ting in DM 6655.
4-7-7 Minimum Cycle Time
Make the settings shown below to standardize the cycle time and to eliminate
variations in I/O response time by setting a minimum cycle time.
If the actual cycle time is shorter than the minimum cycle time, execution will
wait until the minimum time has expired. If the actual cycle time is longer than
the minimum cycle time, then operation will proceed according to the actual
cycle time. AR 2405 will turn ON if the minimum cycle time is exceeded.
4-7-8 Input Time Constants
Make the settings shown below to set the time from when the actual inputs
from the DC Input Unit are turned ON or OFF until the corresponding input
bits are updated (i.e., until their ON/OFF status is changed). Make these set-
tings when you want to adjust the time until inputs stabilize.
Increasing the input time constant can reduce the effects from chattering and
external noise.
Use a Programming Device to set the input time constants.
15 0
Bit
DM6619
Cycle time (4 digits BCD)
0000:Cycle time variable
0001 to 9999: Minimum cycle time (Unit: 1 ms)
Default: Cycle time variable
Input from an input device
such as a limit switch
Input bit status
Input time constant
t t