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14
Basic PC Operation and I/O Processes
Section 1-3
1-3-4
Peripheral Port Servicing Time
The following settings are used to determine the percentage of the cycle time
devoted to servicing the peripheral port.
Example:
If DM 6617 is set to 0115, the peripheral port will be serviced for
15% of the cycle time.
The minimum servicing time is 0.256 ms.
The entire servicing time will not be used unless processing requests exist.
1-3-5
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.
1-3-6
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.
15
0
Bit
Servicing time setting enable
00: Disabled (5% of the cycle time)
01: Enabled (setting in bits 00 to 07 used)
Servicing time
(%, valid when bits 08 to 15 are set to 01)
00 to 99 (BCD, two digits)
Default:
5% of cycle time
DM 6617
15
0
Bit
DM 6619
Cycle time
(4-digit 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
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