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Computing the Cycle Time Section 10-4
4: I/O Refreshing
5: Peripheral Servicing
Details Processing time and fluctuation cause
Basic I/O Units Basic I/O Units are refreshed. Outputs from
the CPU Unit to the I/O Unit are refreshed
first for each Unit, and then inputs.
I/O refresh time for each Unit multiplied by the number of
Units used.
Special I/O
Units
Words allocated in CIO Area I/O refresh time for each Unit multiplied by the number of
Units used.
Unit- specific
data
CompoBus/S remote
I/O
CPU Bus Units Words allocated in CIO and DM Areas I/O refresh time for each Unit multiplied by the number of
Units used.
Unit- specific
data
Data links for Control-
ler Link and SYSMAC
LINK Units, DeviceNet
remote I/O for CJ-
series DeviceNet Units,
send/receive data for
protocol macros, and
socket services for spe-
cific control bits for
Ethernet Units
I/O refresh time for each Unit multiplied by the number of
Units used.
Details Processing time and fluctuation cause
Services events for Special I/O Units.
Note Peripheral servicing does not include
I/O refreshing,
If a uniform peripheral servicing time hasn’t been set in the PLC Setup for
this servicing, 4% of the previous cycle’s cycle time (calculated in step (3))
will be allowed for peripheral servicing.
If a uniform peripheral servicing time has been set in the PLC Setup, servic-
ing will be performed for the set time. At least 0.1 ms, however, will be ser-
viced whether the peripheral servicing time is set or not.
If no Units are mounted, the servicing time is 0 ms.
Services events for CPU Bus Units.
Note Peripheral servicing does not include
I/O refreshing.
Same as above.
Services events for peripheral ports. If a uniform peripheral servicing time hasn’t been set in the PLC Setup for
this servicing, 4% of the previous cycle’s cycle time (calculated in step (3))
will be allowed for peripheral servicing.
If a uniform peripheral servicing time has been set in the PLC Setup, servic-
ing will be performed for the set time. At least 0.1 ms, however, will be ser-
viced whether the peripheral servicing time is set or not.
If the ports are not connected, the servicing time is 0 ms.
Services RS-232C ports. Same as above.
Services file access (Memory Card or EM
file memory).
If a uniform peripheral servicing time hasn’t been set in the PLC Setup for
this servicing, 4% of the previous cycle’s cycle time (calculated in step (3))
will be allowed for peripheral servicing.
If a uniform peripheral servicing time has been set in the PLC Setup, servic-
ing will be performed for the set time. At least 0.1 ms, however, will be ser-
viced whether the peripheral servicing time is set or not.
If there is no file access, the servicing time is 0 ms.
Services communications ports. If a uniform peripheral servicing time hasn’t been set in the PLC Setup for
this servicing, 4% of the previous cycle’s cycle time (calculated in step (3))
will be allowed for peripheral servicing.
If a uniform peripheral servicing time has been set in the PLC Setup, servic-
ing will be performed for the set time. At least 0.1 ms, however, will be ser-
viced whether the peripheral servicing time is set or not.
If no communications ports are used, the servicing time is 0 ms.
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