Omron SYSMAC CS1D-PD Series Operation Manual page 399

Computing the Cycle Time
4: I/O Refreshing
Details
Basic I/O Units Basic I/O Units are refreshed. Out-
puts from the CPU Unit to the I/O
Unit are refreshed first for each
Unit, and then inputs.
Special I/O Words allocated in CIO Area
Units
CPU Bus Units Words allocated in CIO and DM
Areas
Unit-specific
data
Inner Boards Words allocated in Inner Board
(Single CPU Area
Systems or Pro-
Unit-specific data
cess-control
CPU Units only)
5: Peripheral Servicing
Details
Services events for Special I/O Units.
Note Peripheral servicing does not
include I/O refreshing.
Services events for CPU Bus Units.
Note Peripheral servicing does not
include I/O refreshing.
Services events for peripheral ports.
Services RS-232C ports.
Processing time and
I/O refresh time for each Unit
multiplied by the number of
Units used
I/O refresh time for each Unit
multiplied by the number of
Units used
I/O refresh time for each Unit
multiplied by the number of
Units used
Data links for Con-
troller Link and
SYSMAC LINK
Units, DeviceNet
remote I/O for CS-
series DeviceNet
Units, send/receive
data for protocol
macros, and
socket services for
specific control bits
for Ethernet Units
Inner Board I/O refresh time
Processing time and fluctuation cause
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, servicing will
be performed for the set time. At least
0.1 ms, however, will be serviced
whether the peripheral servicing time is
set or not.
If no Units are mounted, the servicing
time is 0 ms.
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, servicing will
be performed for the set time. At least
0.1 ms, however, will be serviced
whether the peripheral servicing time is
set or not.
If the ports are not connected, the servic-
ing time is 0 ms.
Section 9-4
fluctuation cause
359