Omron SYSMAC CS1D-PD Series Operation Manual page 400

Computing the Cycle Time
Parallel Processing with Asynchronous Memory Access (Single CPU Systems Only)
Program Execution Cycle
360
Details
Services Inner Board events (Single CPU
Systems or Process-control CPU Units
only)
Services file access (Memory Card or EM
file memory)
Services communications ports
The program execution cycle time depends on the following conditions.
• Type and number of instructions in the user program (in all cyclic tasks
that are executed during a cycle, and within interrupt tasks for which the
execution conditions have been satisfied).
• Type and number of Basic I/O Units
• Number of SYSMAC BUS Remote I/O Master Units and number of I/O
points on the Slaves
• Type and number of Special I/O Units, CS-series CPU Bus Units, Inner
Boards, and type of services being executed.
• Specific servicing for the following Units/Boards
• Data link refreshing and the number of data link words for Controller
Link and SYSMAC LINK Units
• Remote I/O for DeviceNet (Master) Units and the number of remote
I/O words
• Use of protocol macros and the largest communications message
Section 9-4
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 Inner Boards are mounted, the ser-
vicing 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 there is no file access, 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 no communications ports are used, the
servicing time is 0 ms.