Omron SYSMAC CS Series Operation Manual page 537

Computing the Cycle Time
Details
Services Inner Board events.
Services file access (Memory Card or EM
file memory).
Services communications ports.
Parallel Processing with Asynchronous Memory Access
Program Execution Cycle
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 Inner Boards 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, 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.
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.
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
• Socket services for specific control bits for Ethernet Units and the num-
ber of send/receive words
• Fixed cycle time setting in the PLC Setup
• File access in file memory, and the amount of data transferred to/from file
memory
• Fixed peripheral servicing time in the PLC Setup
The program execution cycle time is the total time required for the PLC to per-
form the 5 operations shown in the following tables.
Processing time and fluctuation cause
Section 10-4
499