Cycle Time Overview - Omron CJ - 09-2009 Operation Manual

Computing the Cycle Time
Parallel Processing Mode (CJ-H CPU Units Only)
Set error flags.
Flashing:
Non-fatal
ERR/ALM
error
indicator lit or
flashing
Lit: Fatal error

10-4-2 Cycle Time Overview

Normal Processing Mode
458
Checks Unit
connection status
Program Execution
Cycle
Check hardware,
etc.
Check OK?
Execute user
program (i.e., READY
cyclic tasks).
Program
NO
completed?
YES
Wait for specified
cycle time.
Calculates cycle
time.
Refreshes I/O.
Services peripherals.
The 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
• Type and number of Special I/O Units, CPU Bus Units, and type of ser-
vices being executed.
• Specific servicing for the following Units
• Data link refreshing and the number of data link words for Controller
Link and SYSMAC LINK Units
Power ON
Peripheral
Servicing Cycle
Check user program
memory, etc.
Check OK?
Services
peripherals.
Section 10-4