Cyclic Operation And Interrupts - Omron SYSMAC CPM2B Operation Manual

Structure and Operation
1-3-5

Cyclic Operation and Interrupts

Basic CPU Operation
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Initialization processing is performed when the power is turned on. If there are
no initialization errors, the overseeing processes, program execution, I/O
refreshing, and communications port servicing are performed repeatedly
(cyclically).
Startup initialization
Overseeing
processes
Program execution
Cycle time
calculation
I/O refreshing
RS-232C port
servicing
Peripheral port
servicing
The cycle time can be read from a Programming Device.
AR 14 contains the maximum cycle time and AR 15 contains the present
cycle time in 4-digit BCD.
• Check hardware.
• Check memory.
• Read data from flash memory (program,
read-only DM data, and PLC Setup settings).
• Check for battery error.
• Preset the watch (maximum) cycle time.
• Check program memory.
• Refresh bits for expansion functions.
• Execute the program.
(Refer to the Programming Manual (W353) for
details on cycle time and I/O response times.)
• Wait for minimum cycle time if a minimum
cycle time has been set in the PLC Setup
(DM 6619).
• Calculate cycle time.
• Read input data from input bits.
• Write output data to output bits.
• Perform RS-232C port communications
processing. (Can be changed in DM 6616.)
• Perform Peripheral port communications
processing. (Can be changed in DM 6617.)
Section 1-3
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