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140
Cycle Time
Section 7-1
7-1
Cycle Time
7-1-1
Cyclic Operation and Interrupts
Basic CPU Operation
Initialization is performed when the power is turned ON. If there are no initial-
ization errors, the overseeing processes, program execution, I/O refreshing,
and communications port servicing are performed repeatedly (cyclically).
Note
1.
The cycle time can be read using a Programming Device.
Startup initialization
Overseeing
processes
Program execution
Cycle time
calculation
I/O refreshing
RS-232C port
servicing
•
Check hardware.
•
Check memory.
•
Read data from flash memory (program,
read-only DM data, and PC 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 PC 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.)
•
Read input data from CompoBus/S Remote
I/O Slaves.
•
Write output data to CompoBus/S Remote I/O
Slaves.
•
Exchange I/O data with DeviceNet Master.
(CPM2C-S1
(
0C-DRT versions only)
CompoBus/S
input refreshing
CompoBus/S
output refreshing
DeviceNet
I/O refreshing
•
Perform explicit message communications
with DeviceNet Master.
(CPM2C-S1
(
0C-DRT versions only)
DeviceNet message
communications
Peripheral port
servicing
PC cycle time
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