Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual page 387

CPU Processing Modes
Parallel Processing with Synchronous Memory Access
Peripheral Servicing
Overseeing
Peripheral Event servicing for Special I/O Units Includes event servicing to
servicing
Event servicing for CPU Bus Units
Peripheral port servicing
RS-232C port servicing
Event servicing for Inner Boards (CS
Series only)
Event servicing for communications
ports (internal logic ports) that are
being used (including background
execution)
Note Event servicing to access I/O memory includes 1) Servicing any received
FINS commands that access I/O memory (I/O memory read/write commands
with common codes beginning with 01 Hex or forced set/reset commands with
common codes beginning with 23 Hex) and 2) Servicing any received C-mode
commands that access I/O memory (excluding NT Links using the peripheral
or RS-232C port).
Program Executions
Overseeing
Instruction execution time
Minimum cycle time calculations
Cyclic ser- I/O refresh
vicing
Special I/O refresh
for CPU Bus Units
Peripheral File access
servicing
Event servicing
requiring I/O mem-
ory access (See
note.)
Peripheral Servicing
Overseeing
Peripheral Event servicing for Special I/O Units Except for event servicing to
servicing
Event servicing for CPU Bus Units
Peripheral port servicing
RS-232C port servicing
Event servicing for Inner Boards (CS
Series only)
Event servicing for communications
ports (internal logic ports) that are
being used (including background
execution)
Battery check, user program
memory check, etc.
0.2 ms
(0.18 ms in CJ1-H-R CPU Units)
access I/O memory (See note 3.)
Max. of 1 s for each service.
I/O bus check and other processing
0.3 ms (0.28 ms in CJ1-H-R CPU Units)
Total execution time for all instructions
Processing time for a minimum program execution
cycle time
I/O refresh time for each Unit × Number of Units
Special I/O refresh time for each Unit × Number of
Units
Peripheral service time set in PLC Setup (default:
4% of cycle time)
Battery check, user program
memory check, etc.
0.2 ms
(0.18 ms in CJ1-H-R CPU Units)
access I/O memory (See note 3.)
Max. of 1 s for each service.
Section 6-8
347