Details Of I/O Refresh And Peripheral Servicing - Omron WS02-SIMC1-E - V1.9 REV 02-2009 Operation Manual

CPU Unit Operation

9-1-5 Details of I/O Refresh and Peripheral Servicing

Type of Service
I/O refresh
Periph- Event Service
eral (Will be serviced
Servic- for the cycles
ing required.)
Fixed Event ser-
vice
(Will be serviced
for every cycle if
required.)
Contents
The data in the
pre-allocated area is
exchanged within the
servicing time without
interruption (time slic-
ing).
Allocate the fixed time
defined by the system
to each service exe-
cute every cycle. If the
processing has com-
pleted within the allo-
cated time, do not
process for the re-
maining time but go to
the next process.
Note
1. The peripheral servicing is not reflected in the virtual cycle time. The
computer time required for processing is added for the computer cycle
time.
2. For the computer cycle time, short computing process time of a ladder
program may cause the cycle time and the execution time to be 0.0 ms.
CS/CJ-series PLC
Target Unit Group
Basic I/O Unit
(including C200H High-density
I/O Unit)
SYSMAC BUS Remote I/O
System and DeviceNet
Special I/O Unit
(for CS/CJ/C200H)
CPU Bus Unit
Inner Board
CS/CJ-series Special I/O Unit
CPU Bus Unit
Peripheral Port
Serial Communications Port
Inner Board Bus Service
File Access Service
Section 9-1
CX-Simulator
I/O refresh is not exe-
cuted because external
I/O Units are not con-
nected to the
CX-Simulator.
Execute only servicing
for Network Communi-
cations Unit, Serial
Communications Unit,
and file access within the
servicing time without
interruption (time slic-
ing).
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