CPU Unit Operation Section 9-1
191
9-1-5 Details of I/O Refresh and Peripheral Servicing
CS/CJ-series PLC Type of Service
Contents Target Unit Group
CX-Simulator
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
I/O refresh The data in the
pre-allocated area is
exchanged within the
servicing time without
interruption (time slic-
ing).
Inner Board
I/O refresh is not exe-
cuted because external
I/O Units are not con-
nected to the
CX-Simulator.
CS/CJ-series Special I/O Unit Event Service
(Will be serviced
for the cycles
required.)
CPU Bus Unit
Peripheral Port
Serial Communications Port
Inner Board Bus Service
Periph-
eral
Servic-
ing
Fixed Event ser-
vice
(Will be serviced
for every cycle if
required.)
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.
File Access Service
Execute only servicing
for Network Communi-
cations Unit, Serial
Communications Unit,
and file access within the
servicing time without
interruption (time slic-
ing).
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.
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