Omron SYSMAC CS1D-PD Series Operation Manual page 402

Computing the Cycle Time
Parallel Processing with Synchronous Memory Access (Single CPU Systems Only)
Program Execution Cycle
Peripheral Servicing Cycle
Time
362
The program execution cycle time depends on the same conditions as the
Normal Mode. Partial peripheral servicing ((5) below), however, is restricted
to servicing for file and I/O memory access.
The program execution cycle time is the total time required for the PLC to per-
form the 5 operations shown in the following tables.
Cycle time = (1) + (2) + (3) + (4) + (5)
(1) Overseeing I/O bus check, etc.
(2) Program exe- Same as for Normal Mode.
cution
(3) Cycle time Waits for the specified cycle time.
calculation
(4) I/O refreshing Same as for Normal Processing Mode. Same as for Normal
(5) Partial periph- Servicing file access (Memory Card or
eral servicing EM file memory)
Performs
services for
the events
give at the
right that
requires I/
O memory
access
The peripheral servicing execution cycle time depends on the same condi-
tions as the Parallel Processing with Asynchronous Memory Access. Periph-
eral servicing ((2) below), however, is restricted to servicing that does not
access I/O memory.
The peripheral servicing cycle time is the total time required for the PLC to
perform the 2 operations shown in the following tables.
Cycle time = (1) + (2)
Name
(1) Overseeing Checks user program memory,
processing checks for battery errors, etc.
(2) Peripheral Performs
servicing services for
the events
give at the
right,
excluding
those that
require I/O
memory
access.
Details
Events with CS-series
Special I/O Units (does
not include I/O refreshing)
Events with CS-series
CPU Bus Units (does not
include I/O refreshing)
Peripheral port events
RS-232C port events
Events with Inner Boards
Events using communica-
tions ports
Processing
Events with CS-series
Special I/O Units (does
not include I/O refresh-
ing)
Events with CS-series
CPU Bus Units (does
not include I/O refresh-
ing)
Peripheral port events
RS-232C port events
Events with Inner
Boards
Events using communi-
cations ports
Section 9-4
Processing time and
fluctuation cause
0.3 ms
Same as for Normal
Mode.
Same as for Normal
Mode.
Mode.
Same as for Normal
Mode.
Processing time and
fluctuation cause
0.4 ms
1.0 ms for each type of
service
If servicing ends before
1 ms has expired, the
next type of servicing
will be started immedi-
ately without waiting.