Cycle Time And Time; Cycle Time - Omron WS02-SIMC1-E - V1.9 REV 12-2009 Operation Manual

Cycle Time and Time

9-2 Cycle Time and Time

9-2-1 Cycle Time

Calculating Cycle Time for CS/CJ/CP-series PLC
Process Name
(1) Overseeing Proc-
essing
(2) Computing Process
(3) Minimum Cycle Time
Calculation
(4) I/O refresh
(5) Peripheral servicing
192
The CX-Simulator has its own expansion for the cycle time and the time.
The CX-Simulator has two modes of cycle time: the virtual cycle time and the
computer cycle time. Select from the cycle time mode in the [System Status] |
[Settings] | [PLC Clock Settings] dialog box (Default: the computer cycle time).
Virtual Cycle Time The virtual cycle time assuming that a program is
•
Computer Cycle
•
Time
The cycle time of the CX-Simulator displayed by the CX-Programmer, etc. is
the one in the selected mode.
The cycle time for CS/CJ/CP-series PLC is the sum of each processing time.
Process Contents
I/O bus check, user program memory
check, and clock refresh
Process instructions of a user program.
Sum of the execution time for instruction
words.
Specifying "Minimum Cycle Time" in PLC
Setup waits for cycle time to complete with
the WDT resetting.
Calculate the cycle time.
Perform I/O refresh for Basic I/O Unit,
Inner Board, Special I/O Unit, CPU Bus
Unit, SYSMAC BUS Remote I/O System,
and DeviceNet.
Event service with Special I/O Unit (0 ms
when no Unit is mounted)
Event service with the CPU Bus Unit (0 ms
when no Unit is mounted)
Event service with the Peripheral Port (0
ms when no Unit is connected to the port)
Event service with the RS-232C port (0 ms
when no Unit is connected to the port)
Event service with the Inner Board (0 ms
when no Unit is mounted)
File access service (0 ms when no files are
accessed)
executed on the CS/CJ/CP-series PLC, tentative time
for the actual PLC.
The actual time required for processing one cycle on
the computer.
Cycle time = (1) + (2) + (3) + (4) + (5)
Section 9-2
Processing Time and Fluctuation
Factor
0.5ms
Sum of the instruction execution
time
Approximate to 0 for the time when
"Minimum Cycle Time" is not set.
The additional time for "Minimum
Cycle Time" = The cycle time
specified as "Minimum Cycle Time"
− the computer cycle
time((1)+(2)+(4)+(5))
The I/O refresh time for each Unit
multiplied by The number of Units
used
(For each event service)
If the "Fixed Peripheral Servicing
time" of the PLC Setup is "Dis-
abled", the servicing time will be
4% of the cycle time just before
calculated in (3). If "Enabled", it will
be the specified time. In each case,
the minimum servicing time is 0.1
ms.