Cycle Time Calculation Example; Online Editing Cycle Time Extension - Omron CP1H CPU Operation Manual

Computing the Cycle Time
2-7-5

Cycle Time Calculation Example

Conditions
Calculation Example
2-7-6

Online Editing Cycle Time Extension

Cycle time rate of increase (%) from pulse output ports 2 and 3 = Output fre-
quency (kHz) × 0.1.
Examples:
30 kHz: Approx. 3%
100 kHz: Approx. 10%
The following example shows the method used to calculate the cycle time when
CP-series Expansion I/O Units only are connected to a CP1H CPU Unit.
Item
CP1H
User program
USB port connection
Fixed cycle time processing
Serial port connection
Peripheral servicing with other
devices (Special I/O Units and
CPU Bus Units)
Process name
(1) Overseeing
(2) Program execution
(3) Cycle time calculation (Minimum cycle time not
(4) I/O refreshing
(5) Peripheral servicing
Cycle time
When online editing is executed to change the program from the CX-Program-
mer while the CPU Unit is operating in MONITOR mode, the CPU Unit will
momentarily suspend operation while the program is being changed. The
period of time that the cycle time is extended is determined by the following
conditions.
• Number of steps changed
• Editing operations (insert/delete/overwrite)
• Types of instructions
CPM1A-40EDR
40-pt I/O Unit
CPM1A-20EDT
20-pt I/O Unit
CPM1A-8EDA
8-pt Output Unit
5 K steps
Yes and no
No
No
No
Calculation
---
0.1 µs × 2,500 + 0.1 µs ×
2,500
set)
0.39 ms × 2 + 0.18 ms ×
2 + 0.08
(Only USB port con-
nected
(1) + (2) + (3) + (4) + (5)
Section 2-7
Details
2 Units
2 Units
1 Unit
LD instructions: 2.5 Ksteps,
OUT instructions: 2.5 Ksteps
Processing time
USB port USB port not
connected connected
0.7 ms 0.7 ms
0.5 ms 0.5 ms
0 ms 0 ms
1.22 ms 1.22 ms
0.1 ms 0 ms
2.52 ms 2.42 ms
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