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84
Computing the Cycle Time
Section 2-7
Calculation Example
Conditions:
Input ON delay
1 ms (normal input with input
constant set to 0 ms)
Output ON delay
0.1 ms (transistor output)
Cycle time
20 ms
Minimum I/O response time = 1 ms + 20 ms + 0.1 ms = 21.1 ms
Maximum I/O response time = 1 ms + (20 ms
×
2) + 0.1 ms = 41.1 ms
Input Response
Times
Input response times can be set in the PLC Setup. Increasing the response
time reduces the effects of chattering and noise. Decreasing the response
time allows reception of shorter input pulses, (but the pulse width must be
longer than the cycle time).
PLC Setup
2-7-8
Interrupt Response Times
Input Interrupt Tasks
The interrupt response time for I/O interrupt tasks is the time taken from when
a built-in input has turned ON (or OFF) until the I/O interrupt task has actually
been executed. The length of the interrupt response time for I/O interrupt
tasks depends on the following conditions.
Note
(1) The wait time occurs when there is competition with other interrupts. As
a guideline, the wait time will be 6 to 169
µ
s.
(2) I/O interrupt tasks can be executed during execution of the user program
(even while an instruction is being executed by stopping the execution of
an instruction), I/O refresh, peripheral servicing, or overseeing. The inter-
rupt response time is not affected by which of the above processing op-
erations during which the interrupt inputs turns ON. I/O interrupts,
however, are not executed during execution of other interrupt tasks even
if the I/O interrupt conditions are satisfied. Instead, the I/O interrupts are
Input
Input response time
Input
I/O refresh
CPU Unit
CPU Unit
Input response time
The pulse width is
less than the input
response time, so
it is not detected.
I/O refresh
Name
Description
Settings
Default
Input constants
Input response times 00 hex: 8 ms
10 hex: 0 ms
11 hex: 0.5 ms
12 hex: 1 ms
13 hex: 2 ms
14 hex: 4 ms
15 hex: 8 ms
16 hex: 16 ms
17 hex: 32 ms
00 hex (8 ms)
Item
Interrupt response time
Counter interrupts
Hardware response
Rise time: 50
µ
s
---
Fall time: 50
µ
s
---
Software interrupt
response
Minimum: 134
µ
s
Minimum: 236
µ
s
Maximum: 234
µ
s + Wait
time (See note 1.)
Maximum: 336
µ
s + Wait time
(See note1.)
Содержание CP1L - 12-2007
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Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 428: ...395 Clock Section 6 9...
Страница 429: ...396 Clock Section 6 9...
Страница 523: ...488 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...496 Replacing User serviceable Parts Section 10 2...
Страница 563: ...528 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...576 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...603 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...604 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...634 Index...
Страница 671: ...636 Revision History...