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6-4
I/O Response Time
The I/O response time is the time it takes for the PC to output a control signal
after it has received an input signal. The time it takes to respond depends on
the cycle time and when the CPU receives the input signal relative to the in-
put refresh period. The I/O response times for a PC not in a Link System are
discussed below. For response times for PCs with Link Systems, refer to the
relevant System Manual.
The minimum and maximum I/O response time calculations described below
are for where 00000 is the input bit that receives the signal and 00200 is the
output bit corresponding to the desired output point.
00000
00200
The PC responds most quickly when it receives an input signal just prior to
the I/O refresh period in the cycle. Once the input bit corresponding to the
signal has been turned ON, the program will have to be executed once to
turn ON the output bit for the desired output signal and then the I/O refresh
operation would have to be repeated to refresh the output bit. The I/O re-
sponse time in this case is thus found by adding the input ON-delay time, the
cycle time, and the output ON-delay time. This situation is illustrated below.
Cycle time
Input
signal
Output
signal
Cycle
Cycle time
I/O refresh
I/O response time
Output ON delay
Input
ON delay
Instruction
execution
Instruction
execution
Instruction
execution
CPU reads
input signal
Minimum I/O response time = input ON delay + cycle time + I/O refresh time
+ output ON delay
Minimum I/O Response
Time
I/O Response Time
Section 6-4
Summary of Contents for SYSMAC C200H
Page 1: ...OPERATION MANUAL C200H CPU01 E 03 E 11 E SYSMAC Programmable Controllers Cat No W130 E1 05 ...
Page 2: ...C200H Programmable Controllers CPU01 E 03 E 11 E Operation Manual Revised June 2003 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 8: ...TABLE OF CONTENTS ix Glossary 345 Index 363 Revision History 369 ...
Page 342: ...336 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage ...
Page 374: ...Cat No W130 E1 05 C200H Programmable Controllers CPU01 E 03 E 11 E OPERATION MANUAL ...