APPENDIX
Appendix 3 Processing Time
(1)Time required to process communication using the non procedure protocol (guideline)
The processing time for the Output and Input instructions can be estimated by the following formula. Note, however, that the processing time may become longer depending on other communication functions (e.g., communication using the MC protocol) and special functions (e.g.,
The value obtained from the following formula should be used as a guideline for the processing time when reception or transmission only is performed using only CH1
(a) Output instruction
Tp = St + (Dle/Cr 1000 + 0.07) | Ds + T1 | ||||||||||||
Tp ( | 1) | : The time from the start of execution of the Output instruction | |||||||||||
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| completion of the Output instruction execution (ms) | ||||||||||
St |
| : Scan time |
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Dle |
| : Data length of 1 byte at data transmission (number of bits) | |||||||||||
Cr |
| : Communication rate (bps) | |||||||||||
Ds |
| : Number of bytes of transmission data | |||||||||||
T1 |
| : QJ71C24N | T1 = 3.0 | ||||||||||
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| QJ71C24 |
| T1 = 4.86 | ||||||||
1 | This stands for the time range of processing (Tp). | ||||||||||||
Start of the Output |
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| Start of the End processing of | |||||||||
instruction execution | Tp |
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| the Output instruction execution | ||
Step 0 | END |
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Sequence program |
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Transmission command |
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Output instruction |
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| OUTPUT |
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Output instruction |
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complete device |
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Q series C24 side
Transmission data
External device side
[Calculation example]
Estimate the time required to process the Output instruction when transmitting 100 bytes of data using the non procedure protocol with the QJ71C24N. (Unit: ms)
• Scan time | : | 10 ms | ||
• Data length | : | 10 bits (1 start bit, 8 data bits, 1 stop bit, no parity | ||
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• Communication rate : | 19200 bps | |||
10 + (10/19200 | 1000 + 0.07) 100 + 3.0 |
| 72.08 (ms) | |
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App. - 14 |
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| App. - 14 |