6F3B0250
7. Instructions
B+8 Initial status STS
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Initial operation mode 00 : Manual mode
01 : Auto mode
10 : Cascade mode
11 : (Reserve)
Direct / reverse selection
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| 0 : Direct |
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| 1 : Reverse | |
B+9 | MV upper limit MH | Data range: | |
B+10 | MV lower limit ML | Data range: | |
B+11 | MV differential limit DMV (0.00 to 100.00 %/Dt) | Data range: | 0 to 10000 |
B+12 | Control interval setting n (1 to 32767 times) | Data range: | 1 to 32767 |
| Executes PID every n scan. Therefore, control interval Dt = n ´ constant scan interval | ||
| (It is treated as n = 1 when n £ 0) |
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C | Manipulation value MV | Data range: | |
C+1 |
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:Internal work area
C+9
Operation
1. When the instruction input is OFF: |
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Initializes the PID3 instruction. | A+5 bit 0, 1 ¬ B+8 bit 0, 1 |
Operation mode is set as specified by B+8. | |
Auto mode SV is set as specified by B+4. | ASV ¬ ISV |
Manual mode MV is set as current MV. | MMV ¬ MV |
Internal calculation data is initialized. |
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MV remains unchanged. |
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2.When the instruction input is ON:
Executes PID calculation every n scan which is specified by B+12. The following operation modes are available according to the setting of A+5.
·Auto mode
This is a normal PID control mode with ASV as set value.
Set value differential limit DSV, manipulation value upper/lower limit MH/ML and differential limit DMV are effective.
240 T1/T1S User’s Manual
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
