6F3B0253
222 T1-16S User’s Manual
7. Instructions
B+8 Initial status STS
FC840
Initial operation mode
00 : Manual mode
01 : Auto mode
10 : Cascade mode
11 : (Reserve)
Direct / reverse selection
0 : Direct
1 : Reverse
B+9 MV upper limit MH (-25.00 to 125.00 %) Data range: -2500 to 12500
B+10 MV lower limit ML (-25.00 to 125.00 %) Data range: -2500 to 12500
B+11 MV differential limit DMV
(0.00 to 100.00 %/∆t) 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 ∆t = n × constant scan interval
(It is treated as n = 1 when n ≤ 0)
C Manipulation value MV (-25.00 to 125.00 %) Data range: -2500 to 12500
C+1
: Internal work area
C+9
Operation
1. When the instruction input is OFF:
Initializes the PID3 instruction.
Operation mode is set as specified by B+8. A+5 bit 0, 1 ← B+8 bit 0, 1
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.
MV remains unchanged.
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.
Bump-less changing from auto mode to manual mode is available. (Manual mode manipulation value
MMV is over-written by current MV automatically. MMV ← MV)
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