163
CHAPTER 8 FUNCTIONS
8
8.
3 T
e
mperat
ure Cont
rol
M
ode
(b) Setting change of the remote buffer memory during the execution of auto tuning
If a setting in the following remote buffer memory areas is changed during the execution of auto tuning, the
processing ends in failure.
(c) Out of the temperature measurement range
If CH
Temperature process value (PV) (RWr8 to RWrB) exceeds the temperature measurement range and
either of the following conditions is satisfied, auto tuning ends in failure.
• CH
Input range upper limit (b0 of RWr4 to RWr7): 1 (ON)
• CH
Input range lower limit (b1 of RWr4 to RWr7): 1 (ON)
(d) Time until the temperature process value (PV) reaches the set value (SV) for the first
time or a half the hunting cycle of the temperature process value (PV)
If the time below exceeds two hours, auto tuning ends in failure
• Time from the start of auto tuning until CH
Temperature process value (PV) (RWr8 to RWrB) reaches the
set value (SV) for the first time
• A half the hunting cycle of CH
Temperature process value (PV) (RWr8 to RWrB)
(e) Calculated values of PID constants after auto tuning
If a calculated value of PID constants after auto tuning exceeds one of the following ranges, auto tuning ends in
failure.
• CH
Proportional band (P) setting (address: 102H, 132H, 162H, 192H): 1 to 10000 (0.1% to 1000.0%)
• CH
Integral time (I) setting (address: 103H, 133H, 163H, 193H): 1 to 3600 (1s to 3600s)
• CH
Derivative time (D) setting (address: 104H, 134H, 164H, 194H): 0 to 3600 (0s to 3600s)
If auto tuning ends in failure due to the calculated value of PID constants as described above, the system configuration
needs to be reconsidered (such as selecting proper heater capacity).
(f) Change of the upper limit setting limiter or lower limit setting limiter and the set
value (SV)
If the set value (SV) goes out of the setting range due to the change in one of the following remote buffer
memory areas, auto tuning ends in failure.
• CH
Upper limit setting limiter (address: 10AH, 13AH, 16AH, 19AH)
• CH
Lower limit setting limiter (address: 10BH, 13BH, 16BH, 19BH)
Remote buffer memory area name
Remote buffer memory address
Reference
CH1
CH2
CH3
CH4
CH
Set value (SV) setting
101H
131H
161H
191H
CH
Upper limit output limiter
105H
135H
165H
195H
CH
Lower limit output limiter
106H
136H
166H
196H
CH
Cooling upper limit output limiter
1C5H
1CAH
1CFH
1D4H
CH
Control output cycle setting
10CH
13CH
16CH
19CH
CH
Heating control output cycle setting
10CH
13CH
16CH
19CH
CH
Cooling control output cycle setting
1C6H
1CBH
1D0H
1D5H
CH
Primary delay digital filter setting
10DH
13DH
16DH
19DH
CH
AUTO/MAN mode shift
113H
143H
173H
1A3H
CH
Forward/reverse action setting
115H
145H
175H
1A5H
Cold junction temperature compensation
selection
1E9H
CH
Sensor correction value setting
280H
281H
282H
283H
CH
AT bias setting
2A1H
2A3H
2A5H
2A7H
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