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(2) P control
P control is a control method in which the manipulated value (MV) is determined proportional to the deviation (E)
between the temperature process value (PV) and set value (SV).
(a) Standard control
The manipulated value (MV) is 50% in the following conditions.
• Temperature process value (PV) = Set value (SV)
• CH Manual reset amount setting (address: 112H, 142H, 172H, 1A2H) is set to 0 (0.0%). (Page 332,
Appendix 3 (21))
Manipulated value (MV)
100%
50%
0%
*1
The value actually output is within the output limiter range set in CH Upper limit output limiter (address: 105H, 135H,
165H, 195H) and CH Lower limit output limiter (address: 106H, 136H, 166H, 196H). (Page 321, Appendix 3 (10))
*2
The set value (SV) is in the center of the proportional band (P).
(b) Heating-cooling control
The manipulated value for heating (MVh) and the manipulated value for cooling (MVc) are both 0% in the
following conditions.
• Temperature process value (PV) = Set value (SV)
• CH Manual reset amount setting (address: 112H, 142H, 172H, 1A2H) is set to 0 (0.0%). (Page 332,
Appendix 3 (21))
100%
0%
*1
The value actually output is within the output limiter range set in CH Heating upper limit output limiter (address: 105H,
135H, 165H, 195H) and CH Cooling upper limit output limiter (address: 1C5H, 1CAH, 1CFH, 1D4H). (Page 321,
Appendix 3 (10))
*1
Set value (SV)
Proportional band (P)
Manipulated value
Manipulated value
*1
for heating (MVh)
for cooling (MVc)
Set value (SV)
Heating proportional
Cooling proportional
band (Ph)
band (Pc)
Temperature process
value (PV)
*2
*1
Temperature process
value (PV)
CHAPTER 8 FUNCTIONS
151
8
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