Mitsubishi Electric MELSEC iQ-R Series User Manual page 247

CH1 Proportional band (P) setting
Set the proportional band (P) to execute the PID control.
The proportional band (P) is the deviation width of the deviation (E) necessary for the manipulated value (MV) to vary within
the range of 0% to 100%.
In a proportional action, the relation between changes in the deviation (E) and the manipulated value (MV) can be expressed
as follows:
MV=K • E
P
K is a proportional gain. The following formula shows the proportional band (P).
P
1
P= • 100
K
P
When the value of the proportional band (P) increases, the proportional gain (K
manipulated value (MV) becomes small compared to the variation of the deviation (E).
When the value of the proportional band (P) decreases, the proportional gain (K
manipulated value (MV) becomes large compared to the variation of the deviation (E). The following figure shows the
proportional band (P) in a reverse action.
Manipulated value
(MV)
100%
Manipulated
value (MV) to
deviation (E)
0%
Current temperature
process value (PV)
Proportional band (P)
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory area name
CH Proportional band (P) setting
CH Proportional band (P) setting (in the Q compatible mode)
Deviation
(E)
Set value
(SV)
) decreases. Therefore, the variation of the
P
) increases. Therefore, the variation of the
P
Temperature
process value
(PV)
CH1 CH2
431 631
35 67
Appendix 3 Buffer Memory Areas
CH3 CH4
831 1031
99 131
APPX
245
A