Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 255

Processing details
■Deviation check
This function block performs deviation check processing.
DVL
0
-DVL
DVLA
occur
Condition
DVL < |DV|
|DV|  (DVL - DVLS)
DV: Deviation (%), DVLS: Large deviation alarm hysteresis (%), DVL: Deviation limit value (%)
■PIDP operation
• Gain (Kp) is calculated as follows.
Kp = K  PROPORTIONAL
K: Output gain, PROPORTIONAL: Gain
• Output gain (K) is calculated as follows.
Condition
• K value to the deviation (DV) of when the gap width (GW) is equal to 0
DV' (Positive)
0
DV (Negative)
DV'(Negative)
• K value to the deviation (DV) of when the gap width (GW) is
greater than 0
DV' (Positive)
0
DV (Negative)
-GW GW
DV'(Negative)
DV: Deviation (%), GW: Gap width (%) = Rate of the gap width to the deviation, GG: Gap gain
10.12 Position Type PID Control (Disable Tracking for primary loop/Enable Tracking from secondary loop) (M+P_PIDP_EX_)
DVLA DVLA
reset occur
DV (Positive)
When |DV|  GW
GG=1.0
GG=0.5
When |DV| > GW
GG=0.0
DV (Positive)
DVLS
t
DVLS
DVLA
reset
Alarm (ALM)
Large deviation (DVLA)
TRUE (Detected)
FALSE (Reset)
Output gain (K)
K = 1
K = GG
(1-GG)×GW
K=1-
|DV|
10 LOOP CONTROL OPERATION
10
253