User`s manual

App - 19 App - 19
MELSEC-Q
APPENDIX
Appendix 3.2 Operation processing time of 2-degree-of-freedom PID control
loop
This section gives an example of the operation constant of each instruction and the processing
times taken when actual values are stored into the loop tag memory.
(1) Loop type and used instructions
(a) Loop type: S2PID
(b) Used instructions: S.IN, S.PHPL, S.2PID, S.OUT1
(2) Operation constants
(a) S.IN instruction
Name Item Setting
Engineering conversion upper limit EMAX 100.0
Engineering conversion lower limit EMIN 0.0
Input upper limit NMAX 100.0
Input lower limit NMIN 0.0
Upper limit range error occurrence HH 95.0
Upper limit range error return H 80.0
Lower limit range error return L 20.0
Lower limit range error occurrence LL 5.0
(b) S.PHPL instruction: Without operation constant
(c) S.2PID instruction
Name Item Setting
Derivative gain MTD 4.0
Deviation large alarm hysteresis DVLS 3.0
Operation mode PN 0
Tracking bit TRK 0
Set value pattern SVPTN 3
(d) S.OUT1 instruction
Name Item Setting
Output conversion upper limit NMAX 100.0
Output conversion lower limit NMIN 0.0