User Manual

High−level Instructions
3 − 772
Note) When analog output is used for output, it is not necessary to write OUT instruction immediately after
this instruction.
Also, when analog output is used, PWM output is fixed to off.
(Example) When controlling with the settings that the output upper value (S4+2) is K4000 and the
control cycle (S4+4) is 10 seconds
R1
R3
F356 EZPID , WR1, WX2, DT32710, DT100
R1
S
R1
(DF)
F0 MV , K4000 , DT102
F0 MV , K1000 , DT104
R1
F0 MV , DT100 , WYn
More detail on setting method
1: Setting for 100% output band (S4+3)
100% output band is to specify the timing of starting PID control when measured value (PV) becomes
more than what percentage of set value.
100% output is performed in the area up to a specified measured value.
When measured value (PV) is smaller than set value (SP) *this setting, it has affect on reducing the
arrival time to set value (SP) by performing 100% output.
Therefore, when it is set to k80, 100% output is performed up to 80% of set value (SP), and PID control
starts from then.
When k0 has been set to the default value for this setting, PID control is performed from the beginning.
2: Fine adjustment of auto−tuning
2−1: Correction of the result of auto−tuning (S4+7, S4+8 and S4+9)
When auto−tuning has completed, the parameters for KP, TI and TD are stored in (S3+1, S3+2 and
S3+3).
That result can be corrected with this parameter.
(Example)
Set S4+7 to k200 (means to 200%) and perform auto−tuning to correct KP to double value.
Set S4+8 to K128 (means to 125%) and perform auto−tuning to correct TI to 1.25 times value.
Set S4+9 to k75 (means to 75%) and perform auto−tuning to correct TD to 0.75 times value.