Operand Parameter
name
Setting
range
Setting method
[S2]
Process
value (PV)
K -30000 to
K 30000
Input the current value for process control amount using an analog
input unit, etc.
It is also possible to directly specify the input data area WXn of the
analog input unit.
[S3]
Set point
value (SP)
K -30000 to
K 30000
Set a target value for process control amount.
Set the value using an instruction or an external device (e.g. display).
[S3+1]
Proportional
gain (Kp)
U1 to U9999
(0.1 to
999.9)
Specify parameters used for PID operation.
Each parameter is obtained by multiplying the set point value by 0.1.
When auto-tuning is executed, the relevant data are stored upon its
completion.
[S3+2]
Integral time
(Ti)
U0 to
U30000
(0 to 3000 s)
[S3+3]
Derivative
Time (Td)
U0 to
U10000
(0 to 1000 s)
(Note 1) It is recommended to allocate the [S1] area to a non-hold type operation memory area (WR) where a
bit operation is available.
(Note 2) It is recommended to allocate the [S2] area to a non-hold type operation memory area.
(Note 3) It is recommended to allocate the [S3] through [S3+3] areas to a hold type operation memory area.
(Note 4) If the [S3+1] through [S3+3] areas are all "0" when the EZPID instruction is started up, operation is
continued with the settings where proportional gain (Kp) is 1, integral time (Ti) is 0, and derivative time
(Td) is 0.
■
Setting of parameters [S4] to [S4+29]
Operand Parameter name Default Setting range Setting method
[S4]
Manipulated
value (MV)
K0
K -10000 to K
10000
The result of PID operation is stored.
If PWM output is selected in bit 3 of [S1], calculation
is carried out in the range 0 to 10000, as the duty
ratio (0 to 100%) of PWM output.
If analog output is selected in bit 3 of [S1], the value
given by the following formula is stored.
(Output upper limit - Output lower limit) x Internal
calculated value / 10000 + Lower limit
Use the user program to convert the stored value
into the range of the analog output unit.
[S4+1] Output lower limit K0 K-10000
≤ Lower limit
< Upper limit
≤ K 10000
Specify the output value (MV) range. Values for the
specified range are output.
[S4+2]
Output upper
limit
K10000
[S4+3]
100% output
zone
U0
(0%)
U0 to U80
(0% to 80%)
Specify the level of process value (PV), as
percentage to set point value, above which PID
control should be initiated. Until the specified
process value (PV) is reached, the manipulated
value (MV) is retained at 100%. If the process value
(PV) is smaller than the set point value (SP), this
shortens time until reaching the set point value (SP).
When the set point value is U80, the output level is
retained at 100% until the process value (PV)
10.12 EZPID (PID Operation: PWM Output Available)
WUME-FP7CPUPGR-12 10-47
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