High
−
level Instructions
3
−
774
Precautions on programming
1: When the execution condition has turned on, the area of S4 to S4+29 is initialized.
If it is set to values other than the default values, write with F0(MV) instruction using always on relay
R9010 as execution condition.
2: As operation cycle or timing of PWM output is always operated internally with PID processing instruction,
always operate only once in 1 scan.
Therefore, do not execute it during the subroutin or interrupt program.
This insturction that the same operand has been specified cannot be written more than once.
3: Do not turn off the execution condition during PID processing. Otherwise, PID processing will be
disabled.
4: If you do not want to synchronize PWM output cycle for controlling multiple objects, delay the timing of
start
−
up by adjusting times such as the rise time for start
−
up condition.
5: As execution condition is changed after executing this instruction, after instructions cannot operate
correctly with the program below.
F356 EZPID, WR1, WX2, DT32710, DT100
R1
Y0
F0 MV, k0, DT100
Incorrect
F356 EZPID, WR1, WX2, DT32710, DT100
R1
Y0
It is the same as if there is no
OT Y0 instruction.
F0 MV, k0, DT100
R1
Correct
Conditions when operation errors occur
1: S2: Measured value (PV), S3: Set value (SP), S3+1: KP, S3+2: TI, S3+3: TD
When each parameter of S4+1 to S4+9 is out of the setting range.
2: When the area specified with S3 or S4 exceeds the upper limit of the specified operation device.
Internal operation specifications
When the execution condition has turned on, the operation work is initialized.
If each parameter of KP, TI and TD is all 0 when PID operation has started, they are initialized at 1,1 and 0,
respectively. And the operation is continued.
AT normal done flag or AT done code is cleared on the leading edge of AT signal.
The set value for AT operates regarding <set value (SP)
−
bias value> as target value. Default value for bias
value is 0.
When AT has completed successfully, the results which is calculated by raising KP, TI and TD of calculated
results to the power of correction data a1, a2 and a3 are stored. Default value is 100%.
When AT has completed successfully, AT normal done falg is set, and AT done code is stored in AT step.
When AT has abended, the parameters of KP, TI and TD are not changed.
PWM output is output at the duty when the output range of MV is 0 to 10000.
For analog output (when bit3 of S1 is 1), the internal calculated value output in the range of 0 to 10000 and it is
converted into a specified range.
Conversion formula: (Upper limit value
−
Lower limit value) x internal caluculated value / 10000 + Lower limit
value
Example) When upper limit value = 40000, lower limit value = 0 and internal calculated value = 5000, output
value is 2000.
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