Pid-Fb; F-Cnv - Hitachi SJ700-2 Series Instruction Manual

Chapter 5 Instruction Words
Variable name
Process variable

PID-FB

(PV), PID
feedback
monitoring
- Explanation
This variable can be used to monitor PID feedback data in the inverter. The data monitored with this
variable corresponds to the data monitored by the process variable (PV), PID feedback monitoring
function (d004). This variable is read-only.
- Sample program: Program to stop inverter output when PID feedback data falls below the sleep level
(to manage sleep status)
(Code area [Code Window])
：
LOOP if
stop
goto
LABEL1 FW=
LABEL2 goto
：
(Data area [Data Window])
U(20) = 2000
Variable name
Scaled output

F-CNV

frequency
monitoring
- Explanation
This variable can be used to monitor the converted output frequency of the inverter. The data monitored
with this variable corresponds to the data monitored by the scaled output frequency monitoring function
(d007). This variable is read-only.
- Sample program: Program to output the motor speed data to a general-purpose analog output.
(Code area [Code Window])
：
UL(00)=
UL(00)=
UL(00)=
YA(0)=
：
(Parameter)
b086 = 30.0
Range of values
0 to 9990000
PID-FB >= U(20)
LABEL2
1
LOOP
: Set the PID sleep level of 20% in variable "U (20)".
Range of values
0 to 3996000
F-CNV
UL(00) * 10000
UL(00) / 1800
UL(00)
: Assign the motor speed in Hz to frequency conversion factor variable
"b086".
Default Unit
0 0.01 %
then LABEL1 : Compare the monitored data with the
sleep level.
: Stop inverter output.
Default Unit
- 0.01
: Fetch the converted frequency data.
: Output the data to an analog output.
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Data size Attribute
Unsigned
Readable
2-word data
Data size Attribute
Unsigned
Readable
2-word data