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

Chapter 5 Instruction Words
5 - 40
Variable name Range of values Default Unit Data size Attribute
PID-FB
Process variable
(PV), PID
feedback
monitoring
0 to 9990000 0 0.01 %
Unsigned
2-word data
Readable
- 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 PID-FB >= U(20) then LABEL1 : Compare the monitored data with the
sleep level.
stop : Stop inverter output.
goto LABEL2
LABEL1 FW= 1
LABEL2 goto LOOP
：
(Data area [Data Window])
U(20) = 2000 : Set the PID sleep level of 20% in variable "U (20)".
Variable name Range of values Default Unit Data size Attribute
F-CNV
Scaled output
frequency
monitoring
0 to 3996000 - 0.01
Unsigned
2-word data
Readable
- 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)= F-CNV : Fetch the converted frequency data.
UL(00)= UL(00) * 10000
UL(00)= UL(00) / 1800
YA(0)= UL(00) : Output the data to an analog output.
：
(Parameter)
b086 = 30.0 : Assign the motor speed in Hz to frequency conversion factor variable
"b086".