Hitachi SJ700-4000HFU2

Chapter 4 Explanation of Functions
4-112
4.3.21 Pulse train frequency input
The pulse train frequency input function allows you to use the
pulse train input via the SAP or SAN terminal as a frequency
command or PID feedback data in each control mode. (You can
use this function in every control mode.)
Specify the input frequency corresponding to the allowable
maximum frequency as the pulse train frequency scale (P055).
You cannot use the start/end frequency setting function for external analog input together with this function. To limit
the input frequency, specify the desired values for the pulse train frequency bias (P057) and pulse train frequency
limit (P058).
Item
Function code
Data or range of data
Description
Pulse train frequency scale
P055
1.0 to 50.0 (kHz)
Specification of the input frequency
corresponding to the maximum
allowable frequency
Time constant of pulse train
frequency filter
P056
0.01 to 2.00 (s)
Setting of the filter time constant for
the pulse train input
Pulse train frequency bias
P057
-100. to +100. (%)
Pulse train frequency limit
P058
0. to 100. (%)
Frequency source setting
A001
06
Settings for the frequency input as a
pulse train
PV source setting
A076
03
Operation-target frequency
selection 1
A141
05
Operation-target frequency
selection 2
A142
05
Block diagram for pulse train frequency input
P055: Pulse-string frequency scale
P056: Time constant of pulse-string frequency filter
P057: Pulse-string frequency bias
P058: Pulse-string frequency limit
A002: Frequency source setting
A076: PV source setting
A141: Operation-target frequency selection 1
A142: Operation-target frequency selection 2
Related code
Primary delay filter
÷
1+sT
1
×
Hz
%
%
Hz
Frequency
measurement
Frequency scale (1.0
to 50.0 kHz)
Maximum
frequency (F004)
Bias limitation
Limit
Bias
Frequency
command