Hitachi SJ700-2 - Manual (Page 178)

Chapter 4 Explanation of Functions
4.3.21 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
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
PV source setting A076 03
Operation-target frequency
selection 1
A141 05
Operation-target frequency
selection 2
A142 05
Settings for the frequency input as
a pulse train
Frequency
measurement
÷
Frequency scale
(1.0 to 50.0 kHz)
% Hz
1+sT
1
×
Frequency
command
Bias
Limit
Bias limitation
Maximum
frequency (F004)
Primary delay filter
Hz %
Block diagram for pulse train frequency input
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