Related code
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

Chapter 4 Explanation of Functions

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

 

 

 

Specification of the input frequency

Pulse train frequency scale

P055

1.0 to 50.0 (kHz)

corresponding to the maximum

 

 

 

allowable frequency

Time constant of pulse train

P056

0.01 to 2.00 (s)

Setting of the filter time constant for

frequency filter

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

Settings for the frequency input as a

Operation-target frequency

A141

05

selection 1

pulse train

 

 

Operation-target frequency

A142

05

 

selection 2

 

 

 

 

Frequency measurement

Hz %

÷

Frequency scale (1.0 to 50.0 kHz)

Bias limitation

 

 

 

Limit

 

 

 

1

%

Hz

Frequency

1+sT

×

 

command

 

 

 

Bias

 

 

 

 

Maximum

 

 

Primary delay filter

frequency (F004)

 

 

 

 

Block diagram for pulse train frequency input

4 - 112

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Image 170
Hitachi SJ700-2 instruction manual Pulse train frequency input, Block diagram for pulse train frequency input