Delta Electronics Frequency Measurement Card DVP-F2FR User Manual

Page 2

CR NO.

HW LW

Attribute

Factory

setting

Latched

Mode

Function explanation

V1.00 version.

#35~#49 Reserved

#50 R K51 °

1,3

The index of F0 record value (record the number from CR51~130)

#51~#130 R K0 °

1,3

F0 record value (each value occupy 2 group CR)

#131 R K132 °

1,3

The index of F1 record value (record the number from CR132~211)

#132~#211 R K0 °

1,3

F1 record value (each value occupy 2 group CR)

#222~#255 Reserved

The usage of CR varies based on operation mode. Please follow the table above to read or write CR.

In column Attribute, ‘*” means writing is allowed when frequency measurement card is not working.

When the writing value is out of available range, the value of upper/lower bound shall prevail to write once the
value is out of upper/lower bound.

The CR28 and CR29 are the time-out setting for F0 and F1. When setting them to a non-zero value in mode 1,
it will monitor the signal input from F0 or F1 and start a time-out counting. If no signal detected in F0 and F1 with
the time-out counter reaching the setting, it will clear the CR10~CR11 or CR12~CR13 and inform the PLC by
I180 interrupt. Moreover, when CR28 and CR29 are set to zero, the time-out counter will not work anymore.

CR50~CR211 will record the value according to the operation mode. Explanation as follows:

Mode 1

Mode 2

Mode 3

CR51~CR130

To record F0 pulse interval (CR10,

CR11)

N/A N/A

CR132~CR211

To record F1 pulse interval (CR12,

CR13)

N/A

To record F1 pulse interval

(CR25, CR26

The index number of each record is plus 2 for CR50 and CR131 after both registers record on next. Once the
index number reaches to the maximum, it will back to the 1

index number.

It takes about 125us for instruction FROM/TO to read or write a CR of the frequency measurement card. One
more read/write item of CR, 30us more for register.

INSTRUCTION

EXPLANATION

5.1 Instruction Explanation for Frequency Measurement Card

API

FROM

Read Special Module CR Data

Instruction
Explanation

: Number of special module (m1=0~7). Number of frequency measurement card, m1=200.

: Number of CR of special module that will be read.

: Location to save reading data.

: Data number of reading one time.

API

Special Module CR Data Write In

Instruction
Explanation

: Number of special module (m1=0~7). Number of frequency measurement card, m1=200.

: Number of CR of special module that will be read.

: Location to save writing data.

: Data number of reading one time

5.2 Explanation of special D, M and Interrupt:

Device Explanation

Range

D1034

Mode setting of frequency measurement card

D1034 = K1~K3 (Mode 1~Mode 3)

M1019

Flag of mode setting

I180

Frequency measurement card trigger

interrupt

After PLC run at the first scan time, PLC will detect flag M1019 is ON or OFF. If M1019 is ON, PLC will modify
the frequency measurement card’s operation mode based on D1034 setting. Program example as follow is
operation mode 1:

M1002

MOV

D1034

SET

M1019

PLC can use M1019 (flag of operation mode setting for frequency measurement card) and D1034 (flag of
operation mode setting for frequency measurement card) to set operation mode 1 (measurement of pulse
interval) and operation mode 2 (measurement of pulse number) to support Interrupt function I180.

APPLICATION

EXAMPLE

6.1 Pulse Interval Length Measurement

Following the program example of setting operation mode 1 (D1034, M1019) for frequency measurement card.
For F0 and F1, set the time unit of sampling rate is 100ns (D7, D8) and the sampling record number as 20 (D3,
D4). Moreover, I180 will be triggered when F0 or F1 detects a rising or falling edge. PLC can read CR9 via
instruction FROM to decide which channel to detect the signal.

END

IRET

DMOV

D12

D300

D10

FROM K200

K11

DMOV

D300

M1000

M1002

D1034

K200

FROM K200

M1013

I 180

MOV

SET

M1019

MOV

K20

K50

D50

K41

K131

D131

K41

FEND

& D9 K1

& D9 K2

6.2 High-speed Counter

The setting for the following program example:
1. Operation mode: Mode 1.
2. Counting method: Pulse/Direction.
3. Set M0=ON to start counting.

END

M1002

D1034

K200

FROM K200

M1013

MOV

SET

M1019

MOV

K200

K24

K20

D20

K22

D22

6.3 Pulse Number Capture

The following program example is Mode 3 for frequency measurement card. Whenever frequency
measurement card detects the rising-edge in F1, it will trigger the Interrupt I180 of PLC. When PLC execute
Interrupt I180, it will read the content of CR25, 26 of frequency measurement card via instruction FROM.

M1002

D1034

K200

FROM K200

M1013

MOV

SET

M1019

MOV

K200

K20

K131

D131

K40

FEND

FROM

END

IRET

K25

D25

M1000

I 180

6.4 Differential Input Interface

(please refer to the following wiring method)

A+

A-

+24VDC

4.7K

470

Differential
output

NPN

Tansistor

ON MMBT4401LT1G

B+

B-

+24VDC

4.7K

470

Differential
output

NPN

Transistor

ON MMBT4401LT1G

Suggestion: if it is necessary to measure the input signal of frequency measurement card, please connect one
clip of the oscillograph probe to either terminal A- or B- and the other clip of the oscillograph probe to the
ground .

INSTALLATION AND MAINTENANCE

Wiring Method for Frequency Measurement Card

A+

A-

4.7K

Isolating cable

+24VDC

Open collector

output

B+

B-

4.7K

+24VDC

Isolating cable

Open collector
output

There is a SDSP1 indication LED in the front end of the DVP-F2FR frequency measurement card. When power
on the PLC MPU, the LED will light up (green). If the LED doesn’t light up with power on, it means that there is
error with the card. Please power off the PLC and re-install the card again.

Before power on the system, please check A/B phase loop and make sure they connect to the input terminal
with correct electrical level.