Mitsubishi Electric MELSEC FX-2DA User manual

USER'S GUIDE

JY992D52801C

FX-2DA

SPECIAL FUNCTION BLOCK

This manual contains text, diagrams and explanations which will guide the reader in the correct installation

and operation of the FX-2DA special function block and should be read and understood before attempting

to install or use the unit.

Further information can be found in the FX PROGRAMMING MANUAL and FX SERIES HARDWARE

MANUAL.

●The FX-2DA analog special function block has two output channels. The output channels take a digital value

and output an equivalent analog signal. This is called a D/A conversion. The FX-2DA has a maximum

resolution of 12 bits.

●The selection of voltage or current based input/output is by user wiring. Analog ranges of -10 to 10V

(resolution: 5mV), and/or 4 to 20mA (resolution: 20µA) maybe selected.

●FX programmable controllers versions 2.0 or later (those with serial number 13XXXX or larger) are

required; as these units have the TO/FROM applied instructions in their instruction set. Data transfer

between the FX-2DA and the FX base unit is by buffer memory exchange. There are 32 buffer memories

(each of 16 bits) in the FX-2DA.

●The FX-2DA occupies 8 points of I/O on the FX, FX2C expansion bus. The 8 points can be allocated from

either inputs or outputs. The FX-2DA draws 30mA from the 5V rail of the base unit or powered extension

unit.

INTRODUCTION

1.1 External dimensions Weight : Approx. 0.5kg (1.1 lbs) Dimensions : mm (inches)

Any connection to these terminals

may damage the FX-2DA.

125 (4.92)

140 (5.51)

63 (2.48)

73 (2.87) 1

0 (

0.39)

95 (3.74)

Extension cable

and connector 24V LED

D-A LED

*4 Connect the ground terminal on the FX-2DA with

the ground terminal on the base unit of the

programmable controller. Use class 3 grounding

on the base unit, if available.

*1 Use a twisted pair shielded cable for the analog

output. This cable should be wired away from

power lines or any other lines which could induce

noise.

Caution;

(a) The same output channel cannot drive current

and voltage output loads at the same time!

(b) Shorting the voltage output terminals may da-

mage the unit!

FX-2DA special function block

Groove for

35mm (1.38)

wide DIN rail

2-5.5mm (0.22)

hole

M3.5 (0.14)

terminal screws

Wiring

*2 Apply 1-point grounding at the load side of the

output cable (class 3 grounding: 100 Ωor less). If

electrical noise is caused from grounding,

disconnect from grounding.

*3 If electrical noise or a voltage ripple exists at the

output, connect a smoothing capacitor of 0.1 to

0.47µF, 25V.

CH1

DC/DC

converter +15V

AG-15V

+24V

DC24V ±10% 130mA

Extension cable

Class 3

Grounding

(100 Ωor less)

CH2 Current output

Recorder,

etc.

Inverter,

etc.

Voltage output

Voltage or current outputs can be individually selected with each output

terminal. There are a total of 2 output points.

18ms for 2 channels (normal speed), 3.5ms for 2 channels (high speed).

DC -10V to +10V

(external load: 1kΩ

to 1MΩ)

Voltage = -2048 to +2047

±1% full scale (10V range)

Specification

24V DC ±10% 130mA

(external power supply)

5V DC, 30mA

(internal power supply from base unit)

Voltage output

Item

Environment specifications

Specification

Same as those for the FX base unit

Analog circuits

Digital circuits

Item

Max. convertible

output range

Digital input

Overall accuracy

Conversion speed

Resolution

Current output

5mV (10V full scale 1/2000)

DC+4mA to +20mA

(external load: 500 Ω or less)

Current = 0 to +1000

±1% full scale (20mA range)

20µA (20mA full scale 1/1000)

Factory Presets

Load:

= 10kΩΩ

ΩΩ

Ω

(voltage

Output)

= 250ΩΩ

ΩΩ

Ω

(current

Output)

Analog output

+2047

+10V

+ 5V

- 5V

-10V

-2000 -1000

-2048

-10.24V

+10.235V

Digital input

Gain and offset can be adjusted using the procedure described in chapter 4.

0 1000

Analog output

+20mA

+ 4mA

Digital input

INSTALLATION NOTES AND USAGE

3.1 Environment specification

3.2 Power supply specifications

3.3 Performance specifications

Analog output continued...

0 +1000 +2000

Specification

Photo-coupler isolation between analog and digital circuits.

DC/DC converter isolation of power from FX base unit.

No isolation between analog channels.

8 points taken from the FX expansion bus

(can be either inputs or outputs)

Item

Isolation

Number of occupied I/O

points

ATTENTION FOR WHEN SWITCHING SYSTEM ON/OFF

Due to the inevitable timing difference of the DC24V for the analog circuits and other power lines of the

base unit, the output of the FX-2DA special function block may behave erroneously before settling down

to operational conditions in approximately 1sec. Therefore, ensure that this behavior is taken into account

such that the end performance of the system is not degraded.

(example)

Power switch

Miscellaneous

DC24V

supply FX-2DA special

function block

cut analog lines

before switching External analog

machine

BFM

*# 0

*# 1

*# 2

# 3-# 4

*# 5

# 6

# 8-#19

In BFM's (buffer memory) with an “ * ”, data

can be written from the programmable cont-

roller using the TO command.

These BFM's should always be given when the

programmable controller goes from STOP to

RUN. Buffer memory (BFM's) are reset to their

default settings upon power on.

BFM

*#20

#25-#28

#29

#30

#31

*#21

*#22

*#23

*#24

●The buffer memory also handles information

used to adjust the gain and offsets of the FX-

2DA unit. Status of the unit such as errors

are also available.

●From BFM #29 and #30, data can be read

via the FROM command.

●Offset value : the actual output value when

the digital input is 0.

●Gain value : the actual output value when

the digital input is +1000.

contents

channel Initialization (Default = H00)

channel 1

channel 2

Reserved

Last data reset (Default = 0)

Reserved

selection of A-D

conversion speed

see note

Reserved

Gain/offset adjust prohibit

Initial value (0,1)

Offset/gain

setting command G2 O2 G1 O1

Pro-

hibit Permit

b3 b2 b1 b0

Reset all to default default value: 0

Offset data (in mV or µA units)

default value: 0

Gain data (in mV or µA units)

default value: 5,000

Reserved

Error status (See next page)

Identification code K3010 (See next page)

Reserved

*# 7

When set to 0, normal

speed is selected 18ms

When set to 1, high

speed is selected 3.5ms

3.4 Allocation of buffer memories (BFM)

(1) Channel Selection

Switching between voltage and current output modes. The value of BFM #0 switches the analog output

between voltage and current on channels CH1 and CH2. It takes the form of a 2-character HEX number.

The least significant character controls CH1 and the other controls CH2.

Control of each O HEX character of

HOO

O=0 Voltage output (-10V to +10V)

O=1 Current output (+4mA to +20mA)

Example : H10 CH1 : Voltage output CH2 Current output

(a)

(b)

(c)

(d)

(2) Last data reset

If the programmable controller is changed to the STOP state, the FX-2DA will continue to output the last

value. To reset the output to the offset value, set the HEX characters of BFM #5 to one of the appropriate

settings below:

H01 : CH2=Hold, CH1=Reset

H10 : CH2=Reset, CH1=Hold

H11 : CH2=Reset, CH1=Reset

Both channels are held when BFM #5 = H00.

(3) Digital to Analog conversion speed change

By writing 0 or 1 into BFM #7 of the FX-2DA, the speed at which D-A conversion is performed can be

changed. However the following points should be noted:

Note :

●

The conversion speed does not depend on the number of channels being used.

●

On power up, the FX-2DA is set for normal speed conversion and BFM #7 contains 0.

(4) Adjusting Gain and Offset Values

When BFM #20 is set to K1, all settings in the buffer memory are reset to their default settings. This

allows the buffer memory settings to be set from the beginning again when many settings have

been corrupted.

If (b1, b0) of BFM #21 is set to (1, 0), gain and offset adjustments are prohibited. This is to prevent

inadvertent misuse by the operator. To adjust the gain and offset, (b1, b0) of BFM #21 must have

the values (0, 1). The default is set at (0, 1).

Each time a TO instruction is used to send data to BFM #22 (gain/offset setting command), the

designated gain and offsets of each channel (G2 O2 G1 O1) are adjusted with the values in

BFM #23 and #24. This action causes the adjustments to be written to internal non-volatile EEPROM

memory. Limit this action to as little as possible to preserve the life of the EEPROM memory.

Gain and offset values in BFM #23 #24 are set in units of mV orµA. Due to the resolution of the unit,

the actual response will be in steps of 5mV or 20µA.

When any of b1 to b3 is ON D/A conversion

is stopped for the error channel

Offset/Gain data in EEPROM is corrupted or

adjustment error

D/A converter or other hardware failure

FX-2DA MODE switch is not set to READY.

Digital input value or analog output is outside

the specified range.

Bit

b 3 : Hardware error

b 8 : Not READY

b12: Offset/Gain adjust

prohibit

(5) Status information BFM #29

(6) Model code number BFM #30

The identification code for a Special Block is read using the FROM command.

The identification code for the FX-2DA unit is K3010.

The PC can use this facility in the program to identify the special block before commencing any data trans-

fer from and to the special block.

OFF

Hardware normal

READY mode

Permit-(b1, b0) of BFM #21 is

set at (1, 0).

●Values of BFM #0, #5, #21, #23 and #24 are stored in EEPROM memory of the FX-2DA. BFM #23

and BFM #24 are only copied when the gain/offset setting command BFM #22 is used. Also, BFM

#20 causes resetting of the EEPROM memory. The EEPROM has a life of about 10,000 cycles

(changes), so do not use programs which frequently change these BFMs.

●Because of the time needed to write to the EEPROM memory, a delay of 300ms is required between

instructions that cause a change to the EEPROM.

Therefore, a delay timer should be used before writing to the EEPROM a second time.

CAUTION

Bits b4 to b7, b9, b11 and b13 are undefined.

DC 24V power supply failure

Prohibit-(b1, b0) of BFM #21 is set at (1, 0).

No error

Offset/Gain data normal

Power supply normal

Analog output value is normal.

b 0 : error

b 1 : Offset/Gain error

b 2 : Power abnormality

b10: Range error

Offset is the 'Potion' of the calibrated line, identified

at a digital value of 0.

(d) Positive offset

(e) Zero offset – default (4-20mA default is 4mA)

( ) Negative offset

NOTE : If the MODE switch is not set to a channel number, the FX-2DA is regarded as being in the

READY status and no adjustments can be made.

7. Set the FX-2DA MODE switch to READY to complete gain and offset adjustment.

6. Repeat operations 3 to 5 for each channel you wish to use.

5. Press the GAIN button once. The gain value is output. Use the UP/DOWN switch to reach the desired

offset value.

4. Press the OFFSET button once. The offset value is output. Use the UP/DOWN switch to reach the desired

offset value.

3. Set the FX-2DA MODE switch to output CH1.

2. Connect the load and voltmeter or ammeter to the CH1 terminals.

1. Power up the system the FX base unit can be in either RUN or STOP mode.

Offset and gain can be used independently or together. Reasonable offset ranges are -5V to +5V or

-20mA to 20mA, and gain-offset difference 1V to 15V or 4mA to 32mA. Gain and offset can be adjusted by

software in the FX base unit (see program example 2) or by the switches on the FX-2DA (with the aid of a

voltmeter/ammeter).

●Bit device's b0, b1 of the gain/offset BFM (#21) should be set to 0, 1 to allow adjustment.

Once adjustment is complete these bit device should be set to 1, 0 to prohibit any further changes.

●Channel initialization (BFM #0) should be set to the nearest range, i. e. voltage/current etc.

〈〈

〈GAIN〉〉

〉〉

〉〈〈

〈〈

〈OFFSET〉〉

〉〉

〉

Analog

Digital

1000

Gain value

(a) (b)

(c)

Gain is the angle or slope of the calibration line

identified at a digital value of 1000.

(a) Large gain– low reading resolution

(b) Zero gain-– default 5V or 20mA

Analog

Digital value 0

Offset value

Digital

(f)

(e)

(d)

DEFINING GAIN AND OFFSET

In the following example, channel CH1 is set to voltage output, while CH2 is set to current output. The FX-

2DA unit is connected at the position of special function block No.1. If the programmable controller is

changed to the STOP mode, the last data sent will remain and the outputs will hold.

Output

range

normal

5 EXAMPLE PROGRAM

5.1 Basic program

The ID code for the special function block at position

“1”is read from BFM #30 of that block and stored at

D4 in the FX base unit. This is compared to check the

block is an FX-2DA, if OK M1 is turned ON. These

two program steps are not strictly needed to perform

an analog output. They are however a useful check

and are recommended as good practice.

The analog output channels (CH1, CH2) are set up

by writing H10 to BFM #0 of the FX-2DA.

Output data normal

The operational status of the FX-2DA is read from

BFM #29 and output as bit devices at the FX base

unit.

(D0 →BFM #1 (output to CH1))

(D1 →BFM #2 (output to CH2))

M8000

RUN

monitor

K30

K3010

CMP

FROM(P)

K1H10K0K1TO(P)

K4M10

K29

FROM

M18M10

error READY

M20 M3

●Set CH1 setting to D0

(-2,000 to +2,000)

●Set CH2 setting to D1

( 0 to +1,000)

TO(P)

5.2 Using gain and offset in a program

I/O characteristics of the FX-2DA can be adjusted by changing the gain and offset parameters. These can

be changed by the switches of the FX-2DA with the aid of Voltage & Current meters or simply changed by

writting these settings from the programmable controller.

Only the gain and offset values in the memory of the FX-2DA need be adjusted. A voltmeter or an ammeter

for the analog output is not needed. A program for the programmable controller will be needed however.

The following is an example; changing the offset value to 0mA and gain value to 20mA on output channel

CH2 of the FX-2DA connected as block No.1.

Example: Adjusting gain/offset via software settings

X010

H10

K21

K1K0K22K1TO

TO(P)

K23

K24

K22

K21

K20000

RST

●Adjustment start.

●(H10) →BFM #0 (initialize input channels)

In the program shown at left, the programmable

controller should be in RUN status, and MODE

switch of the FX-2DA in the READY position.

●(K1) →BFM #21

BFM #0 should be of HEX value H10, and (b1,

b0) of BFM #21 should be (0, 1).

●(K0) →BFM #22 (offset/adjust)

Reset adjust bits.

T0 K4

●(K20000) →BFM #24 (gain)

●(K0) →BFM #23 (offset)

This statement may be omitted if BFM #23 is already

at its default value.

●(HC) →BFM #22 (offset/gain set)

A delay of 300ms may be needed between setting

BFM #0 and #22 (see section 3.4“caution”)

●Adjustment end.

●(K2) →BFM #21

BFM #21 gain/offset adjust prohibit.

M0SET

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