Mitsubishi Melsec FX-4AD Manuale utente

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●The FX-4AD analog special function block has four input channels .The input channels receive

analog signals and convert them into a digital value.This is called an A/D conversion.The FX-4AD

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

DC (resolution: 5mV), and/or 4 to 20mA, -20 to 20mA (resolution: 20µA) may be selected.

●FX PC versions 2.0 or later (those with serial number 13OOOO or larger) are required as these

units have the TO/FROM applied instructions in their instruction set. Data transfer between the FX-

4AD and the FX base unit is by buffer memory exchange. There are 32 buffer memories (each of

16 bits) in the FX-4AD.

●The FX-4AD 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-4AD draws 30mA from the 5V rail of the FX base unit or

powered extension unit.

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

and operation of the FX-4AD 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.

INTRODUCTION

USER'S GUIDE

JY992D52601E

FX-4AD

SPECIAL FUNCTION BLOCK

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24V

A-D

POWER

READYCH1

OFFSET

GAIN

CH3

CH2

CH4

V+ COM

I+ FG

CH1

DC24V

I+

COMV+

CH2 CH3 CH4

I+

COMV+

FG I+

COMV+

FG I+

COMV+

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

2TERMINAL LAYOUTS

*1 The analog input is received through a twisted

pair shielded cable. This cable should be wired

separately from power lines or any other lines

which may induce electrical noise.

*2 If a voltage ripple occurs during input, or there is

electrically induced noise on the external wiring,

connect a smoothing capacitor of 0.1 to 0.47µF,

25V.

*3 If you are using current input, connect the V+ and

I+ terminals to each other.

*4 If there is excessive electrical noise, connect the

FG frame ground terminal with the grounded

terminal on the FX-4AD.

*5 Connect the ground terminal on the FX-4AD unit

with the grounded terminal on the base unit. Use

class 3 grounding on the base unit, if available.

73 (2.87")

63 (2.48") 95 (3.74")

140

(5.51")

125

(4.92") Mounting

holes

5.5mm

(0.27in.)

dia.

Extension

cable and

connector

10 (0.39")

M3.5 (0.14")

terminal

screws

35mm

(1.38in.)

DIN rail

mounting

slot

I+ FG FG

V+ COM

I+ I+

COM

V+COM

V+

CH2 CH3 CH4

V+ COM

I+ FG

CH1

DC24V

COM

DC24V

DC/DC

con

verter

CH1

50mA

DC24V

Class 3

Grounding

(100 or less)

CH4

Voltage input

0 to +/-10V

*1 shielded

Current input

0 to +/-20mA

*1 shielded

100K

200K

AG(analog ground)

100K

250K

+15V

-15V

Extension cable

FX-4AD Analog Input Block

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3INSTALLATION NOTES AND USAGE

3.1 General specification

3.2 Power supply specification

3.3 Performance specifications

Analog inputs

Item Specification

General specifications(excluding withstand voltage) Same as those for the FX base unit

Item Specification

Analog circuits 24V DC +/- 10%, 50mA(External power supply from base unit)

Digital circuits 5V DC, 30mA(Internal power supply from base unit)

Item Voltage input Current input

Either voltage or current input can be selected with your choice of input terminal.

Up to four input points can be used at one time.

Analog input range DC -10V to +10V (input resistance:200K Ω). DC -20mA to +20mA (input resistance:250 Ω).

Warning:this unit may be damaged by input

voltage in excess of +/-15V. Warning:this unit may be damaged by input

currents in excess of +/-32mA.

Digital output 12-bit conversion stored in 16-bit 2's complement form.

Maximum value:+2047 Minimum value:-2048

Resolution 5mV (10V default range 1/2000) 20 µA(20mA default range 1/1000)

Overall accuracy +/-1% (for the range of -10V to +10V) +/-1% (for the range of -20mA to +20mA)

Conversion speed 15ms/channel (Normal speed), 6ms/channel (High speed)

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Preset 0 (-10V to +10V) Preset 1 (+4mA to +20mA) Preset 2 (-20mA to +20mA)

Analog inputs continued.....

Digital

Output

+1600

+1000

+32mA+20mA

-1000

-1600

-20mA-32mA

Current

Input

Current

Input

+1750

+1000

+32

+20

Digital

Output

Miscellaneous

Item Specification

Isolation Photo-coupler isolation between analog and digital circuits.

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

No isolation between analog channels.

Number of occupied I/O points 8 points taken from the FX expansion bus (can be either inputs or outputs)

Digital

Output

+10V

+10.235V

Voltage Input

+2047

+2000

-10.24V

-10V

-2000

-2048

NOTE: Preset ranges are selected by an appropriate setting in buffer memory of the analog block.

Current/Voltage input selection must match the correct input terminal connections.

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BFM Contents

*# 0 Channel initialization Default = H0000

*# 1 Channel 1 Contains the number of samples (1 to 4096) to

be used for an averaged result. The default

setting for normal speed is 8.

The default setting for high speed is 1.

*# 2 Channel 2

*# 3 Channel 3

*# 4 Channel 4

# 5 Channel 1 These buffer memories contain the averaged

input values for the number of samples entered

for the channel in buffer memories #1 to #4

respectively.

# 6 Channel 2

# 7 Channel 3

# 8 Channel 4

# 9 Channel 1 These buffer memories contain the present

value currently being read by each input

channel.

#10 Channel 2

#11 Channel 3

#12 Channel 4

#13-#14 Reserved

#15 When set to 0, a normal speed is selected of

15ms/ch (default)

When set to 1, a high speed is selected of

6ms/ch

#16-#19 Reserved

3.4 Allocation of buffer memories (BFM)

In buffer memory locations (BFMs) marked

with an "*" data can be written from the PC

using the TO command.

For buffer memories (BFMs) without the "*"

mark, data can be read to the PC using the

FROM command.

Before reading from the analog special

function block, ensure these settings have

been sent to the analog special function

block. Otherwise, the previous values held

in the analog block will be used.

The buffer memory also gives a facility to

adjust offset and gain by software as well

as by panel switches of the FX-4AD unit.

(see note 3)

Offset (intercept): The analog input value

when the digital output becomes 0.

Gain (slope): The analog input value when

the digital output becomes +1000.

BFM b7 b6 b5 b4 b3 b2 b1 b0

*#20 Reset to Defaults and Preset. Default=0

*#21 Offset, Gain Adjust Prohibit. Default=(0,1)Permit

*#22 Offset, Gain Adjust G4 O4 G3 O3 G2 O2 G1 O1

*#23 Offset Value Default=0

*#24 Gain Value Default=5,000

#25-#28 Reserved

#29 Error status

#30 Identification code K2010

#31 Cannot be used

Selection of A-D

conversion

speedseenote2

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(1) Channel Selection

Channel initialization is made by a 4 character HEX number HOOOO in buffer memory BFM #0.

The least significant character controls channel 1 and the 4 character controls channel 4.

Setting of each character is as follows:

O = 0: Preset range (-10V to +10V) O = 2: Preset range (-20mA to +20mA)

O = 1: Preset range (+ 4mA to + 20 mA) O = 3: Channel OFF

Example: H3310

CH1: preset range (-10V to +10V)

CH2: preset range (+ 4mA to +20mA)

CH3, CH4: Channel OFF

(3) Adjusting Gain and Offset Values

When buffer memory BFM #20 is activated by setting it to K1, all settings within the analog special

function block are reset to their default settings. This is a very quick method to erase any undesired

gain and offset adjustments.

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

changes by the operator. In order to adjust the gain and offset values, bits (b1, b0) must be set to

(0,1). The default is (0,1).

Gain and offset values of BFM #23 and #24 are sent to non-volatile memory gain and offset registers

of the specified input channels. Input channels to be adjusted are specified by the appropriate G-O

(gain-offset) bits of BFM #22 Example: If bits G1 and O1 are set to 1, input channel 1 will be

adjusted when BFM #22 is written to by a TO instruction.

Channels can be adjusted individually or together with the same gain and offset values.

Gain and offset values in BFM #23 #24 are in units of mV or µA. Due to the resolution of the unit the

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

(a)

(b)

(c)

(d)

(e)

By writing 0 or 1 into BFM #15 of the FX-4AD, the speed at which A-D conversion is performed can be

changed. However the following points should be noted:

To maintain a high speed conversion rate, use the FROM/TO commands as seldom as possible.

NOTES: When a conversion speed change is made, BFM #1-#4 are set to their default values immediately

after the change.

This is regardless of the values they held originally. Bear this in mind if a speed change will be

made as part of the normal program execution.

(2) Analog to Digital Conversion Speed Change

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(4) Status information BFM #29

(5) Identification code BFM #30

The identification (or ID) code number for a Special Function Block is read using the FROM command.

The code for the FX-4AD unit is K2010.

The user's program in the PC can use this facility in the program to identify the special function block

before commencing data transfer from and to the special function block.

CAUTION

●

Values of BFM #0, #23 and #24 are copied to EEPROM memory of the FX-4AD. BFM #21 and

BFM #22 are only copied when data is written to the gain/offset command buffer BFM #22. Also,

BFM #20 causes writing to 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 300 ms is required

between instructions that cause a write to the EEPROM.

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

NOTE : • b4 to b7,b9 and b13 to b15 are undefined.

Bit ON OFF

b 0:Error When any of b1 to b4 is ON.

If any of b2 to b4 is ON,A/D conversion

of all the channels is stopped No error

b 1:Offset/Gain error Offset/Gain data in EEPROM is corrupted

or adjustment error. Offset/Gain data normal

b 2:Power source abnormality DC 24V power supply failure Power supply normal

b 3:Hardware error A/D converter or other hardware failure Hardware normal

b 8:Not READY FX-4AD MODE switch is not set to READY READY mode

b10:Digital range error Digital output value is less than -2048

or more than +2047 Digital output value is normal

b11:Averaging error Number of averaging samples is 4097 or

more or 0 or less

(default of 8 will be used) Averaging is normal (between 1 and 4096)

b12: Offset/Gain adjust prohibit Prohibit-(b1,b0) of BFM #21 is set to (1,0) Permit-(b1,b0) of BFM #21 is set to (0,1)

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4DEFINING GAIN AND OFFSET

NOTE:

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

Set the FX-4AD MODE switch to the first channel number.

Apply the offset analog input to the terminal of the channel.

Press the OFFSET button once. The digital offset value (converted from the analog input value) is

stored in the FX-4AD.

Apply the gain analog input to the input terminal of the channel to be adjusted.

Press the GAIN button once. The digital gain value is stored in the FX-4AD.

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

Set the FX-4AD MODE switch to READY to complete gain and offset adjustment.

If the MODE switch is not set to a channel number, the FX-4AD is regarded as being in the READY

status and no adjustments can be made.

Offset is the 'Position' of the calibrated line, identified at a

digital value of 0.

(d) Negative offset

(e) Zero offset - default : 0V or 4mA

( ) Positive offset

Analog

Digital

Offset value

(f)(e)(d)

1000

Digital

(a) (b)

(c)

Gain value

Analog

OffsetGain

Offset and gain can be set independently or together. Reasonable offset ranges are -5 to +5V or -20mA to

20mA, and gain values 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-4AD (with the aid of a voltmeter/ammeter)

●Bit device's b1, b2 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.

●Once adjustment is complete these bit devices 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 determines the angle or slope of the calibration line,

identified at a digital value of 1000.

(a) Small gain-- Large steps in digital readings

(b) Zero gain --- default : 5V or 20mA

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5EXAMPLE PROGRAM

5.1 Basic program

In the following example channels CH1 and CH2 are used as voltage inputs. The FX-4AD block is connected

at the position of special function block No.0. Averaging is set at 4 and data registers D0 and D1 of the PC

receive the averaged digital data.

K0 K30 D4 K1

M8002

Initial

pulse

K2010 D4 M0

K0 K0 H3300 K1

K0 K1 K4 K2

K0 K29 K4M10 K1

K0 K5 D0 K2

M18M10

The analog input channels (CH1, CH2) are setup by

writing H3300 to BFM #0 of the FX-4AD.

The ID code for the special function block at position

"0" is read from BFM #30 of that block and stored at

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

block is an FX-4AD, if OK M1 is turned ON. These

two program steps are not strictly needed to perform

an analog read. They are however a useful check

and are recommended as good practise.

The number of averaged samples for CH1 and CH2

is set to 4 by writing 4 to BFM #1 and #2 respectively.

Do not execute the pulse.

If there are no errors in the operation of the FX-4AD,

then the averaged data BFM's are read.

In the case of this example BFM #5 and #6 are read

into the FX base unit and stored at D0 and D1. These

devices contain the averaged data for CH1 and CH2

respectively.

The operational status of the FX-4AD is read from

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

unit.

READY

error

CMP

TO P

FROM

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