Digital Transducer-Electronicsdownload.gongkong.com/file/2006/10/7/AED9301a.pdf · transducer...

Operating manual

DigitalTransducer-Electronics

AED 9301A

Part 1,Profibus basic device

AED9301A / Part 1 / Basic device

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Part 1Description of the hardware of the AED9301A-basic device

Contents Page

Safety Notes ...................................................................................................... 31 Introduction and Use ................................................................................. 42 Mechanical construction........................................................................... 53 Electrical connection ................................................................................ 7

3.1 Transducer connect. AED9301A with AD103 or AD101B .................... 73.2 Connection of the operating supply voltage........................................ 123.3 Profibus connection ............................................................................ 133.4 Connection digital inputs/outputs........................................................ 163.5 Cable connection AED 9301A via PG unions.................................... 20

4 Technical data of the basic device AED9301A...................................... 21

Part 2Description of the hardware and the functions of the measurement amplifierboard AD103 or AD101B

Part 3Description of the commands for the serial communication with themeasurement amplifier board AD103 or AD101B

Part 4Description of the commands for dosing / filling control with the measurementamplifier board AD103

Part 5Description of the Profibus communication


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Important notesWithout our express approval, the device must not be modified in terms of itsdesign and/or technical safety aspects. Any modification excludes any and allliability on our part for any damage resulting therefrom.In particular, it is prohibited to carry out any repairs, soldering work etcwhatsoever on the boards and to exchange components. Repairs may only becarried out by HBM.The complete factory settings are stored nonvolatile in the measurement boardAD101B and cannot be deleted or overwritten; they can be reset at any time bymeans of the command TDD0.You will find further information in the chapter ‘Individual descriptions of thecommands’ AD101B, AD103; Part 3.The manufacturing number set in the factory should also not be changed.The transducer must always be connected up (connect transducer or bridgemodel).


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Safety Notes

• Normally, the product does not represent any hazard if the notes andinstructions for project planning, assembly, use within specifications andmaintenance are complied with.

• The relevant accident prevention regulations, as applicable in each individualcase, must be complied with.

• Assembly and commissioning may only be carried out exclusively byqualified personnel.

• Prevent dirt and humidity from ingressing into the inside of the equipment.• When connecting lines implement measures against electrostatic discharges

which may cause damage to the electronics.• For power supply, a small voltage (18...30V) with safe disconnection from

mains is required.• When connecting additional units, the safety regulations according to

EN610101) must be complied with.• Use shielded lines for Profibus and transducer connections. The screen is to

be connected flush to ground on both sides. Lines for connecting the power

supply as well as the digital I/Os are to be implemented as shielded lines only

if a cable length of 30m is exceeded or if lines are laid outside enclosed

buildings.

1) "Safety regulations for electrical measurement, control, regulatory, and laboratory units"


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1 Introduction and Use

The digital transducer electronic units AED9301A belong to the family of AEDcomponents which digitally condition and network as bus-capable signals frommechanical measured value transducers.This includes digital measurement amplifier boards, base units with RS-485 orProfibus DP interface and intelligent sensors with integrated signal processing.The objective of these components is the digitization and conditioning of themeasuring signals directly at the transducer location. Via the digital transducerelectronics AED9301A, SG1) transducers can be connected directly to aProfibus DP within a full bridge circuit. This enables you to build up completemeasurement chains – fast and at low cost.

AED9301basic: = Basic device AED9301A + Amplifier AD101BAED9301plus: = Basic device AED9301A + Amplifier AD103

The digital inputs and outputs offer• the controling of processes via two limit values (LIV1/2),• the detrmination of triggered measing values (MAV), and• the controling of a filling or dosing process (only AD103)

The transducer electronic units AD101B and AD103 are also abbreviated withAED in the following text.

1) Strain Gages


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2 Mechanical construction

The basic device AED9301A offers the following functions:• Degree of (mechanical) protection (IP65)• Slot for measurement amplifier board AD101B or Ad103• Voltage supply for the measurement amplifier board and transducer supply

(potential-isolated)• Total bridge resistance transducer >80Ω ...4000Ω

• Profibus DP interface (potential-isolated) from measurement amplifier andfrom the digital inputs / outputs)

• Digital inputs/outputs (potential-isolated from measurement amplifier andfrom Profibus)

• EMC protection

The measuring amplifier board is designed as a plug-in type board, which canbe plugged into the carrier board of the basic unit via a 25pin D connector. Thebasic device comprises the terminals for transducer, power supply unit, digitalinputs outputs and profibus connection, the slide switches for bus connectionand end-resistors, as well as the voltage stabilizer. The connection cables arefed out of the side of the housing, via PG boltings.


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Fig. 2-1: Mechanical construction AED9301A (without measurement amplifier)

Connector meas. Amplifier

Profibus-LEDs

LED 4: red LED 1LED 3: yellowLED 2: green

Transducer-connection

Adress-setting

Profibus-connection

Bus termination anddiagnosis switch

Voltage supplyand digital I/O


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3 Electrical connection

A connection diagram is enclosed with the basic unit AED 9301A. When makingconnections, please ensure that the cable wires do not protrude beyond theconnection terminals (risk of short circuits).Please also ensure that the cable shield is correctly connected to the PG bolting(see Chapter 5.5).

3.1 Transducer connect. AED9301A with AD103 or AD101B

Important noteThe transducer must always be connected up (connect transducer).

AED9301A with AD101BIt is possible to connect strain gage transducers in a full bridge circuit with atotal bridge resistance of RB = 80...4000 Ω . The bridges are supplied by meansof the basic device AED9301A (5V DC).

Sense line (-)

Sense line (+)

Bridge supply voltage (-)

Meas. signal (-)

Bridge supply voltage (+)

Cable shield on housing

Meas. signal (+) white

black

red

blue

green

Wirecolour

grey

33’412’2

Pin

Fig. 3.1-1: Transducer connection in 6-wire technology (colour coding HBM)

The 6 wire connection avoids a long cable influencing the measured value.When using several transducers and a junction box, the 6-wire technology isrouted through to the junction box.


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Fig. 3.1-2: Transducer connection KL 4 in the basic device AED9301A as 6-wire connection(Wire colours: BU – blue, GN - green, RD – red, WH – white, GY – grey, BK – black)

For transducers that are calibrated in four-wire-technology, there are two typesof connection:• Connection via a six wire extension cable; sensor line bridged in transducer

connector )

Transducer bl rt ws sw

rtwsgr

bl

sw

Connector

Cable totransducer electronics

Cable shield

gn

Fig. 3.1-3: Transducer connection in four-wire technology via six-wire cable extension (HBMcolours)

KL4

GN RD WH GY BKBU

22’ 1 4 3’ 3

Load cell


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• Connection without an extension cable; sensor line bridged on thetransducer electronics ( connect 3 to 3‘ and 2 to 2‘ )

When connecting several transducers, it is recommended to use a junction boxVKK4 or VKK6 by HBM. In general the supply lines to the AED should beimplemented as shielded lines.

Notes on connection type, cable length and cable cross-section:Depending on the bridge resistance of the transducer used, cable length, andcable cross-section of the load cell connection cable, voltage drops arise thatlead to a reduction in the bridge supply voltage. Additionally, the voltage dropon the connection cable is also temperature-dependent ( copper resistance ).The load cell output signal also changes in proportion to the bridge supplyvoltage.

Effect on the measurement result with AUTOCAL (command ACL1)activated:6-wire circuit (standard operation mode):With the 6-wire-circuit the return lines 2´ and 3´ in the load cell ( for load cellswith 6-wire-connection) or directly on the load cell connection ( for load cellswith 4-wire circuit) with the supply lines 2 and 3 bridged (Fig.3.1-2 ). Thiscorrects all influences. Even a change of cable length following a calibrationdoes not lead to any deviations in the measurement results.

4-wire circuit:With the 6-wire-circuit the return lines 2´ and 3´ on the connection terminals 2and 3 are connected directly to the AED (Fig.3.1.3 ). As the correction byAUTOCAL can only be effected up to the return points 2´, 3´, all changes incable resistance are reflected in the measurement result. That is, even if the 4-wire cable used for a calibration is no longer changed, there still resultmeasurement errors in conditions with changing temperatures, caused by thetemperature-dependent cable resistance and possibly also by transitoryresistances in the connectors.


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Replacement circuit for the bridge with bridge resistance RB and thesupply lines with line resistances RL1 and RL2:

From the bridge resistance RB and the line length I, line cross-section A and thebridge supply voltage, the voltage across the supply lines of the bridge can bedetermined:

UB + URL1 + URL2 = UBR

For RB = 80Ω, RL1 = RL2 = 1.6Ω (l = 10m) and UBR = 5Vthere results a a supply current IBR = UBR / (RL1 + RL2 + RB) = 60mAand thus a voltage drop across the two line resistors of a total approx. 0.2V(UBridge = 4.8V).

For RB = 80Ω, RL1 = RL2 = 16Ω (l = 100m) and UBR = 5Vthere results a a supply current IBR = UBR / (RL1 + RL2 + RB) = 45mAand thus a voltage drop across the two line resistors of a total approx. 1.4V(UBridge = 3.6V).

For the 6-wire circuit, this is without significance as the voltage drop is takeninto account via the sensor lines in the measurement signal.

RL1

RL2

RB UBR

RL1= RL2: = (4 x ρCU/π) x (l[m] / A[mm2]

ρCU = 0,0178 [Ωmm2/m] for copper

π = 3.14 l = line length, A = line cross section

→ RL1 = RL2 = 1.6Ω at l = 10m and A = 0.14mm2


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However, for the 4-wire circuit, the dependence of the copper resistance of thelines directly influences the measurement result via the temperature, as thebridge supply voltage UBridge changes:

RL(t) := RL20 ∗ (1 + α ∗ (t – 20°C)),

with RL20 being the line resistance at 20°C and α being the temperaturecoefficient of copperRL20 – Calculation see page 11, αCU:= 0.00392 [1/K]

For a line length of l= 100m and a temperature difference of 10°C the followingline resistance resultsRL1(t) = RL2(t):= 16 ∗ (1 + 0.00392 ∗ 10) = 16.6 Ω

This changes the bridge supply voltage from UBridge = 3.6V (at 20°C) to UBridge = 3.53V.

This change in the bridge supply voltage directly at the transducer changes themeasured signal of the bridge by 2% ( = 100% ∗ (1 – 3.53V / 3.6V)).This exemplary calculation shows that for long line lengths only 6-wiretechnology may be used.


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3.2 Connection of the operating supply voltage

The voltage supply must meet the following requirements:

AED9301A supply voltage range UB = +18V ... +30V (DC)Current consumption = 200mA + current of control outputsOUT1..4 (for 80Ω Bridge / 24V supply, see technical dataChapter 6)

Fig. 3.2-1: Connection of voltage supply UB

The AED supply voltage can be connected at the terminals KL1 or KL2. Thethree ground terminals as well as the two voltage terminals, respectively, areinternally connected. The supply voltage coming from the power supply unit isconnected to terminal KL1; at terminal KL2 this supply voltage can be fed on toother units.The potential-isolated digital outputs OUT1..OUT4 are also supplied from thisvoltage. Potential-separation is effected in the direction of the AED. Thus, theunits controlled by OUT1..4 can also be supplied from UB (see Section 5.4)

UB

UB

+1830V

UB

UB

KL2

KL1

Digital I/ O

external PSU

UBIN

24 V other 0 V units

24VDC

0V


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The control inputs IN1 and IN2 are initially potential-separated from the supplyvoltage UB. The two grounds (ground UB and ground IN) can be connected toterminal KL1, if required (see Section 5.4).

3.3 Profibus connection

The Profibus DP is completely standardized in accordance with IEC 61 158 /EN 50 170 for universal automation; this provides for the troublefree connectionof standard components.In the case of the AED9301A, the Profibus is a DP Slave according to DIN19245-3. It offers a simple and fast to implement way in which to connectelectro-mechanical measured value transducers with automation systems suchas e.g. SIEMENS SIMATIC S7 or PCs.The Profibus is potentail-isolated separated from the measuring system andfrom the supply voltage, the transfer process is RS485. The maximum possiblebaud rate for RS485 is 12 Mbaud. The subscriber address can be set by meansof two BCD coded rotary switches S5 and S4.The Profibus connection KL3 is equipped with four terminals so that it can befed through to the next bus subscriber. The connection lines should beimplemented as shielded and twisted 2-wire lines (see Profibus cablespecification).At both ends of the Profibus line, the bus termination must be activated (with theAED switch S2 = on). For all other bus subscribers this switch is to be set to'off'. For diagnosis purposes the module can be disconnected from the Profibus(S3 = off), the works setting is ‚on‘.


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Fig. 3.3-1: Profibus - connection via terminal KL3

Maximum cable length in relation to the baud rate:

Baud rate[kBit/s]

9.6 19.2 93.75 187.5 500 1500 12000

Max. Cablelength [m]

1200 1200 1200 1000 400 200 100

Setting the Profibus address: Address = S5 x 10 + S4 (permitted adress range: 3...99)The address is to be set with the unit in a deactivated condition and is read infrom the AED when supply voltage is applied. The address is set to 03 at thefactory.

S3

Bus conn.on

off

S2

Bus term.

on off 0 1

2 3

4 5 6 8 9 7

0 123

456

89

7

S4S5

00 99------

KL3

A B A BIN OUT

Profibus

from Master next unit


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Function of light emitting diodes (LEDs)Different Profibus states are indicated by 4 LEDs (Fig. 2-1)

LED1: Voltage supply (green, r/h next to the diagnosis switch)supply voltage of the RS485 driver is applied, if LED 1 isconstantly illuminated in green.

LED2: Profibus Data Exchange (green)The 'Data Exchange' state is indicated by the green LED 2 incyclic data exchange.

LED3: Profibus Diagnosis (yellow)The yellow LED 3 illuminates if there is an internal fault. Themeasured values are possiblyinvalid.

LED4: Profibus Error (red)In the event of a bus error, LED 4 will illuminate in red for as longas the error state exists.Possible causes of the fault:- Incorrect wiring (A and B poss. mixed up)- Profibus Master does not (yet) operate

Installation of the Profibus:

1. Connection of the supply lines to the AED when deactivated (acc. toChapters 5.1 to 5.5). Via KL3, the Profibus line is fed through from one unitto the next.

2. Setting the subscriber address via S5, S4.

3. Set switch for connecting in the bus termination (S2) to 'on' only for the firstand last units; otherwise leave in position 'off'. If the first or last bussubscriber is not an AED, then it is usually possible to connect in the bustermination by means of a slide switch on the housing of the Profibusconnector.

4. Check whether the switch for the bus connection (S3) is set to ‚on‘ .

5. Switch-on of the supply voltage UB.

6. Configuration and parameterization of the Profibus subscriber with therespective tools.


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The configuration and parameterization of the Profibus telegram by means of aconfiguration tool and GSD file is described in the operating instructions, Part 5(communication via Profibus with AED9301A), as well as the bus coupling viaPC and the HBM Profibus Panel Program.For diagnosis purposes the Profibus can be disconnected from the AED (busconnection (S3) to 'off')

3.4 Connection digital inputs/outputs

At the terminals KL1 and KL2, the digital control inputs and control outputs –and their associated reference grounds – are connected up.The amplifier is allways disconnected potentially from supply voltage UB and theigital inputs and outputs.

Control inputs:The control inputs IN1 and IN2 are initially isolated from the supply voltage UBand the measurement ground, the reference potential is ground IN on terminalKL1 on the right-hand side of the inputs .

Fig. 3.4-1: Connection digital inputs and outputs, inputs and external power supply unit 1potential isolated

OUT1

OUT2

OUT3

OUT4 UB

UB

+1530V

UB

UB

UB

KL2

KL1

IN2

IN1 IN

Digital I/O

24 V DC

external load

IN1 IN2

PSU 1

PSU 2

0V

0V10 ..30V DC


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Logic level:IN1: Trigger: Quiescent level = High, active Flanke = High–Low- edge

Break Dosing: Quiescent level = Low, activat. = Low–High–Low-Impuls(duration ≥20ms)

IN2: Quiescent level = Low, activat. = Low–High–Low-Impuls (duration ≥20ms)Function: Tare or Start dosing

NoteUnused inputs remain open. If the input circuit is also supplied via UB, then theground of the inputs and the ground of UB must be connected .

Fig. 3.5-2: Connection digital inputs and outputs with one external power supply unit (i.e.IN1=Trigger)

O O O O

Digital I/O

PSU

IN1 IN2 0V 24VDC

Externalload


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Control outputs:The digital outputs OUT1..4 are potential-isolated towards the AED and aresupplied via the external supply voltage UB. They are designed as H-side-switches. Thus the loads need to be connected against ground. The outputs areshort-circuit proof and can drive ohmic and inductive loads with currents up toapprox. 0.5 A per output.

Logic level: OUT inactive → voltage is low (H-side-switch deactivated)OUT active → voltage is high (H-side-switch activated

The functions of the digital inputs and outputs are different according to themeasuring amplifier.

3.4.1 AED9301basic

The measurement amplifier board AD101B features two inputs (IN1 and IN2)and two outputs (OUT1 and OUT2, do not connect OUT3,4). The functions aredetermined via the commands IMD, LIV (see operating instructions, Part 3):

Input functions:IMD0: Input functions deactivated, status can be read in via the

command POR.IMD1: IN1 = Tare,

IN2 = external trigger for the trigger function (TRC).IMD2: not selectable

Output functions:LIV1 deactivated: Control OUT1 via POR commandLIV2 deactivated: Control OUT1 via POR commandLIV1 activated: Limit value LIV1 controls output OUT1LIV2 activated: Limit value LIV2 controls output OUT2

The outputs OUT3/4 cannot be driven by the AD101B.


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3.4.2 AED9301plus

The measurement amplifier board AD103 features two inputs (IN1 and IN2) and4 outputs (OUT1...4). The functions are determined via the commands IMD,LIV, OMD (see operating instructions, Part 3):

Input functions:IMD0: Input functions deactivated, status can be read in via the

command POR.IMD1: IN1 = external trigger for the trigger function (TRC),

IN2 = Tare,IMD2: IN1 = stop filling, IN2 = start filling (Dosing – function)

Output functions:IMD < 2 (no dosing mode, as AD101B):LIV1 deactivated: Control OUT1 via POR commandLIV2 deactivated: Control OUT2 via PORLIV1 activated: Limit value LIV1 controls output OUT1LIV2 activated: Limit value LIV2 controls output OUT2The outputs OUT3/4 cannot be driven.

IMD = 2 (dosing mode, only for AD103, see manual part 4)OUT1: Coarse flow - controlOUT2: Fine flow - controlOUT3: Ready signal or emptying control (see operating instructions

AD103, Part 4, dosing)OUT4: Tolerance fault or alarm (see operating instructions AD103, Part

4, dosing)


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Ground sleeve

Slide cable throughintermediate supports on thehousing to stop pos., adv.cable union and bolt securely.

Slide ground sleeve betweenstrands and cable shield to stoppos., press shield againstsleeve flange, cut offprotrusions.

Fan outcable shieldradially.

Dep. on req. wire length Lremove ext. cable sheath Strip off wire ends and tin.

Shorten cable shields andstrip off strands.

Slide cable unions withsealing ring and press.rings over the cable ends

3.5 Cable connection AED 9301A via PG unions

As a connection line between the AED 9301A and transducer or Profibus DP,only a connection line with a shield grounded on both sides may be used. Theshield is to be full-surface applied to the PG union. The cable shield is to be full-surface connected to ground (housing). If large ground potential differencesexist between AED9301A and the partner device, an equipotential bondingconductor is to be provided additionally.

Fig. 3.6-1: Cable connection via PG unions


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4 Technical data of the basic device AED9301A

Type AED9301ATransducerMeasured signal inputBridge excitation voltage DCSG transducer(1...4 full bridges, each 350Ω), RB

Transducer connectionTransducer cable length

mV/VV

Ω

m

±3, nominal ±25

>80

6-wire circuit≤100

Profibus DPProtocolBaud rate, max.Subscriber address, can be set by switchInterface cable length Profibus

Mbit/s

m

Profibus-DP Slave, acc. DIN19245-312

3...991200 (for 9,6 / 19,2 / 93,75 kBit/s)

1000 (for 187,5 kBit/s)400 (for 500 kBit/s)200 (for 1,5 Mbit/s)100 (for 12 Mbit/s)

Control inputs (potential-isolated)NumberInput voltage range, LOWInput voltage range, HIGHInput current, typ., High-level = 24 V

VV

mA

20...5

10...3012

Control outputs (potential-isolated)Numbermax. output current per outputShort circuit current, typ., UB = 24 V; RL < 0,1 ΩShort circuit durationOutput current at Low-levelOutput current at High-levelInsulation voltage, typ. (DC)

AA

mAVV

40.50.8

unlimited<2

>15 at Imax

500SupplyOperating voltage (DC)Current consumption (with load cell (RB = 80Ω)plus output currents of control outputs Iout1..4)

VmA

18...30≤250

(Calculation see below)


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Technical Data, Continuation

Type AED9301ATemperature rangeNominal temperature rangeService temperature rangeStorage temperature range

°C°C°C

-10...+40-20...+60-25...+85

In additionDimensions (L x W x H)GewichtDegree of protection DIN40050 (IEC529)

mmg

195 x 100 x 70approx. 925

IP65

Calculation of the total current consumption (for 80Ω bridge)

Current consumption at 18V supply: ≤250mA + IOUT 1...4



IOUT 1...4 = Current of the control outputs

The technical data of the measuring amplifier AD101B or AD103 are included inthe operating manual AD101B, AD103;Part 2.

Within the shielded structure (see Sect. 3), the entire measuring chain includingthe AED is insensitive against HF interference and conducted interference inaccordance with OIMLR76, EN45501 or EN55011B (interference emissions)and EN50082-2.

Modifications reserved. All details describe our products in general form. They are not to be understood asexpress warranty and do not constitute any liability whatsoever.

AED9301A_P1_e_020517 Hottinger Baldwin Messtechnik GmbHPostfach 100151 D-64201 DarmstadtIm Tiefen See 45 D-64293 DarmstadtTel.: +49/6151/803-0 Fax: +49/6151/8039100E-mail: [email protected] · www.hbm.com

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