WAGO Digital impulse interface User manual

Brand: WAGO

Model: Digital impulse interface

Type: User manual

Fieldbus Independent

I/O Modules

Digital Impulse Interface

750-635

Manual

Version 1.1.3

ii • General

WAGO-I/O-SYSTEM 750

I/O Modules

WAGO Kontakttechnik GmbH & Co. KG

Hansastraße 27

D-32423 Minden

Phone: +49 (0) 571/8 87 – 0

Fax: +49 (0) 571/8 87 – 1 69

E-Mail: [email protected]

Web: http://www.wago.com

Technical Support

Phone: +49 (0) 571/8 87 – 5 55

Fax: +49 (0) 571/8 87 – 85 55

E-Mail: [email protected]

Every conceivable measure has been taken to ensure the correctness and com-

pleteness of this documentation. However, as errors can never be fully ex-

cluded, we would appreciate any information or ideas at any time.

E-Mail: [email protected]

We wish to point out that the software and hardware terms as well as the tra-

demarks of companies used and/or mentioned in the present manual are gene-

rally trademark or patent protected.

Content • iii

WAGO-I/O-SYSTEM 750

I/O Modules

CONTENT

1 Important Comments ................................................................................. 4

1.1 Legal Principles........................................................................................4

1.1.1 Copyright............................................................................................. 4

1.1.2 Personnel Qualification .......................................................................4

1.1.3 Intended Use........................................................................................ 4

1.2 Symbols....................................................................................................5

1.3 Number Notation......................................................................................5

1.4 Safety Notes .............................................................................................6

1.5 Scope ........................................................................................................6

2 I/O Modules ................................................................................................. 7

2.1 Special Modules .......................................................................................7

2.1.1 750-635 [Digital Impulse Interface]....................................................7

2.1.1.1 View................................................................................................7

2.1.1.2 Description......................................................................................7

2.1.1.3 Schematic Diagram.........................................................................8

2.1.1.4 Display Elements ............................................................................8

2.1.1.5 Technical Data ................................................................................9

2.1.1.6 Functional Description..................................................................10

2.1.1.7 Process Image ...............................................................................11

2.1.1.8 Application / Start-up.................................................................... 13

4 • Important Comments

Legal Principles

WAGO-I/O-SYSTEM 750

I/O Modules

1 Important Comments

To ensure fast installation and start-up of the units described in this manual,

we strongly recommend that the following information and explanations are

carefully read and abided by.

1.1 Legal Principles

1.1.1 Copyright

This manual is copyrighted, together with all figures and illustrations con-

tained therein. Any use of this manual which infringes the copyright provi-

sions stipulated herein, is not permitted. Reproduction, translation and elec-

tronic and photo-technical archiving and amendments require the written con-

sent of WAGO Kontakttechnik GmbH & Co. KG. Non-observance will entail

the right of claims for damages.

WAGO Kontakttechnik GmbH & Co. KG reserves the right to perform modi-

fications allowed by technical progress. In case of grant of a patent or legal

protection of utility patents all rights are reserved by WAGO Kontakttechnik

GmbH & Co. KG. Products of other manufacturers are always named without

referring to patent rights. The existence of such rights can therefore not be

ruled out.

1.1.2 Personnel Qualification

The use of the product detailed in this manual is exclusively geared to special-

ists having qualifications in PLC programming, electrical specialists or per-

sons instructed by electrical specialists who are also familiar with the valid

standards. WAGO Kontakttechnik GmbH & Co. KG declines all liability re-

sulting from improper action and damage to WAGO products and third party

products due to non-observance of the information contained in this manual.

1.1.3 Intended Use

For each individual application, the components supplied are to work with a

dedicated hardware and software configuration. Modifications are only per-

mitted within the framework of the possibilities documented in the manuals.

All other changes to the hardware and/or software and the non-conforming use

of the components entail the exclusion of liability on part of WAGO Kon-

takttechnik GmbH & Co. KG.

Please direct any requirements pertaining to a modified and/or new hardware

or software configuration directly to WAGO Kontakttechnik GmbH & Co.

KG.

Important Comments • 5

Symbols

WAGO-I/O-SYSTEM 750

I/O Modules

1.2 Symbols

Danger

Always abide by this information to protect persons from injury.

Warning

Always abide by this information to prevent damage to the device.

Attention

Marginal conditions must always be observed to ensure smooth operation.

ESD (Electrostatic Discharge)

Warning of damage to the components by electrostatic discharge. Observe

the precautionary measure for handling components at risk.

Note

Routines or advice for efficient use of the device and software optimization.

More information

References on additional literature, manuals, data sheets and internet pages.

1.3 Number Notation

Number Code Example Note

Decimal 100 normal notation

Hexadecimal 0x64 C notation

Binary '100'

'0110.0100'

within inverted commas,

nibble separated with dots

6 • Important Comments

Safety Notes

WAGO-I/O-SYSTEM 750

I/O Modules

1.4 Safety Notes

Warning

Switch off the system prior to working on bus modules!

In the event of deformed contacts, the module in question is to be replaced, as

its functionality can no longer be ensured on a long-term basis.

The components are not resistant against materials having seeping and insu-

lating properties. Belonging to this group of materials is: e.g. aerosols, sili-

cones, triglycerides (found in some hand creams).

If it cannot be ruled out that these materials appear in the component envi-

ronment, then additional measures are to be taken:

- installation of the components into an appropriate enclosure

- handling of the components only with clean tools and materials.

Attention

Cleaning of soiled contacts may only be done with ethyl alcohol and leather

cloths. Thereby, the ESD information is to be regarded.

Do not use any contact spray. The spray may impair the functioning of the

contact area.

The WAGO-I/O-SYSTEM 750 and its components are an open system. It

must only be assembled in housings, cabinets or in electrical operation

rooms. Access must only be given via a key or tool to authorized qualified

personnel.

The relevant valid and applicable standards and guidelines concerning the

installation of switch boxes are to be observed.

ESD (Electrostatic Discharge)

The modules are equipped with electronic components that may be destroyed

by electrostatic discharge. When handling the modules, ensure that the envi-

ronment (persons, workplace and packing) is well grounded. Avoid touching

conductive components, e.g. gold contacts.

1.5 Scope

This manual describes the Special Module 750-635 Digital Impulse Interface

of the modular WAGO-I/O-SYSTEM 750.

Handling, assembly and start-up are described in the manual of the Fieldbus

Coupler. Therefore this documentation is valid only in the connection with the

appropriate manual.

750-635 [Digital Impulse Interface] • 7

View

WAGO-I/O-SYSTEM 750

I/O Modules

2 I/O Modules

2.1 Special Modules

2.1.1 750-635 [Digital Impulse Interface]

1 Channel Digital Impulse Interface for Magneto-strictive Distance Sensors

2.1.1.1 View

13 14

750-635

Power jumper contacts

Data contacts

24V

Error

Function

Fig. 2.1.1-1: 1 Channel Digital Impulse Interface 750-635 g063500e

2.1.1.2 Description

The digital impulse interface is designed for the connection of magneto-

strictive distance sensor. Fast and fail-safe signal transmission is guaranteed

by the RS422 interface.

Once a start pulse has been received, the magneto-strictive sensor will return

the echo(s) of this pulse to the input module via the RS422 interface. In the

sensor, a pulse extends towards the end of the rod which is energized by the

position marker (magnets) and transformed into a stop signal in the sensor e-

lectronics. The time between the start pulse echo and the stop pulse is measu-

red and made available to the controls in a 24 bit value, whereby the measured

time is proportional to the distance.

At the time of start-up of the interface, the waveguide velocity of the distance

sensor in the control program has to be taken into consideration to be able to

parameterize the digital impulse interface accordingly following a voltage fai-

lure. The controls can perform an adjustment of the zero point and of the num-

ber of position markers.

8 • 750-635 [Digital Impulse Interface]

Schematic Diagram

WAGO-I/O-SYSTEM 750

I/O Modules

Attention

This module has no power contacts for ground (earth). For field supply with

ground (earth) to downstream I/O modules, a supply module will be needed.

The module can be used with all couplers/controllers of the

WAGO-I/O-SYSTEM 750 (except for the economy types 750-320, -323, -324

and -327).

2.1.1.3 Schematic Diagram

24V

Function

24V

Logic

Error

2 x 10nF

1 x 10nF

2 x 270pF

750-635

Fig. 2.1.1-2: 1 Channel Digital Impulse Interface 750-635 g063501e

2.1.1.4 Display Elements

LED Designa-

tion

Status Function

off Module is not taking part in data exchange

green

Function

on Module is taking part in data exchange

off Faultless operation

13 14

Fig. 2.1.1-3: Dis-

play Elements

g063802x

red

Error

Line break

No acknowledgement from sensor,

waveguide velocity is not set

750-635 [Digital Impulse Interface] • 9

Technical Data

WAGO-I/O-SYSTEM 750

I/O Modules

2.1.1.5 Technical Data

Module Specific Data

Sensor connection Start/Stop; Init; Uv; Ground

Connection of the shield via the housing of the

sensor

Number of inputs 1

Current consumption (internal) 45 mA

Voltage via power jumper contacts DC 24 V (-15 % ... + 20 %)

Data transmission RS 422

Signal output Differential signal RS 422

Signal input Differential signal RS 422

Internal bit width 1 x 24 bits Data In/Out

1 x 8 bits Control/Status In/Out

Resolution 1 µm

Hysteresis, Precision depends on the distance sensor

Update time 2 ms

Distance sensor length ≤ 4 m

Maximum line length

500 m

Isolation 500 V (System/Supply)

Dimensions (mm) W x H x L 12 x 64* x 100

* from upper edge of 35 DIN rail

Weight ca. 55 g

Standards and Regulations (cf. Chapter 2.2 of the Coupler/Controller Manual)

EMC-Immunity to interference (CE) acc. to EN 50082-2 (96)

EMC-Emission of interference (CE) acc. to EN 50081-1 (93)

Approvals (cf. Chapter 2.2 of the Coupler/Controller Manual)

(UL508)

(UL1604) Class I Div2 ABCD T4A

DEMKO II 3 GD EEx nA II T4

Conformity Marking

More Information

Detailed references to the approvals are listed in the document "Overview

Approvals WAGO-I/O-SYSTEM 750", which you can find on the CD ROM

ELECTRONICC Tools and Docs (Item-No.: 0888-0412)

or in the internet under:

www.wago.com ! Documentation ! WAGO-I/O-SYSTEM 750 ! Sys-

tem Description

10 • 750-635 [Digital Impulse Interface]

Functional Description

WAGO-I/O-SYSTEM 750

I/O Modules

Further general technical data for the WAGO-I/O-SYSTEM 750 is available

in the manuals of the specific fieldbus coupler / controller.

2.1.1.6 Functional Description

2.1.1.6.1 Block Diagram of the P-Interface

INIT

START/STOP

750-635 BTL

RS422

Fig. 1: 2.4 Block diagram of the P-Interface

2.1.1.6.2 Block Diagram of the I/O Module

The following block-diagram should clarify the internal function of the I/O

module. Cyclical start-impulses are initiated by the ASIC and, depending on

the number of positioners, the stop-impulses from the sensor are processed.

The sensor-specific velocity of the waveguide is taken into consideration. It is

the task of the µController to trigger the measuring cycle and to poll the meas-

uring data from the multiplexer. The following digital filter decreases the noi-

se and a zero unit enables measuring of relative position values if necessary.

Data-exchange with the PLC is handled via the RAM which contains 3 byte of

data and 1 byte for status and control.

Fig. 2: Block Diagram

750-635 [Digital Impulse Interface] • 11

Process Image

WAGO-I/O-SYSTEM 750

I/O Modules

2.1.1.6.3 Sensor Connection

Input Function

I+ 1 Init-Signal RS422, positive

I- 5 Init-Signal RS422, negative

S+ 4 Start/Stop-Signal RS422, positive

S- 8 Start/Stop-Signal RS422, negative

+24V 2,6 24 V supply voltage for the distance sensor

0V 3,7 Frame potential for the distance sensor

As an alternative to the represented sensor connection, the shielded part of the

cable can be fixed by WAGO’s 790 series shield (screen) clamping saddles.

2.1.1.6.4 Voltage Supply

The bus module gets a voltage supply of 24V (-15% / +20%) via the power

jumper contacts. The distance sensor can be directly supplied with the 24V

voltage of the module. It should be taken into account whether the voltage

supply is restricted by other technical data.

Note

As the precision of the distance sensors depends in certain limits on the sta-

bility of the voltage supply a regulated high-capacity power supply unit

should be used to supply the bus node and the field side or a separation of the

voltage supply between actuators and sensors should be provided.

2.1.1.7 Process Image

This I/O module is represented with 4 bytes in the input process image and al-

so with 4 bytes in the output process image. The transfer of the data to be

transmitted and the received data is made via 3 output and 3 input bytes (D0 ...

D2). 1 Control byte (C) and 1 Status byte (S) are used to control the floating

data.

Input data Output data

S Status byte C Control byte

D0 Process data Byte 0 (LSB) D0 Set value Byte 0 (LSB)

D1 Process data Byte 1 D1 Set value Byte 1

D2 Process data Byte 2 (MSB) D2 Set value Byte 2 (MSB)

12 • 750-635 [Digital Impulse Interface]

Process Image

WAGO-I/O-SYSTEM 750

I/O Modules

2.1.1.7.1 Control Byte

Control byte C

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 0 Sensor

Sensor

To set the

zero

point

To set

wave-

guide

velocity

To set the

number

of sen-

sors

Error

Reset

Error Reset In case of 1-signal the stop-underflow/ and –overflow bit and the error bit are

reset (not edge-triggered)

To set the

number of

sensors

In the case of a rising edge the number of sensors set in Bit 4 and 5 are taken

over.

0 reserved

Setting and Selection of Positioners

Because the I/O module allows up to 4 positioners at the sensor, in case of

more than one positioner is being used, it is necessary to:

• set the no. of positioners during initialization of the I/O module

• select a positioner for the measuring cycle

Setting the No. of Positioners (Initialization)

The setting of no. of positioners installed at the sensor has to be processed by

the PLC during initialization via bits 4 and 5 of the control-byte (see table 3

and 4). The adjusted no. of positioners will be stored in the RAM if bit 1 is set

to high.

Selection of a Positioner (Measuring Cycle)

During operation up to 4 different values from the positioners could be calcu-

lated in series. To request a specific positioner, bits 4 and 5 from the control-

byte have to be set.

Triggering of the position transmitters:

Bit 5

Bit 4

Position transmitter

0 0 1

0 1 2

1 0 3

1 1 4

Attention

Bit 1 of the control-byte has to be kept to „0“during normal operation.

750-635 [Digital Impulse Interface] • 13

Application / Start-up

WAGO-I/O-SYSTEM 750

I/O Modules

2.1.1.7.2 Status Byte

Status Byte S

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Error Sensor

Sensor

ACK

(setting

zero

adjust-

ment)

ACK

(setting

wave-

guide

velocity)

- top un-

der-flow

(not

enough

stop

impulses)

Error 0 = faultless operation

1 = group signal error e.g.:

- waveguide velocity not set

- less no. of stop impulses

- maximum waveguide velocity exceeded

- timeout: there are no measured values, measured values not valid

- error occurred when setting waveguide velocity or zero point

- selection of sensor not valid; the selected address is invalid because of

the missing initialization

0 reserved

2.1.1.8 Application / Start-up

2.1.1.8.1 Setting the Waveguide Speed

Each application of this bus module requires a specific setting, knowing that

each distance sensor operates at a different waveguide velocity of the sensor.

This velocity is set by means of the process data communication with the con-

trol byte and the bus module input bytes. The waveguide velocity can be set as

a decimal value in the range of 0.00 to 3000.00 m/s, the resolution amounting

to 0.01 m/s. This setting is stored in the module operating memory as a non

power failure safe value, and must, therefore, be reloaded into the module by

the controls following each voltage failure (by switching off the bus coupler or

disconnecting modules). The default velocity setting is 0.00 m/s. This status is

signaled by the module’s error LED as well as by bit 6 of the status byte.

The velocity is activated by setting the output bytes to the sensor specific va-

lue, followed by the setting of control bit 2. The feedback of a successful

speed setting is ensured by the set bit 2 of the status byte.

14 • 750-635 [Digital Impulse Interface]

Application / Start-up

WAGO-I/O-SYSTEM 750

I/O Modules

Note

Following a supply voltage failure at the bus coupler, ensure by a correspond-

ing initialization of the bus module that the waveguide velocity setting is re-

instated. The red error LED and a “High” signal of status bit 6 signal the

status “waveguide velocity not set”.

2.1.1.8.2 Zero Point Setting

A zero point setting is also possible by means of the process data communica-

tion. The absolute measured value of the distance sensor is adopted into the

zero point register by the rising edge of bit 3 of the control byte. The zero

point setting is stored in the operating memory of the module as a non power

failure safe value. The feedback of a successful speed setting is ensured by the

set bit 3 of the status byte.

Note

As an alternative to the internal zero point storage, the relative measured va-

lue calculation can also be made by a POU in the controls. We strongly rec-

ommend the latter way if a bus coupler initialization is not guaranteed fol-

lowing a supply voltage failure, or if a reference to the zero point setting is

not possible. Please also refer to chapter 2.1.1.8.4.

2.1.1.8.3 Error Acknowledgement

Errors are signaled with the set bit 6 of the status byte and displayed by the er-

ror LED.

An error is acknowledged automatically following the remedy of the error or

by setting bit 0 in the status byte.

750-635 [Digital Impulse Interface] • 15

Application / Start-up

WAGO-I/O-SYSTEM 750

I/O Modules

2.1.1.8.4 How to perform a module initialization

Power

Power On values:

Zero pos. = 0.0;USG=0.0

No. of position markers = 1

Statusbit 6 (Error)= 1

Error LED= On

No.

Of positioners

=>1 ?

velocity setting

Terminal

intialization

via PLC

Set no. of

position markers

Reference drive

for position markers 1-4

set zero position

Calculation of

rel. zero in the

terminal ?

Statusbit 6 (Error)

„high“ ?

Acknowledge

with Controlbit 0

Measurement is active

Yes

2.1.1.8.5 Examples

2.1.1.8.5.1 Example for the parameterization of a distance sensor with

start/stop interface and 1 position transmitter

Status byte Control byte Output values Input values Remark

hex dec hex dec hex (D2 D1 D0) dec hex (D2 D1 D0) dec

0x40 64 0x00 0 don’t care don’t care 0x00 00 00 0 Switching on coupler/internal

bus

Error: speed is not set

0x04 4 0x04 4 0x04 51 78 283000 Process data 1 Process

data 1

Setting waveguide velocity

(corresponds to 2,830.00 m/s)

0x00 0 0x00 0 don’t care don’t care Process data 1 Process

data 1

Position transmitter 1

16 • 750-635 [Digital Impulse Interface]

Application / Start-up

WAGO-I/O-SYSTEM 750

I/O Modules

2.1.1.8.5.2 Example for the parameterization of a distance sensor with

start/stop interface and 2 position transmitters

Status byte Control byte Output values Input values Remark

hex dec hex dec hex (D2 D1 D0) dec hex (D2 D1 D0) dec

0x40 64 0x00 0 don’t care don’t care 0x00 00 00 0 Switching on coupler/internal

bus

Error: speed is not set

0x04 4 0x04 4 0x04 51 78 283000 Process data 1 Process

data 1

Setting waveguide velocity

(corresponds to 2,830.00 m/s)

0x00 0 0x12 18 don’t care don’t care Process data 1 Process

data 1

Setting the number of sensors

(2 sensors)

0x00 0 0x00 0 don’t care don’t care Process data 1 Process

data 1

Selecting sensor 1 - position

transmitter 1 in process data

0x10 16 0x10 16 don’t care don’t care Process data 2 Process

data 2

Selecting sensor 2 - position

transmitter 2 in process data

750-635 [Digital Impulse Interface] • 17

Application / Start-up

WAGO-I/O-SYSTEM 750

I/O Modules

WAGO Kontakttechnik GmbH & Co. KG

Postfach 2880 • D-32385 Minden

Hansastraße 27 • D-32423 Minden

Phone: 05 71/8 87 – 0

Fax: 05 71/8 87 – 1 69

E-Mail: [email protected]

Internet: http://www.wago.com

WAGO Digital impulse interface User manual

WAGO Digital impulse interface User manual

WAGO Digital impulse interface User manual

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