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750-634 [Incremental Encoder Interface]    

  11 

  

Functional 

Description  

WAGO-I/O-SYSTEM 750 
I/O Modules 

2.1.1.6 Functional 

Description 

Typically, incremental encoders supply two output signals for the encoder 
track, both 90° offset. These signals are designated A and B. 

Usually, incremental encoders have an index track in addition to the two track 
signals. This index track only produces one pulse per one full encoder 
revolution. This pulse and the counter reading can be used to determine the 
absolute encoder position during rotation. The index pulse has a duration of a 
track position pulse. We recommend to always perform the latch process in 
the same rotational direction. 

2.1.1.7 Process 

Image 

Using the I/O module 750-634, a 5 byte input and output process image can be 
transferred to the fieldbus coupler / controller via one logical channel. The 
data sent and received is stored in 2 output bytes (D0, D1) and 5 input bytes 
(D0, D1, D2, D3, D4). The output bytes D2 ... D4 are reserved and without 
function. One control byte (C) and one status byte (S) are used to control the 
data flow. 

 

Attention 

The representation of the process data of some I/O modules or their 
variations in the process image depends on the fieldbus coupler/-controller 
used. Please take this information as well as the particular design of the 
respective control/status bytes from the section "Fieldbus Specific Design of 
the Process Data" included in the description concerning the process image 
of the corresponding coupler/controller. 

 

Input Data 

Output Data 

Status byte  

Control byte  

D0 

Counter value byte 0 (LSB) 

D0 

Counter set value byte 0 (LSB) 

D1 

Counter value byte 1 (MSB) 

D1 

Counter set value byte 1 
(MSB) 

D2 

Signal A, B and C / 
Cycle duration byte 2 (MSB) 

D2 reserved 

D3 

Latch value byte 0 (LSB) / 
Cycle duration byte 0 (LSB)  

D3 reserved 

D4 

Latch value byte 1 (MSB) / 
Cycle duration byte 1 

D4 reserved 

 

Summary of Contents for 750-634

Page 1: ...Fieldbus Independent I O Modules Incremental Encoder Interface 750 634 Manual Version 1 0 3...

Page 2: ...571 8 87 5 55 Fax 49 0 571 8 87 85 55 E Mail support wago com Every conceivable measure has been taken to ensure the correctness and com pleteness of this documentation However as errors can never be...

Page 3: ...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 1 750 634 Incremental Encoder Interface 7 2 1 1 1 View 7 2 1 1 2 Descr...

Page 4: ...ufacturers 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...

Page 5: ...ation 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...

Page 6: ...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 as...

Page 7: ...Description The I O module is an interface for the direct connection of any 24 V incremental encoders A 16 bit counter with quadrature decoder and a 16 bit latch for the zero pulse can be read set or...

Page 8: ...erived from adjacent I O modules or from a supply module The supply voltage for the field side is made automatically through the individual I O modules by means of power jumper contacts Attention This...

Page 9: ...valent to U 5 V on is equivalent to U 15 V B green Quadrature Input off is equivalent to U 5 V on is equivalent to U 15 V 13 14 C D B A C B A Fig 2 1 1 2 Display Elements g063402x C green Zero referen...

Page 10: ...m supply Bit width 2 x 16 bits data 1 x 8 bits Control Status 1 x 8 bits reserved Dimensions mm W x H x L 12 x 64 x 100 from upper edge of DIN 35 rail Weight ca 60 g Standards and Regulations cf Chapt...

Page 11: ...logical channel The data sent and received is stored in 2 output bytes D0 D1 and 5 input bytes D0 D1 D2 D3 D4 The output bytes D2 D4 are reserved and without function One control byte C and one statu...

Page 12: ...ER FLOW In the event of an overflow 65535 to 0 of the 16 Bit counter this bit will be set A reset will take place if the counter exceeds one third of the measuring range 21845 to 21846 or as soon as a...

Page 13: ...750 634 Incremental Encoder Interface 13 Process Image WAGO I O SYSTEM 750 I O Modules...

Page 14: ...WAGO Kontakttechnik GmbH Co KG Postfach 2880 D 32385 Minden Hansastra e 27 D 32423 Minden Phone 05 71 8 87 0 Fax 05 71 8 87 1 69 E Mail info wago com Internet http www wago com...

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