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SMRA - SSI and BiSS

6.2 Single Cycle Data SCD

SCD structure is different according to the resolution of the SMRA model
encoder.

6.2.1 SCD structure

SCD data has variable length according to the resolution of the encoder. It
consists of the following elements: position value (

Position

), 1 error bit nE

(

Error (nE)

), 1 warning bit nW (

Warning (nW)

) and a 6-bit CRC Cyclical

Redundancy Checking (

CRC

12-bit encoder model (SMRA-xx-x-06)

bit

… 8

5 … 0

function

13-bit encoder model (SMRA-xx-x-07)

bit

… 8

5 … 0

function

14-bit encoder model (SMRA-xx-x-08)

bit

… 8

5 … 0

function

Position

It is the process data transmitted by the Slave to the Master. It has a variable
length according to the resolution of the encoder.
The transmission starts with MSB (most significant bit) and ends with LSB (less
significant bit).

NOTE

The number of information per revolution results from:

2 to the power of resolution

number of ring poles

EXAMPLE

SMRA-I7-2-

-...:

resolution = 08;

MRA/130-

number of poles = 64.

Hence: 2

64 = 256

64 = 16,384 information per revolution

MAN SMRA SSI_BiSS E 1.2.odt

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Содержание MRA

Страница 1: ...User s guide SMRA MRA Bearingless absolute encoder Smart encoders actuators ...

Страница 2: ...ion herein is subject to change without notice and should not be construed as a commitment by Lika Electronic s r l Lika Electronic s r l reserves the right to make all modifications at any moments and without forewarning This manual is periodically reviewed and revised As required we suggest checking if a new or updated edition of this document is available at Lika Electronic s r l s website Lika...

Страница 3: ...cifications 15 4 2 M12 8 pin connector 15 4 3 Connection of the shield 16 4 4 Ground connection 16 4 5 Zero setting Preset input 16 4 6 Counting direction input 16 5 SSI interface 18 5 1 SSI Synchronous Serial Interface 18 5 2 MSB left aligned protocol 19 5 3 Recommended transmission rates 20 5 4 Error bit 20 5 5 Helpful information 21 5 6 Recommended SSI circuit 21 6 BiSS C mode interface 22 6 1 ...

Страница 4: ...et 30 Device ID 30 Time out 30 Software version 31 Manufacturer ID 31 6 5 Application notes 31 6 6 Recommended BiSS input circuit 32 7 Diagnostic LED 33 8 Error and fault diagnostics 34 9 Maintenance 35 10 Troubleshooting 36 11 Default parameters list 37 ...

Страница 5: ...Device ID 30 E Error nE 24 M Manufacturer ID 31 P Position 23 Preset 27 Preset setting enable 29 R Register address 25 RW 25 S Save parameters 30 Save parameters and activate Preset 30 Serial number 29 Software version 31 T Time out 30 W Warning nW 24 ...

Страница 6: ...nt to highlight the parts of the text where information of great significance for the user can be found user must pay the greatest attention to them Instructions must be followed strictly in order to guarantee the safety of the user and a correct use of the device Failure to heed a warning or comply with instructions could lead to personal injury and or damage to the unit or other equipment This i...

Страница 7: ...formation through the SSI interface order code SMRA BG and SMRA GG or the BiSS C mode interface order code SMRA I7 It is mandatory to pair the sensor with the MRA type magnetic ring To make it easier to read and understand the text this guide can be divided into three main sections In the first section some general information concerning the safety the mechanical installation and the electrical co...

Страница 8: ...ion 4 Electrical connections connect Zero Setting Preset and Counting direction inputs to 0VDC if not used to set the encoder to zero preset connect Zero setting Preset input to VDC for 100 µs at least then disconnect VDC normally voltage must be at 0VDC zero preset setting must be performed after Counting direction setting we suggest performing the zero preset setting when the encoder is in stop ...

Страница 9: ...hanical installation has to be carried out with stationary mechanical parts do not disassemble the unit do not tool the unit delicate electronic equipment handle with care do not subject the device to knocks or shocks protect the unit against acid solutions or chemicals that may damage it respect the environmental characteristics of the product we suggest installing the unit providing protection m...

Страница 10: ...mber when reaching Lika Electronic for purchasing spare parts or needing assistance For any information on the technical characteristics of the product refer to the technical datasheet Warning devices having order code ending with Sxxx may have mechanical and electrical characteristics different from standard and be supplied with additional documentation for special connections Technical Info MAN ...

Страница 11: ...om jamming Make sure the mechanical installation meets the system s requirements for both the sensor and the ring indicated in this guide 3 1 Overall dimensions Figure 1 3 2 Magnetic ring It is mandatory to pair the sensor with the MRA type magnetic ring The Figure 1 shows how the sensor and the magnetic ring must be installed the arrow indicates the standard counting direction increasing count wh...

Страница 12: ...ated in the Figure Recommended tightening torque 1 1 Nm 3 3 2 Mounting the sensor 1 Fix the sensor 1 using two cylinder head bolts M4 x 25 UNI5931 Recommended tightening torque 2 5 Nm Recommended minimum bend radius of the cable R 42 mm The max allowed gap between the sensor and the magnetic ring is 1 0 2 mm 0 04 0 008 WARNING Please be sure that the mounting tolerances indicated in Figure 3 are a...

Страница 13: ...n of the arrow See also the section 4 6 Counting direction input on page 16 WARNING After having installed the sensor on the magnetic ring a zero preset setting operation is compulsorily required The zero preset setting operation is further required every time either the sensor or the ring are replaced For any information on the zero preset setting operation please refer to the section 4 5 Zero se...

Страница 14: ... 3 3 3 Optional mounting tool To ease the installation of the sensor we suggest using the optional mounting tool The order code is TOOL LKM 2386 for rings Ø 130 mm MAN SMRA SSI_BiSS E 1 2 odt 14 www lika it www lika biz ...

Страница 15: ... Red 2 Clock IN MA Yellow 3 Clock IN MA Blue 4 Data OUT SLO Green 5 Data OUT SLO Orange 6 Zero setting Preset White 7 Counting direction Grey 8 See the order code for power supply voltage level EXAMPLE SMRA GG 1 08 VDC 5VDC 5 SMRA GG 2 08 VDC 10VDC 30VDC 4 1 M8 cable specifications Model LIKA HI FLEX M8 cable Wires 6 x 0 14 mm2 2 x 0 22 mm2 26 24 AWG Shield tinned copper braid External diameter Ø ...

Страница 16: ...ting preset function connect the Zero setting Preset input to VDC for 100 µs at least then disconnect VDC normally voltage must be at 0VDC Zero setting Preset must be set after Counting direction We suggest setting the zero preset when the encoder is in stop If not used connect the Zero setting Preset input to 0VDC NOTE In the BiSS interface the preset can be activated also by using the Save param...

Страница 17: ... the standard direction i e in the opposite direction to the one shown by the arrow in Figure 1 WARNING After having set the new counting direction it is necessary to set the sensor to zero preset MAN SMRA SSI_BiSS E 1 2 odt 17 www lika it www lika biz ...

Страница 18: ...ansmissions are less conductors are required for transmission less electronic components possibility of insulting the circuits galvanically by means of optocouplers high data transmission frequency hardware interface independent from the resolution of the absolute encoder Furthermore the differential transmission increases the noise immunity and decreases the noise emissions It allows multiplexing...

Страница 19: ...compliance with RS 422 standard The output code can be either Binary or Gray see the order code 5 2 MSB left aligned protocol MSB left aligned protocol allows to left align the bits beginning from MSB most significant bit to LSB least significant bit LSB is then sent at the last clock cycle If the number of clock signals is higher than the data bits then unused bits are forced to logic level low 0...

Страница 20: ... m 300 kHz 200 m 200 kHz 400 m 100 kHz The time interval between two Clock sequence transmissions must be at least 16 µs Tp pause time 16 µs 5 4 Error bit The error bit is intended to communicate the normal or fault status of the Slave 1 correct status the sensor is working properly there are no active errors 0 an error is active position calculation error invalid position value the sensing electr...

Страница 21: ... refer to the section 7 Diagnostic LED on page 33 For any information on errors and their solution please refer to the sections 8 Error and fault diagnostics on page 34 and 10 Troubleshooting on page 36 5 5 Helpful information The position information increases when the ring rotates as indicated by the arrow in Figure 1 At installation always execute a zero setting operation of the position 5 6 Re...

Страница 22: ...ording to the EIA standard RS 422 WARNING Never install the encoder in a single Master multi Slave network 6 1 Communication The BiSS C mode protocol uses two types of data transmission protocols Single Cycle Data SCD it is the main data transmission protocol It is used to send process data from the Slave to the Master For any information refer to the section 6 2 Single Cycle Data SCD on page 23 C...

Страница 23: ...r model SMRA xx x 07 bit 20 8 7 6 5 0 function Position Error nE Warning nW CRC 14 bit encoder model SMRA xx x 08 bit 21 8 7 6 5 0 function Position Error nE Warning nW CRC Position It is the process data transmitted by the Slave to the Master It has a variable length according to the resolution of the encoder The transmission starts with MSB most significant bit and ends with LSB less significant...

Страница 24: ...rors and their solution please refer to the sections 8 Error and fault diagnostics on page 34 and 10 Troubleshooting on page 36 Warning nW 1 bit The warning bit nW is intended to communicate the normal status of the Slave or the presence of a fault condition that does not prevent the unit from running 1 correct status the sensor is working properly there are no active warnings 0 a warning is activ...

Страница 25: ...s 6 bit long Polynomial X6 X1 1 binary 1000011 Logic circuit 6 3 Control Data CD Main control data is described in this section Please refer to the official BiSS documents for complete CD structure BiSS C Protocol Description in the BiSS homepage http www biss interface com Register address It allows to enter the address of the register you need either to read or write It is 7 bit long RW RW 01 wh...

Страница 26: ... Data bit structure bit 7 0 MSB LSB CRC Correct transmission control inverted output Cyclical Redundancy Checking is an error checking which is the result of a Redundancy Checking calculation performed on the message contents This is intended to check whether the transmission has been performed properly It is 4 bit long Polynomial X4 X1 1 binary 10011 Logic circuit MAN SMRA SSI_BiSS E 1 2 odt 26 w...

Страница 27: ...red the desired preset value you must set the value 00 next to the Preset setting enable register and then save data These registers allow the operator to set the Preset value Preset function is meant to assign a certain value to a desired physical position of the encoder The chosen physical position i e the transmitted position value will get the value set next to these registers and all the prev...

Страница 28: ...ng Preset register structure Register 12 13 LSB MSB 27 20 215 28 NOTE The Preset value must be expressed in a 16 bit format thus the Preset value you want to set must be adjusted by multiplying it by the factor 216 nbit where nbit is the number of bits relating to the resolution of the encoder See the following example PRESET SETTING EXAMPLE In a 14 bit resolution encoder 214 16 384 information yo...

Страница 29: ... Save parameters and activate Preset function in the Command register 77 02 Preset setting enable 40 wo It allows the operator to enable the setting of the Preset registers You are allowed to set a new preset value only after having entered the value 01 next to this Preset setting enable register As soon as you have entered the desired preset value you must set the value 00 next to this Preset set...

Страница 30: ...fore activating a new function Device ID 78 7B ro These registers contain the Device ID Identification name is expressed in hexadecimal ASCII code Register 78 79 7A 7B Hex 53 4D 52 41 ASCII S M R A Time out 7C rw It allows to set the minimum interval time between two transmission sequences After having set the desired time out value save data using the Save parameters function Command register 01 ...

Страница 31: ...x then the software version is 1 Manufacturer ID 7E 7F ro These registers contain the Manufacturer ID Identification name is expressed in hexadecimal ASCII code Register 7E 7F Hex 4C 69 ASCII L i Li Lika Electronic 6 5 Application notes Data transmission Parameter Value Clock Frequency min 200KHz max 10MHz BiSS time out It can be set up see the Time out register MAN SMRA SSI_BiSS E 1 2 odt 31 www ...

Страница 32: ...SMRA SSI and BiSS 6 6 Recommended BiSS input circuit MAN SMRA SSI_BiSS E 1 2 odt 32 www lika it www lika biz ...

Страница 33: ... there are no active errors ON lit red Position calculation error invalid position value the sensing electronics is not able to read the ring this problem may be caused for instance by an excessive distance between the sensor and the ring by a wrong reversed assembly of the elements by a damage to the magnetic surface of the ring see the section 3 3 2 Mounting the sensor on page 12 The power suppl...

Страница 34: ...on Error nE on page 24 as previously stated the ring is not read correctly it may be due to one of the following reasons the ring and or the sensor are not mounted properly see the section 3 Mounting instructions on page 11 the ring magnetic surface is damaged somewhere the sensor is not working properly furthermore the alarm may be caused by a position calculation error so that the resulting posi...

Страница 35: ... care as any delicate electronic equipment From time to time we recommend the following operations periodically check the soundness of the structure and make sure that there are no loose screws tighten them if necessary check the gap between the sensor and the magnetic ring Wear of the machine may increase the tolerances the surface of the magnetic ring has to be regularly cleaned using a soft and...

Страница 36: ...ng The sensor has been damaged by short circuit or wrong connection reverse polarity protection is provided for the version SMRA xx 2 only Fault The measured values are either inaccurate or not provided in the whole circumference of the ring Possible cause The sensor is not installed properly on the ring See the section 3 Mounting instructions on page 11 The connection cable runs near high voltage...

Страница 37: ...ult parameters list BiSS C mode interface Parameters list Default value Preset 00 00 Preset setting enable 00 Time out 02 All values are expressed in hexadecimal notation MAN SMRA SSI_BiSS E 1 2 odt 37 www lika it www lika biz ...

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Страница 40: ...tion 8 Error and fault diagnostics added general review 2 1 2 Error bit and LED operation meaning update new optional mounting tool Dispose separately Lika Electronic Via S Lorenzo 25 36010 Carrè VI Italy Tel 39 0445 806600 Fax 39 0445 806699 Italy eMail info lika it www lika it World eMail info lika biz www lika biz ...

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