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Scancon SCH88BEX Technical Manual

Encoder version 2pb
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SCH88BEX
Technical Manual
Encoder Version 2PB
Scancon Encoders
Huginsvej 8
3400 Hillerød Denmark
Tel. +45 48 17 27 02
www.scancon.dk

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Summary of Contents for Scancon SCH88BEX

  • Page 1 SCH88BEX Technical Manual Encoder Version 2PB Scancon Encoders Huginsvej 8 3400 Hillerød Denmark Tel. +45 48 17 27 02 www.scancon.dk...

  • Page 2: Table Of Contents

    Technical Manual – SCH88BEX Table of Contents 1 Introduction ............................ 4 2 Removable End Cap ........................5 3 Installation ............................6 3.1 Mechanical Installation ......................6 3.2 Electrical Installation ....................... 6 3.3 Termination Resistors ......................7 3.4 Device Address ........................7 4 Profibus Communication ........................
  • Page 3 4.3 Data Exchange ........................28 4.3.1 – Class 1 Multiturn ......................28 4.3.2 – Class 2 Multiturn ......................29 4.3.3 – Scancon 2.1 Multiturn ....................29 4.3.4 – Scancon 2.2 Multiturn ....................31 4.3.5 – Scancon 3.0 Multiturn ....................32 4.4 Manufacturer Specific Functions ..................

  • Page 4: Introduction

    Ex-proof Absolute Encoder. The SCH88BEX features a large through-bore hollow shaft that can be easily mounted on shafts of various sizes. It is the only large through-bore Ex-proof Profibus encoder on the market that has ATEX, IECEx, Class I Div.1, and AEx certifications.

  • Page 5: Removable End Cap

    Technical Manual – SCH88BEX 2 Removable End Cap The picture below shows the end cap when removed from the encoder. Profibus Connection Profibus Connection Bus In Bus Out Cable Shoe for Cable Shoe for Connecting Cable Connecting Cable Shield to Case Ground...

  • Page 6: Installation

    Technical Manual – SCH88BEX 3 Installation As the installation of the SCH88BEX may differ from location to location, it is not possible to give exact instructions on all aspects on how to install the encoder. Below are some general recommendations and procedures. The Installation Guide found on Scancons website should also be consulted.

  • Page 7: Termination Resistors

    SCH88BEX is connected as the first or the last device the switch for the termination resistors must be set to the “On” position. If the SCH88BEX is not connected as the first or the last device the switch for the termination resistors must be set to the “Off” position.
  • Page 8 This possibility has not been implemented in the SCH88BEX as this will “lock” the encoder forever to a particular address and prevent it from future changes by the Change Station Address function.

  • Page 9: Profibus Communication

    This functionality conforms to the Profibus Profile. 3. Scancon 2.1 Multiturn. This is a 32-bit multiturn encoder that, besides all functions for the class 2 encoder, also has further functionality. It has the possibility to change the direction of rotation “on the fly”, Teach-In, Limit Switches and more.

  • Page 10: Parameterization

    This telegram can consist of two parts, the mandatory part according to the Profibus specifications (octet 1 to 8) and the user part (octet 9 and up). The length of the parameterization telegram for the SCH88BEX varies depending on which functionality is selected. Rev. 2.0 26 - August -2023 p.
  • Page 11 The table also describes in which functionality the parameter is present. Notice that if class 2 is used all parameters from class 1 must be present and if Scancon 2.1 is used all parameters from class 1 and class 2 must be present ect.

  • Page 12: Octet No. 9 - Operating Parameters 1

    The setting of this bit controls whether the position value is scaled with the parameters measuring units per revolution and total measuring range or for Scancon 2.1 to 3.0 (see below) other paremeters. Note that if the scaling function is disabled, the values of the scaling parameters are ignored regardless of their value.

  • Page 13: Octet No. 10-13 - Measuring Units Per Revolution/Desired Measuring Units

    Bit no. 6 – Activate Octet 26 This setting of this bit controls whether manufacturer specific parameters are activated. This is handled automatically if Scancon 2.1, 2.2 or 3.0 functionality is selected. 4.1.2 Octet no. 10-13 – Measuring Units per Revolution/Desired Measuring Units For Class 2 –...

  • Page 14: Octet No. 14-17 - Total Measuring Range

    0. Therefore, Total Measuring Range must not exceed the physical number of steps over one revolution. For Scancon 2.1, 2.2 or 3.0. The use of this double word (32-bit) depends on what is selected under Desired Measuring Units Select (see: 4.5.1).

  • Page 15: Octet No. 26 - Operating Parameters 2

    Technical Manual – SCH88BEX Additional parameters for Scancon 2.1, 2.2 and 3.0. 4.1.5 Octet no. 26 – Operating Parameters 2 Bit no. 0 and 1 – Desired Measuring Units Select The settings of these bits select the Desired Measurement Units. It is used to select any required number of steps over 1 revolution, over the whole measuring range or over a part of the measuring range.
  • Page 16 Bit no. 4 – Without Status Bits The setting of this bit controls whether the position data input is transmitted with or without status bits. This bit is only accessible with the Scancon 3.0 functionality. See later under 4.3: Data Exchange.

  • Page 17: Octet No. 27-30 - Lower Limit Switch

    Bit no. 7 – Activate Octet 27 – 39 The setting of this bit controls whether octet 27 – 29 are activated. This is handled automatically when Scancon 2.1, 2.2 or 3.0 functionality is selected. 4.1.6 Octet no. 27-30 – Lower Limit Switch This double word (32-bit) is used for setting the value where the lower limit switch status bit is set.

  • Page 18: Octet No. 35-38 - Physical Impulses

    The setting of this bit controls whether the encoder is a multi turn or single turn encoder . This is handled automatically if Scancon 2.1, 2.2 or 3.0 functionality is selected. Bit no. 4 and 5 – Time Base for Velocity The settings of these bits control the Time Base for Velocity.

  • Page 19: Diagnostic Information

    The table also describes in which functionality the parameter will be present. Notice that if class 2 is used all parameters from class 1 will be present and if Scancon 2.0 is used all parameters from class 1 and class 2 will be present.
  • Page 20 For Class 1 the Diagnostic message has a total length of 16 octet. For Class 2 it has a total length of 57 octets. For Scancon 2.1, 2.2 and 3.0 it, default, has a length of 57 octets, unless the parameter Shorter Diagnostic Select is set.

  • Page 21: Octet No. 7 - Header

    Bit 1 = 1 (on) – Supply voltage alarm Bit no. 2 – Current too High This alarm is not supported by the SCH88BEX and will therefore be sent as 0. Bit no. 3 – Commissioning Diagnostics This alarm is not supported by the SCH88BEX and will therefore be sent as 0.

  • Page 22: Octet No. 9 - Operating Status

    Bit 1 = 1 (on) – Class 2 functionality supported Bit no. 2 – Commissioning Diagnostics Commissioning Diagnostics is not supported by the SCH88BEX and will therefore be sent as 0. Bit no. 3 – Scaling Function Status The setting of this bit indicates whether the scaling function is enabled.

  • Page 23: Octet No. 11-14 - Singleturn Resolution

    4.2.8 Octet no. 18-19 – Supported Alarms This word (16-bit) will indicate the alarms that are supported by the SCH88BEX. Only bit 0 – 4 are used. The rest of the bits (bit 5 – 15) will be sent as 0.

  • Page 24: Octet No. 20-21 - Warnings

    Technical Manual – SCH88BEX Bit no. 4 – Memory Error This alarm is not supported by the SCH88BEX and will therefore be sent as 0. 4.2.9 Octet no. 20-21 – Warnings This word (16-bit) will indicate various warnings for the encoder. Only bits 0 – 6 are used. The rest of the bits (bit 7 –...

  • Page 25: Octet No. 22-23 - Supported Warnings

    4.2.10 Octet no. 22-23 – Supported Warnings This word (16-bit) will indicate the warnings that are supported by the SCH88BEX. Only bits 0 – 6 are used. The rest of the bits (bit 7 – 15) will be sent as 0.

  • Page 26: Octet No. 24-25 - Profile Version

    These two bytes will give the version of the Profibus Profile for Encoders that is supported by the SCH88BEX. The first byte (octet 24) gives the major version number and the second byte (octet 25) gives the minor version number. As an example 0x01 – 0x01 will give version 1.1.

  • Page 27: Octet No. 32-35 - Offset Value

    4.2.18 Octet no. 48-57 – Encoder Serial Number The serial number is sent as an ASCII string of 10 bytes. For the SCH88BEX, the serial number is not used and will therefore be send as 10 times * (0x2A).

  • Page 28: Data Exchange

    1. Class 1 Multiturn – 0 output bytes, 4 input bytes. 2. Class 2 Multiturn – 4 output bytes, 4 input bytes. 3. Scancon 2.1 Multiturn – 4 output bytes, 4 input bytes. 4. Scancon 2.2 Multiturn – 4 output bytes, 6 input bytes.

  • Page 29: Class 2 Multiturn

    4.3.3 – Scancon 2.1 Multiturn For a Scancon 2.1 multiturn encoder there will be both output data and input data. The input data will be the process value that consists of 25 bits and a status block that consists of 7 bits. The output data will either be “don’t care”...
  • Page 30 (first byte is MSB) and the value is unsigned. Notice, that for Scancon 2.1, the process value must be contained in 25 bits (less than 33554432). Input Data for Scancon 2.1 Multiturn...

  • Page 31: Scancon 2.2 Multiturn

    (32767) for increasing position values and the most negative value (-32768) for decreasing position values. The position part of the input data and the Preset Sequence are identical to the Scancon 2.1 (see: 4.3.3).

  • Page 32: Scancon 3.0 Multiturn

    (-32768) for decreasing velocity values. The position part of the input data and the Preset Sequence are identical to the to the Scancon 2.2 (see: 4.3.4) with the exception that it gives the possibility to send the input position value without status bits.
  • Page 33 For use with status bits, the position part of the input data and the Preset Sequence are identical to the to Scancon 2.1 (see: 4.3.3). Input Data for Scancon 3.0 Multiturn with Status Bits (Position Part) Function Position Value and Status Bits...

  • Page 34: Manufacturer Specific Functions

    Teach-In procedure. Note if Scancon 3.0 has been set to send out position data without status bits, this functionality is not possible. The encoder cannot be set to commissioning mode when there are no status bits.

  • Page 35: Teach-In

    Technical Manual – SCH88BEX The new counting direction is stored non-volatile in the internal EEPROM. 4.4.2 – Teach-In The Teach-In procedure consists of two steps, Start Teach-In, and End Teach-In. 4.4.2.1 – Start Teach-In The operator moves the system to the position where the Teach-In shall start. and starts the Teach- In procedure in the following way.
  • Page 36 Technical Manual – SCH88BEX Ending the Teach-In Sequence Function Teach-In End Word Word 1 Word 0 Bit no. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 End Teach-In with bit 29 set.

  • Page 37: Mechanical Dimensions

    Technical Manual – SCH88BEX 5 Mechanical Dimensions Removable End Cap Dimensions in mm. (inch) Plastic screw plugs are provided for cable outlet protection during shipping and storage. These plastic plugs must be replaced by an EX d certified cable gland or blind plug prior to use...

  • Page 38: Technical Specifications

    Technical Manual – SCH88BEX 6 Technical Specifications Electrical Specifications Encoder Type: Absolute Multiturn Encoder Code: Binary Profibus DP-V0. Supports the Profibus Profile for Protocol Absolute Encoders Ver. 1.1 Class 1 and Class 2 and manufacturer specific functions. Max. 15 bits (32,678) revolutions.
  • Page 39 Technical Manual – SCH88BEX Mechanical Specifications Housing: Aluminum treated with Chromital TCP. Material: Stainless Steel (AISI 316) as an option Hollow Shaft: Stainless Steel (AISI 316) Aluminum: approx. 1.5kg (3.3 lbs) Weight: Stainless Steel: approx. 3.0kg (6.6 lbs) Bearing Life: >...

  • Page 40: Document Revision History

    Technical Manual – SCH88BEX 7 Document Revision History Rev. Date Section Notes 22. Aug. 2018 ----- Initial version 7. June 2019 Exchanged picture to showing 2 cable shoes 26. August 2023 ----- Major changes due to added functionality Rev. 2.0 26 - August -2023 p.

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