Basics of Absolute Encoders with Interbus (EN)

email: sales@impulseautomation.co.uk web: www.impulseautomation.co.uk Information shown in these data sheets are for guidance purposes only, no liability is accepted for any errors or omissions. The designer or user is solely responsible for the safe and proper use of these parts, assemblies or equipment described. GENERAL INFORMATION TRANSFER SEQUENCE WHAT ARE THE BENEFITS OF INTERBUS COMPARED WITH A CONVENTIONAL SYSTEM WIRING?

Basics of Absolute Encoders ACURO INTERBUS INTERBUS is a real-time bus for the sensor- It is characterized by a circular trans- actor-level which is able to transfer data mission with a fixed message frame and with a small overhead in a range of up to a central master (e.g. SPC switching-in 4 bytes per subscriber for a maximum of 256 assembly). subscribers. A summary message frame; only one message frame for all subscribers • Lower costs for cables and wiring • Data of all subscribers are stored at the same time and transferred sub-sequently • Lower noise sensitivity • Reaction time can easily be determined.

• Many control signals which were analog It only depends on the system’s total before are now available as digital extension; this is important for controlling signals and directly transferable by tasks INTERBUS • Constant sampling rate for reference • Simple layout, installation and starting inputs and actual values; both are trans- procedure ferred in one bus cycle • High efficiency (net data rate): • Considerations of priority are unnecessary the percental share of the message since all subscribers have the same header and of the terminating sequence priority decreases with a growing number of subscribers Doc No: EP0006 Rev:

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Information shown in these data sheets are for guidance purposes only, no liability is accepted for any errors or omissions. The designer or user is solely responsible for the safe and proper use of these parts, assemblies or equipment described. ENCOM USER GROUP Basics of Absolute Encoders ACURO INTERBUS • No system-parameter definition before Encoder manufacturers are joined together starting procedure in the ENCOM user group; drive manu- facturers in DRIVECOM. • Data integrity is secured by 16-bit-CRC (according to CCITT polynomial) done for The user groups shall maximize the benefit each transmission for the customer by standardization of data transmission.

• Sophisticated diagnostic software for the central bus controller: a point of error There is a high availability of devices with can specifically be isolated; in each case INTERBUS interface, and the bus mode has of malfunction there is a possibility to already been successful in industrial use. close the circular system in every single bus clip. Devices with an INTERBUS interface for process control are now available from more than 200 manufacturers. The following device classes defined by ENCOM are used for absolute shaft encoders: Class 2 (K2): • 32-bit process data • Binary • Right-justified • Readable only • No control bits or status bits Class 3 (K3):

• 32-bit process data • Coded according to manufacturer specifications • Right-justified • 7 status bits and control bits Doc No: EP0006 Rev: 001 Impulse Automation Limited United Kingdom Company Registration 665193 Page 2015-03-10 2

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Information shown in these data sheets are for guidance purposes only, no liability is accepted for any errors or omissions. The designer or user is solely responsible for the safe and proper use of these parts, assemblies or equipment described. TECHNICAL DATA Basics of Absolute Encoders ACURO INTERBUS INTERBUS is physically divided into: Remote bus Installation remote bus • Voltage difference transmission RS 485 • For modules with enclosure class IP65 • Max. cable length between two bus clips: (e.g. HENGSTLER absolute shaft encoders) 400 m • Voltage difference transmission RS 485 • Max. overall cable length of remote bus: • Max. overall cable length:

50 m 13 km • Connection via bus clip or passive • A maximum of 64 bus clips/modules may T-manifold be directly connected to the remote bus • Each subscriber has an electrically isolated voltage transformer Peripheral bus • 24 V supply may be led via the bus line or • 5 V voltage interface be connected to the T-manifold • Max. overall cable length of peripheral • 8 modules may be connected. bus: 10 m • A maximum of 8 modules may be connected The transmission speed is 500 kBit/s. Doc No: EP00006 Rev: 001 Impulse Automation Limited United Kingdom Company Registration 665193 Page 2015-03-10 3

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Information shown in these data sheets are for guidance purposes only, no liability is accepted for any errors or omissions. The designer or user is solely responsible for the safe and proper use of these parts, assemblies or equipment described. INTERBUS DIAGNOSTIC CONCEPT Basics of Absolute Encoders ACURO INTERBUS Switching-in assembly Display: Mode of operation Switching-in assembly ready CLAB signal of SPC active INTERBUS running Bus segments off Display:

Error type Error on switching-in assembly Defective remote bus Defective peripheral bus Error on module Parameter for error type The diagnostic system is able to indicate • Self-acting fault detection and display peripheral and controller errors beside the with point and type of error without user selection of faults. Due to a row of LEDs programming comprising 16 bits, available on most swit- ching-in assemblies, decentralized process • Usual diagnosis by hand programming states can be displayed centrally. unit can be kept • Status display on control system for • Diagnostic representation is always the inputs and outputs without hand pro- same regardless of the control system.

gramming unit Doc No: EP0006 Rev: 001 Impulse Automation Limited United Kingdom Company Registration 665193 Page 2015-03-10 4

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