ELAP MEM620-Bus User manual

MEM-BUS ABSOLUTE ENCODER

Instruction Manual

MEM-BUS EtherNet/IP™ENCODER Instruction Manual

ENIP_Manual_ENG 17/07/2018 2

References

THE CIP NETWORKS LIBRARY

Volume 1 –Common Industrial Protocol (CIP™), Edition 3.23

Volume 2 –EtherNet/IP Adaptation of CIP, Edition 1.23

For more information regarding ODVA, visit www.odva.org.

Registered Trademarks

RSLinx™ and RSLogix5000™ are registered trademarks of Rockwell Automation.

EtherNet/IP™and CIP™ are registered trademarks of ODVA®.

All other specified products, names and logos, serve exclusively for information purposes and may be

trademarks of their respective owners, without any special marking to indicate this.

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Summary

1 EtherNet/IP™...........................................................4

1.1 General information ...........................................4

1.2 CIP™ Protocol .....................................................4

1.3 The “Producer / Consumer” Model....................6

1.4 RPI Parameter.....................................................6

1.5 EtherNet/IP™ topologies ....................................6

1.6 CIP™ Object Model .............................................7

1.7 EDS File ...............................................................8

2 Installation...............................................................9

2.1 Safety .................................................................9

2.2 Transport and storage .......................................9

2.3 Mechanical assembly.........................................9

2.4 Electrical supply.................................................9

2.5 IP Address H/W Setting ...................................10

2.6 IP Address S/W Setting ....................................11

2.7 Preset button...................................................12

2.8 LED Indicators ..................................................12

3 CIP Objects ............................................................13

3.1 Identity Object –01H.......................................14

3.2 Position Sensor Object –23H ..........................15

3.3 Assembly Object –04H....................................20

3.4 TCP/IP Interface Object –F5H......................... 23

3.5 Ethernet Link Object –F6H ............................. 26

4 Configuring the encoder using RSLogix5000 ........ 29

4.1 General tab...................................................... 30

4.2 Connection tab................................................. 32

4.3 Module Info tab ............................................... 33

4.4 Internet Protocol, Port Configuration and

Network tabs ........................................................ 33

4.5 Configuration ................................................... 34

4.6 Preset function................................................. 35

TECHNICAL SPECIFICATIONS..................................... 38

ORDERING INFORMATION........................................ 39

Enclosures: dimensional drawings

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1 EtherNet/IP™

1.1 General information

EtherNet/IP™(Ethernet Industrial Protocol) is a frame-based computer networking technology for local

industrial area networks.

It follows the seven layers of the OSI (Open System Interconnection) model:

Layer

Function

7. Application

It supplies network services to end-user application.

6. Presentation

It handles syntax processing of message data such as format conversions and

encryption / decryption needed to support the application layer above it.

5. Session

It manages the sequence and flow of events that initiate and tear down

network connections. It is built to support multiple types of connections that

can be created dynamically and run over individual networks.

4. Transport

It delivers data across network connections. Different transport protocols

may support a range of optional capabilities including error recovery, flow

control, and support for re-transmission.

3. Network

Logical addressing is translated here into physical addressing.

2. Data Link

It checks for physical transmission errors and packages bits into data

"frames".

1. Physical

It is responsible for ultimate transmission of digital data bits from the

Physical layer of the sending (source) device over network communications

media to the Physical layer of the receiving (destination) device.

Table 1.1 –OSI model layers

1.2 CIP™ Protocol

As an application layer (number 7 in the OSI model), EtherNet/IP uses the Common Industrial Protocol

(CIP™) for process control. ELAP MEM-BUS encoder meets all the requirements of the EtherNet/IP protocol

according to IEC61784-1 and those of the encoder profile.

The encoder is an I/O adapter in the EtherNet/IP. It receives and sends explicit and implicit messages either

cyclic or on request (polled).

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EtherNetIP uses TCP/IP (Transmission Control Protocol) and UDP/IP (User Datagram Protocol) for

communication.

Implicit messaging is used for real-time communication between a programmable logic controller (PLC) and

the encoder in EtherNet/IP. With implicit messaging a connection is established between exactly two

devices within the CIP™protocol to transfer, for example, I/O data such as position and velocity from the

encoder to the PLC. Implicit messaging uses UDP/IP via port 2222. As a result, a fast data rate is used.

Explicit messaging is used in EtherNet/IP for communication that does not need to take place in real time; it

is used, for example, to transfer parameters from the PLC to the encoder. Explicit messaging uses TCP/IP.

Devices that originate or use data on the network have factory-assigned media access control (MAC)

addresses for unique identification. The MAC address (MAC ID) consists of 6 bytes. The first three bytes

identify the manufacturer. The last three bytes are unique to the device.

The MAC address of ELAP MEM-BUS encoders is 60-D7-E3-1x-xx-xx.

EtherNet/IP is based on the standard Ethernet frame, which consists of the Ethernet header, the Ethernet

data, and the Ethernet trailer. The MAC IDs of the receiver (destination address) and of the source (source

address) are contained in the Ethernet header.

The Ethernet data field consists of several nested protocols:

The IP datagram is transported in the user data of the Ethernet data field.

The TCP segment or the UDP datagram is transported in the user data of the IP datagram.

The CIP™protocol is transported in the user data of the TCP segment or the UDP datagram.

CIP™is a message-based protocol that implements a relative path to send a message from the “producing”

device to the “consuming”devices. The producing device contains the path information that steers the

message along the proper route to reach its consumers. Because the producing device holds this

information, the other devices along the path simply pass it, without any need to store it.

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The Producer/Consumer model has two significant benefits:

You do not need to configure routing table in the bridging modules, which greatly simplifies

maintenance and module replacement.

You maintain full control over the route taken by each message, which enables you to select

alternative paths for the same end device.

1.3 The “Producer / Consumer”Model

The CIP Producer/Consumer networking model replaces the old source/destination model (Known as

master/slave). The Producer/Consumer model reduces network traffic and increases speed of transmission.

In traditional I/O systems, controllers poll input modules to obtain their input status. In the CIP system

input modules are not polled any more. Instead, they produce their data either upon a change of state or

periodically. The frequency of update depends upon the options that are chosen during configuration and

the topology of the network. Each input module, therefore, is a producer of input data, while the controller

is a consumer of data.

The controller can also produce data for other controllers to consume. The produced and consumed data is

accessible by multiple controllers and other devices over the EtherNet/IP network. This data exchange

conforms to the Producer/Consumer model.

1.4 RPI Parameter

The requested packet interval (RPI) is the update rate that is specified for a particular piece of data in the

network. This value specifies how often to produce the data for that device. For example, if RPI = 50 ms, it

means that every 50 ms the device sends its data to the controller or the controller sends its data to the

device.

RPIs are only used for devices that exchange data. For example, a ControlLogix® EtherNet/IP bridge in the

same chassis as the controller does not require an RPI because it is not a data-producing member of the

system; it is used only as a bridge to remote modules.

1.5 EtherNet/IP™topologies

ELAP MEM-BUS encoders can be connected in any of three network topologies: star, linear, or Device Level

Ring (DLR).

The linear topology uses the embedded switching capability to form a daisy chain style network that has a

beginning and an end.

Linear topology simplifies installation and reduces wiring and installation costs, but a break in the network

disconnects all devices downstream from the break.

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A DLR network is a single-fault-tolerant ring network that is intended for the interconnection of automation

devices. DLR topology is advantageous as it can tolerate a break in the network. If a break is detected, the

signals are sent out in both directions.

The EtherNet/IP™specification include the Device Level Ring (DLR) protocol, allowing multi-port devices to

be connected in a ring topology. DLR provides for fast network fault detection and recognition in order to

support the most demanding control applications. For example, a ring of 50 nodes implementing the DLR

protocol has a worst case fault recovery time of less than 3 ms.

The DLR protocol operates at layer 2, in the OSI model. The presence of the ring topology and the operation

of the DLR protocol are transparent to higher layers protocols, such as TCP/IP and CIP, with the exception

of a DLR object that provides a DLR configuration and diagnostic interface via CIP.

1.6 CIP™ Object Model

EtherNet/IP uses an object model for network communication wherein all functions and data of a device

are defined. CIP objects are organized in Classes, Instances and Attributes.

Class

It contains related objects of a device, which is organized in instances.

Instance

It consists of different attributes that describe the properties of the instance. Different instances of

a class have the same services, the same behavior, and the same attributes. They can, however,

have different values.

Attributes

They represent the data that a device provides over EtherNet/IP. The attributes include the current

values of a configuration or an input. Typical attributes are configuration and status information.

Services

They are used to access the classes or the attributes of a class or to generate specific events. These

services execute defined actions such as reading/writing the attributes.

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1.7 EDS File

The EDS (Electronic Data Sheet) file, provided by ELAP, contains all information that is related to the

measuring-system-specific parameters and the operating modes of the MEM-BUS EtherNet/IP encoders.

The EDS file is integrated using the EtherNet/IP network configuration tool to configure and place in

operation the MEM-BUS EtherNet/IP encoder.

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2 Installation

The encoder must be installed by qualified experts only, with net voltage off and standstill shaft. The

operating instructions of the machine manufacturer must be always observed.

2.1 Safety

Always observe prevention and safety norms during the installation and operation of the device.

Use the encoder exclusively for its intended purpose.

High voltage, current and rotating parts may cause serious or fatal injuries.

Encoders must not be operated outside the specified limited values (see detailed product

documentation).

2.2 Transport and storage

Always transport or store encoders in their original packaging.

Never drop encoders or expose them to major vibrations.

2.3 Mechanical assembly

Do not open the device.

Do not carry out mechanical changes on the device.

Avoid impacts or shocks on the housing and shaft.

Operate the device within its environmental specifications.

2.4 Electrical supply

Carry out the wiring operations exclusively with unplugged voltage supply

Do not operate on the electrical plant while the encoder is on.

Ensure that the entire plant complies with EMC requirements. The installation environment and

wiring affect the electromagnetic compatibility of the encoder. In particular:

obefore handling and installing the encoder, eliminate any electrostatic charge from your

body and from any tool that will get in contact with the device;

osupply the encoder with steady voltage free from electrical noise; if necessary, install

EMC filters for the supply input;

oalways use shielded and, if possible, twisted cables;

odo not use longer cables than necessary;

othe device cable path should be away from power cables;

oinstall the device away from possible interference sources, or shield it effectively;

oconnect the cable shield and the connector case to a protective earth and make sure that

the protective earth is free from electrical noise; the connection to earth can be carried

out at the encoder side and/or at the user side; it is up to the user to evaluate which is

the best solution to keep the electrical interference as low as possible.

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In order to achieve the highest possible noise immunity, the Ethernet cable screen must be connected to

ground on both ends.

In certain cases current might flow over the screen, therefore it is recommended to use equipotential

connections.

2.5 IP Address H/W Setting

The MEM-BUS encoder is provided with three rotary switches, for hardware setting of the IP address. The

IP address can be assigned using one of the two methods described below:

1. Use of the rotary switches to set the last byte value for the IP address (192.168.1.xxx).

Set the three switches to a valid address, in the range of 001 –254, and take a cycle power to the

encoder. The MEM-BUS encoder will power up with the IP address set to 192.168.1.xxx, where xxx

is given by the position of the three network address switches. In the picture below, it is xxx = 123.

2. Use the BOOTP/DHCP protocol to assign a dynamic IP address.

Set the three rotary switches to 777 (for BOOTP) or 999 (for DHCP) and then take a cycle power to

the encoder. At power up, the MEM-BUS encoder will request an IP address from a BOOTP/DHCP

server, which must be in the same network. This IP address, just assigned, can be statically

allocated by disabling the BOOTP/DHCP mode via software and setting the rotary switches to 000.

At next cycle power, no further request is sent to the BOOTP/DHCP server and the last assigned IP

is used.

Set the rotary switches to 888 to reset the encoder to factory settings. The default IP is 192.168.1.123.

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