Instrumentation Systems


Today, plants need to lower operating cost, maximize capital investments, improve plant operations and manage assets to remain competitive.

Intelligent Instruments combined with Integrated Architecture allow; easy access to data without being on the plant floor, data sharing across the enterprise, high levels of process control and more accurate predictive maintenance cycles.

Whether a simple or complex instrumentation requirement Can-Technologies engineers design integrated architecture solutions using intelligent instruments. The following lists the most commonly used protocols:

The following highlights Can-Technologies range of services for new or retrofit instrumentation systems:

Here are more details about most commonly used protocols:

Foundation Fieldbus is an all-digital, serial, two-way communications system that serves as the base-level network in a plant or factory automation environment. It is an open architecture, developed and administered by the Fieldbus Foundation with two different physical media and communication speeds.

Foundation fieldbus was originally intended as a replacement for the 4-20 mA standard, but many delays in its development have prevented its large scale use, and has allowed other technologies such as Modbus, Profibus, and Industrial Ethernet to gain large installed bases. Foundation fieldbus was developed over a period of many years by ISA, as SP50.

PROFIBUS (PROcess FIeldBUS) is an industrial control network used for factory automation, process, motion control, and safety networks. Using master/slave architecture, utilizes a non-powered two-wire (RS-485) network. PROFInet is an Ethernet-based version of PROFIBUS that is designed to interface with business level systems.

PROFIBUS is standardized under the European Fieldbus Standard EN 50 170. It includes DP, and PA.

DeviceNet is a communication protocol used in the automation industry to interconnect control devices for data exchange. It uses Controller Area Network (CAN) as the backbone technology and defines an application layer to cover a range of device profiles.

DeviceNet was originally developed by American company Allen-Bradley (now owned by Rockwell Automation). It is layered on top of the CAN protocol, developed by Bosch.

DeviceNet is now managed by the Open DeviceNet Vendors Association (ODVA), an independent organization.

Modbus is a serial communications protocol published by Modicon in 1979 for use with its PLCs. Modbus allows for communication between many devices connected to the same network, for example a system that measures temperature and humidity and communicates the results to a computer. The main reasons for the extensive use of Modbus over other communications protocols are:

  • It is openly published and royalty-free
  • Relatively easy industrial network to deploy
  • It moves raw bits or words without placing many restrictions on vendors

Versions of the Modbus protocol exist for serial port and for Ethernet and other networks that support the Internet protocol suite. For connections over TCP/IP (e.g. Ethernet), the more recent variant Modbus/TCP exists. It does not require a checksum calculation.

HART (Highway Addressable Remote Transducer) originated by Rosemount in the late 1980’s and became an open protocol in 1990. Designed to compliment traditional 4-20mA analog signalling, the HART Protocol supports two way digital communications for process measurement and control devices. Applications include remote process variable interrogation, cyclical access to process data, parameter setting and diagnostics.

ASI (Actuator Sensor Interface) used to network sensors and actuators. ASi is a two wire interface; Power and Data. Based around ProfiSafe [developed from Profibus DP].ASI bus was developed by Siemens Automation. This is a Unshielded 2-wire [Yellow cable], Unterminated, Ungrounded Sensor Bus. The Topology may be either Bus, Ring, Tree, or Star at up to 100 meters. Power is provided by a 24V floating DC supply, which can supply at least 8 A over the network. The AS-Interface is an open standard based on IEC 62026-2 and EN 50295.

Wireless, there is considerable interest in wireless communication of data in industrial processes. Wireless sensors, in particular, have the following advantages when compared to their wired counterparts:

For some time, industrial applications have been successfully implemented using licensed radio frequencies at high cost and with significant administrative burden. With the development of many consumer products utilizing wireless communication technology, the availability of good quality, reasonably priced hardware has improved dramatically over the past few years. Wireless equipment, can be divided into three distinct groups.

It is important to understand the differences that exist in the field of electromagnetism or wireless. A wireless communication capability developed for one type application will most assuredly not apply successfully in a significantly different application.

Can-Technologies experienced group of specialist can provide you with engineered solution reflecting your plant floor requirements and improving your plant bottom line.

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