Showing posts with label Communications. Show all posts
Showing posts with label Communications. Show all posts

Saturday, July 22, 2017

Fieldbus Equipped Instrumentation - Part One

Autonomous control and digital instrumentation are two capabilities enabling highly precise or complex execution of process control functions. FOUNDATION fieldbus instrumentation elevates the level of control afforded to digital field instrumentation where, instead of only communicating with each other, instruments involved in particular process control systems can independently facilitate algorithms typically reserved for instruments solely dedicated to controlling other instruments. Fieldbus capable instrumentation has become the standard instrumentation for many process industry installations due to the fact the FOUNDATION design principle streamlines process systems. A large contributor to FOUNDATION's success has been faster installation as opposed to operational controllers which do not feature the fieldbus configuration. Newer process companies, or process control professionals seeking to establish a new system, have gravitated towards fieldbus due to the combined advantages of system conciseness and ease of implementation.

In a typical digital control system, dedicated controllers communicate with field instrumentation (the HART protocol is a prime example of digital communication at work in the industry). The host system controls configuration of instruments and serves as a central hub where all relevant control decisions are made from a single dedicated controller. Typically, these networks connect controllers and field devices through coupling devices and other buses which streamline many different instruments into a complete system.

FOUNDATION fieldbus approaches the same network scheme with an important difference. Whereas in a legacy or more conventional system, either algorithmic or manual decisions would need to be implemented via the dedicated system level controllers, instruments utilizing FOUNDATION fieldbus architecture can execute control algorithms at the local device level. The dedicated controller hub is still present, so that operators can view and monitor the entire network concurrently and make status changes. Algorithmic execution of control functions becomes entirely device reliant thanks to the FOUNDATION protocol. Additionally, even though FOUNDATION implements an advanced configuration, some operators use the capabilities introduced in the fieldbus upgrade to implement specific algorithms via each device while concurrently maintaining algorithms in the central controller. This dual algorithmic configuration allows for several advantages, including the ability for increased system precision.

Since individual devices in the control process are calibrated and able to execute their own control functions, issues in the process with particular devices can be isolated and dealt with in a more specified manner by technicians using the instruments in the field. The central operator retains the capacity to use the control hub to alter and direct the control system.

For more information contact Flow-Tech in Maryland at 410-666-3200; in Virginia at 804-752-3450, or visit http://www.flowtechonline.com.

Watch for Part Two of this series to be posted soon.

Monday, June 20, 2016

Setting Up RS485 Communication Networks for Multiple Brooks Mass Flow Controllers


Brooks Instrument is a well known manufacturer of mass flow controllers & meters, variable area flow meters (rotameters), pressure & vacuum products, and vaporization products. Their products are found worldwide and in many industrial and R&D applications.  Many times multiple Brooks instruments are used on the same piece of equipment of control loop. Fo installation where multiple MFC's, pressure controllers, or meters are used, Brooks offers supplemental software and hardware to easily network the devices together. The following post provides instruction on setting up a RS485 communication network of Brooks devices.

The three main components required are:

  • The Brooks controller (MFC, pressure controller, etc ..)
  • Brooks Smart Interface software
  • Brooks Model 0260 power supply and converter


For networks with fewer than 10 Brooks devices:

For this part of the discussion, we'll call a small network one with 10 or fewer Brooks controllers. Setting up this type of network is easy - simply daisy-chain the devices and connect to the Model 0260. Then, connect the 0260 via USB to your computer or laptop. Example below:



For networks with 10 to 30 Brooks devices:

For a larger network of 10 devices or greater, the Brook 0260 powered converter should also be selected for best performance results. The 0260 power supply/converter from Brooks Instrument along with the Smart interface software can control up to 30 devices. Both of these products will communicate with any Brooks Instrument MFC or electronic pressure controller with the RS485 Smart Protocol, such as the GF40, GF80 and SLA5800 Series. Other than the 0260 power supply, the only piece of hardware required to set up the network is a multi-drop cable. The images below show different ways to set-up a network with more than 10 devices.

The Brooks Smart Interface software and hardware will work independently. For users that have their own software tools, the 0260 hardware can be used as a power source and signal converter. Additionally, the Brooks Smart Interface software can be used in conjunction with hardware already in place.

For more information on any Brooks Instrument product in Maryland or Virginia, contact:

Flow-Tech, Inc.
www.flowtechonline.com

Maryland Headquarters
10940 Beaver Dam Rd
Hunt Valley, MD 21030
Ph: 410-666-3200

Central VA Office
10993 Richardson Rd#13
Ashland, VA 23005
Ph: 804-752-3450