Replacing RS3 DCS Flexterms with Opto22 SNAP I/O

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Started by gmitchell at 06-30-2004 9:19 AM. Topic has 0 replies.

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06-30-2004, 9:19 AM

gmitchell is not online. Last active: 11/12/2005 8:06:39 PM gmitchell

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Joined on 12-01-2003
Optomation Systems, Madrid, Spain
Posts 144

Replacing RS3 DCS Flexterms with Opto22 SNAP I/O

"Not convinced by Emersons RS3 to DeltaV "Special Offers" "Tired of RS3 repair policy and pricing" Don't worry, you are not alone...... Many RS3 customers do not bite to the RS3-DeltaV upgrade program aka "The RS3 Mortons Fork" One memorable quote from an RS3 customer after calculating the true costs of upgrading his RS3 to the DeltaV was "Its cheaper just to close the plant down"

Combining SNAP-B3000-MB from Opto22 with Emerson's (aka Fisher-Rosemount) RS3 control hardware allows customers to seamlessly integrate award winning SNAP hardware from Opto22 into their existing plant architecture and represents probably the best method of asset protection for existing installations.

SNAP hardware replaces previous generation RS3 I/O Flexterm hardware, which can be difficult to support or maintain. Some previous generations of Flexterm hardware are now unsupported by Emerson Process and upgrading to provide equivalent functionality usually involves costly software upgrades and in some cases changing control hardware.

Advantages of SNAP I/O when used with the RS3 DCS include:
· No external programming or configuration required
· Lower cost and technically superior I/O interface product.
· True optical isolation (4000VAC) per channel avoiding ground loop problems.
· Wide variety of I/O without signal conversion, including frequency and thermocouple measurements.
· Any voltage level for both AC/DC measurement · Digital: 25microsecond state change detection in the RS3
· Digital: High speed counting and totalizing independent of the MPC control processor.
· Analog: Thermocouple linearization (16-bit fixed point for linearized values)
· Directly replaces obsolete multiplexor hardware and FEMS
· Maintenance free and lifetime guarantee on all I/O modules
· Reduced footprint in existing system cabinets · Reduced power consumption
· Can be mounted remotely to free up existing cabinet rooms.
· Protects wiring investment as SNAP-IO can be connected to any other control system or directly to Ethernet TCP/IP at a later date.

SNAP-B3000-MB hardware connects directly to the RS3 using standard System 3 PLC interface hardware supported by the system hardware and software arquitecture. Each SNAP-B3000-MB brain can support up to 32 digital I/O and 32 analog I/O, or a mixture of both. The only limitations are those presented by the System 3, in terms of maximum number of interface blocks per controller and available processing power in the control blocks.

It is important to understand that SNAP-B3000-MB needs no additional programming or configuration. The only commands, which may be required such as decimal point scaling or update Eeprom are issued directly from RS3 control blocks.

Some RS3 customers have looked to include PLC hardware to provide a cheaper field interface for the RS3. Usually the results have not justified the work involved. The need for a specialized PLC programmer, support contracts, no single owner, inferior hardware and costly configuration errors are just some of the problems discovered. The SNAP-B3000-MB difference is that its SNAP-IO modules are intelligent. Each contains a microprocessor that informs the SNAP-B3000-MB processor where they are located on the rack and what signal type they interface. The SNAP-B3000-MB uses this information to automatically locate the associated values in a Modbus memory map, making process data available for any Modbus host such as the RS3 DCS system. The processor costs US$425 web list price to which must be added the cost of the necessary I/O modules & base board.

You can check out the product specsheet on the Opto22's web 1051_SNAP_Ana_Dig_Modbus_Slave.pdf
You can check out your nearest Opto22 representative from http://www.opto22.com/international/index.aspx

Besides representing Opto22 in Spain and Portugal, Optomation Systems has over 20 years experience of the RS3 system. We have produced an integration guide for RS3 configuration engineers, explaining connection, configuration, PLCB block examples, RS3 software version considerations etc. This is available free on request from [admin@optomation.es]. Having sucessfully used the product for many RS3 installed base customers, we are happy to provide free phone/email support for any problems encountered during installation.

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