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PD865 Application Note: Modbus Multivariable Transmitter Display and Alarming Systems

Get more from your network with a Snooper
Precision Digital’s model PD865 Snooper Modbus serial input meter is great for displaying important process variables from multivariable transmitters. In the system pictured below, three Snoopers are being used to display Level, Interface, and Temperature from a multivariable level transmitter. The Snoopers are mounted in a NEMA 4X enclosure, provided by Precision Digital, and are connected to a Precision Digital PD158 Vigilante II annunciator which provides alarm indication based on the relays in the Snoopers. The great thing about this system is everything is digital so the displays read exactly what is being measured and there is no need to ever calibrate the meters.


multivariable level transmitters

New Features

  • Snooper Mode: Listening for the PV you want
  • Proxy Polling Mode: Poll up to 8 PVs

Features

  • RS-485 Modbus® RTU input
  • Six full digits 999,999
  • Master, Slave, or Snooper mode
  • Sunlight readable LED display
  • Scale in engineering units
  • 16-point linearization
  • Square root & programmable exponent
  • Exact display of input data
  • 4-20 mA analog output option (Modbus® to 4-20 mA)
  • Two Form A relays standard
  • Two Form C relays option
  • Up to four pump alternation control
  • Universal power supply

Specifications for the above system:

Qty Model Description Price Total
1 PD865-6R2-06 Snooper in Master mode with two form A relays $259 $259
2 PD865-6R2-06 Snooper in Snooper mode with two form A relays $259 $498
1 PD158-6R2-1 Vigilante II 8-point Alarm Annunciator $399 $399
1 PDA2713 Steel NEMA 4X Enclosure $449 $449
1 PDL4161 Custom label for over enclosure (i.e. WEST-END STORAGE TANK) $25 $25
3 PDL1141 Custom label for meters (i.e. LEVEL, FEET) $25 $75

Notes:
1. Other enclosures available in plastic or stainless steel in various configurations for up to 12 meters.
2. Snoopers available with an additional two form C relays and 4-20 mA output and powered from 24 VDC
3. See www.predig.com/pd865 for complete details on the Model PD865 Snooper


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