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  • 产品名称：PD865: Snooper Serial Input Modbus Meter 总线Modbus表

  • 产品型号：PD865
  • 产品厂商：PRECISION
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简单介绍：
Expand the capability of other Modbus RTU serial devices with the new PD865 Snooper. It has a 6-digit sunlight readable display and may be set up as a master or slave. The PD865 comes with RS-485 comm
详情介绍：


new and improved logo snooper logo

Modbus Serial Input Meter PD865 Snooper
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Precision Digital Corporation wireless ready Modbus Serial Input Meter PD865 Snooper: UL Mark for Canada and the United States


In Snooper mode, the PD865 listens to Modbus traffic and grabs a process variable being transmitted on the bus

 

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
     

Great for Multivariable Transmitters!

 
 

WHAT IS A SNOOPER?

The PD865 Snooper is a digital panel meter that can be programmed as a Modbus RTU Master, Slave or Snooper

What Makes Snooper Mode Special?

In Snooper mode, the Snooper can sit anywhere on the Modbus network and display any process variable on the bus. The special thing about Snooper mode is you don’t have to change the programming of the other and it constantly monitors that location and displays the PV on the digital readout

pd865

 

APPLICATIONS

Master and Snooper Modes


PD865 applications


In this application, the PD865 at the top is acting as the Master and requests eight process variables (level & temperature) by polling four multivariable tank level sensors. Seven of these variables are polled by the master on behalf of the seven PD865s acting in Snooper mode (a process called proxy polling). The seven PD865s display specific data captured during the polling process without detection by, or interfering with, either the master or slaves on the network

Custom Snooper in Level Application

The Snooper shown here has been modified so it displays Feet, Inches, and 16ths of an inch from a level transmitter. Please contact the factory if you have a custom application

custom snooper in level application
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see the Snooper
Application video

Multivariable Level Transmitters


multivariable level transmitters


The top Snooper is displaying product level and it is set up as a master device to the level transmitter’s slave device. The next two Snoopers are set up in Snooper mode and they are displaying interface and product temperature. Each Snooper’s two relays are connected to the PD158 annunciator to indicate alarm conditions

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In Slave & Snooper Modes with PLC Master


Typical Install Slave C


Modbus Serial Input Meter PD865 Snooper Keep it Simple, Keep it Digital With the Snooper....
Many digital process meters get their 4-20 mA input from a PLC. This requires a costly analog output card in the PLC and also degrades the accuracy of the signal as it is converted from digital to analog and then back to digital. Using a Snooper in these applications means the PLC communicates digitally with the digital display


Modbus to 4-20 mA Converter


Modbus to 4-20 mA Converter


The Snooper can be equipped with a 4-20 mA output option which will convert the serial input to the Snooper into an isolated 4-20 mA output

Remote Display for Process Meter


remote display for process meter

The Snooper can be connected to the Modbus serial output from devices like digital panel meters, temperature controllers, flow indicators, etc to provide indication of the process at another location. The advantage of going digital, is both indicators always read the same value. If an analog output is used, the two displays often read different values


Alternate up to Four pumps


alternate up to 4 pumps


The Snooper, in conjunction with a Modbus output level transmitter, can be used to control and alternate up to four pumps. In the application above, the Snooper’s two Form C relays are being used to control and alternate the Main and Backup pumps, and the Snooper’s two Form A relays are being used for High and Low Alarm


Multi-Point Linearization


multi-point linearization

The Snooper's multi-point linearization feature can be used to display the volume in a round horizontal tank or any other non-linear vessel. In addition, it can generate a 4-20 mA output that is linear to volume


 

CONNECTIONS

connection diagram



 

MOUNTING DIMENSIONS

Modbus Serial Input Meter PD865 Snooper: Quick Installation and Diagram
Notes:
1. Panel cutout required: 1.772" x 3.622" (45 x 92 mm)
2. Panel thickness: 0.040" - 0.250" (1.0 mm - 6.4 mm)
3. Mounting brackets lock in place for easy mounting


 
 

SPECIFICATIONS

Except where noted all specifications apply to operation at +25°C

General

Input/Output: Modbus RTU RS-485
Display: 0.56" (14.2 mm) red LED, 6 digits; displays from -199999 to 999999, automatic leading zero blanking
Display Intensity: Eight user selectable intensity levels
Display Decimal Point: Up to five decimal places: d.ddddd, dd.dddd, ddd.ddd, dddd.dd, ddddd.d, or dddddd
Float Decimal Point: Select the number of decimals to use for the floating point data expected from the slave or master device
Front Panel: NEMA 4X, IP65; panel gasket provided
Programming Methods: Four front panel buttons or via Modbus registers (Slave mode only)
Scaling: Input may be scaled from -199,999 to 999,999
Math Functions: Linear, square root, or programmable exponent from 0.50000 to 2.99999
Multi-Point Linearization: 2 to 16 points
Noise Filter: Programmable 2 to 199 (0 will disable filter)
Bypass: 0.2 to 99.9% of full-scale
Cutoff: 0 to 999999; 0 disables cutoff
Display Update Rate: Master: 10/sec to 1 every 25.5 seconds;
Slave and Snooper: Dependent on master device (PLC, DCS, RTU, etc)
Overrange: Display flashes 999999
Underrange: Display flashes -199999
Max/Min Display: Stored until reset by user or meter is turned off; user can reset by front panel buttons or via Modbus registers.
Password: Restricts modification of programmed settings.
Non-Volatile Memory: Settings stored for a minimum of 10 years.
Power Options: 85-265 VAC, 50/60 Hz; 90-265 VDC, 20 W max or 12-36 VDC; 12-24 VAC, 6 W max.
Required Fuse: UL Recognized, 5 A max, slow-blow; up to 6 meters may share one fuse.
Normal Mode Rejection: 64 dB at 50/60 Hz
Transmitter Supply: Isolated 24 VDC ±10% @ 200 mA max
Isolation: 4 kV input/output-to-power line, 500 V input-to-output or output-to-24 VDC supply
Operating Temperature: -40 to 65°C
Storage Temperature: -40 to 85°C
Relative Humidity: 0 to 90% non-condensing
Connections: Removable screw terminals accept 12 to 22 AWG
Enclosure: 1/8 DIN, high impact plastic, UL 94V-0, color: gray
Weight: 9.7 oz (275 g) (including options)
UL File Number: E160849; 508 Industrial Control Equipment
Warranty: 3 years parts & labor

Operating Modes

Master: Processes data read from a Modbus RTU slave device (only one process variable at a time can be displayed on the master).
Master Proxy Polling: Polls up to 8 process variables up to 8 slave devices. The Master processes and displays one PV and allows other PD865s in Snooper mode to read any of the variables being polled.
Snooper: Listens to the Modbus traffic and picks up a specific process variable being polled by a Master device from a specific slave device and processes the data being read.
Slave: Processes data sent from a Modbus RTU master device.
Note that the relays and the 4-20 mA output are functional in all modes.

Master and Snooper Modes Settings

Function Code: Modbus function code 03 or 04.
Number of PVs: Number of process variables to be polled (PV1-PV8)
Slave ID: Address (1-247) of up to 8 slave devices
Register Number: 1 to 65536. Specifies which register(s) to read in the slave device. Register number is preceded by register type (3xxxxx or 4xxxxx). Five or six digit register number allowed.
Data Type: Select the data format that the slave device uses; select between Short (2 byte) and Long (4 byte) Integers or Floating point (4 byte), Signed or Unsigned (integer only), and byte order (big-endian vs little-endian).
Slave Response Timeout: 0 to 25.4 seconds.This is the time allowed for slave to respond to a command. 0 disables timeout (Master Mode Only)
Poll Time: 0.1 to 25.5 seconds between read commands

Relays

Rating: 2 Form A (SPST) standard; 2 Form C (SPDT) optional; rated 3 A @ 30 VDC or 3 A @ 250 VAC, resistive loads; 1/14 HP @ 125/250 VAC inductive loads
High or Low Alarm: User may program any alarm for high or low
Deadband: 0-100% FS, user selectable
Relay Operation:
1. Automatic (non-latching)
2. Latching
3. Pump alternation control (up to 4 relays)
Relay Reset: Selectable via front panel or Modbus registers
1. Automatic reset only (non-latching)
2. Automatic plus manual reset at any time (non-latching)
3. Manual reset only, at any time (latching)
4. Manual reset only after alarm condition has cleared (latching)
Automatic Reset: Relays reset when input passes the reset point
Manual Reset: Front panel button, Modbus registers (Slave only)
Time Delay: 0 to 199 seconds, on and off delays, programmable and independent for each relay
Fail-Safe Operation: Programmable, independent for each relay
Communications Break: No change, Relay on, or Relay off. Controls the condition the relay goes to when a slave device does not reply (Master and Snooper modes).
Auto Initialization: When power is applied to the meter, relays will reflect the state of the input to the meter

Serial Communications

Compatibility: EIA-485 (RS-485)
Protocol: Modbus RTU
Slave ID or Address: 1 to 247. Specifies the ID or address of the slave device (Master and Snooper modes) or the address of the PD865 (Slave mode).
Baud Rate: 300 to 19,200 bps
Data: 8 bits (1 start bit, 1 stop bit; 1 or 2 stop bits with no parity)
Parity: None, even, or odd
Byte-to-Byte Timeout: 0.01 to 2.54 seconds
Turn Around Delay: Less than 2 ms (fixed)

Isolated 4-20 mA Transmitter Output

Scaling Range: 1.000 to 23.000 mA; reverse scaling allowed.
Calibration: Factory calibrated 4.000 to 20.000 mA
Accuracy: ±0.1% FS ±0.004 mA
Recalibration: Recommended at least every 12 months.
Temperature Drift: 50 PPM/°C
Transmitter Supply: Isolated 24 VDC ±10% @ 200 mA max
Isolation: 500 V input-to-output or output-to-24 VDC supply; 4 kV output-to-power line
External Loop Power Supply: 35 VDC maximum
Output Loop Resistance:
  Loop Resistance
Power Supply Minimum Maximum
24 VDC 10 Ω 700 Ω
35 VDC (external) 100 Ω 1200 Ω  

Data Source: Display value, maximum display value, minimum display value, or Modbus register
Overrange: Programmable mA output for overrange condition
Underrange: Programmable mA output for underrange condition
Communications Break: Programmable mA output when a slave device does not reply within the Slave Response Timeout
Maximum Output: Programmable absolute maximum mA output
Minimum Output: Programmable absolute minimum mA output

Disclaimer
The Information contained in this document is subject to change without notice. Precision Digital Corporation makes no representations or warranties with respect to the contents hereof, and specifically disclaims any implied warranties of merchantability or fitness for a particular purpose


 
 

ORDERING INFORMATION

Products
Model Description  
PD865-6R2-06        Snooper Modbus Meter; No Options; Powered from 85-265 VAC         
PD865-6R5-16        Snooper Modbus Meter; 4-20 mA Output + 24 VDC Transmitter Supply; Powered from 85-265 VAC         
PD865-6R7-16        Snooper Modbus Meter; 2 Relays, 4-20 mA Output + 24 VDC transmitter Supply; Powered from 85-265 VAC         
PD865-7R5-06        Snooper Modbus Meter; 4-20 mA Output; Powered from 12-36 VDC         
PD865-7R7-06        Snooper Modbus Meter; 2 Relay + 4-20 mA Output; Powered from 12-36 VDC         
  

Enclosures
PDA2300 Enclosure Family Enclosure Selection Utility
Model Description  
PDA2302        Economical Plastic NEMA 4X Enclosure for 2 Type A, B, C, or E Meters         
PDA2303        Economical Plastic NEMA 4X Enclosure for 3 Type A, B, C, or E Meters         
PDA2304        Economical Plastic NEMA 4X Enclosure for 4 Type A, B, C, or E Meters         
PDA2305        Economical Plastic NEMA 4X Enclosure for 5 Type A, B, C, or E Meters         
PDA2306        Economical Plastic NEMA 4X Enclosure for 6 Type A, B, C, or E Meters         
PDA2307        Economical Plastic NEMA 4X Enclosure for 7 Type A, B, C, or E Meters         
PDA2308        Economical Plastic NEMA 4X Enclosure for 8 Type A, B, C, or E Meters         
PDA2309        Economical Plastic NEMA 4X Enclosure for 9 Type A, B, C, or E Meters         
PDA2310        Economical Plastic NEMA 4X Enclosure for 10 Type A, B, C, or E Meters         
PDA2312        Economical Plastic NEMA 4X Enclosure for 2 Type A, B, C, or E Meters         
PDA2322        Economical Plastic NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2407        Plastic NEMA 4X Enclosure for 1 Meter (Any Type)         
PDA2411        Plastic NEMA 4X Enclosure for 2 Meter (Any Type)         
PDA2414        Plastic NEMA 4X Enclosure for 1 Type D + 1 Type A, B, C or E Meter         
PDA2501        Plastic NEMA 4X Enclosure for 1 Type C Meter         
PDA2502        Plastic NEMA 4X Enclosure for 2 Type C Meters         
PDA2503        Plastic NEMA 4X Enclosure for 3 Type C Meters         
PDA2504        Plastic NEMA 4X Enclosure for 4 Type A, B, C, or E Meters         
PDA2505        Plastic NEMA 4X Enclosure for 5 Type A, B, C, or E Meters         
PDA2506        Plastic NEMA 4X Enclosure for 6 Type A, B, C, or E Meters         
PDA2507        Plastic NEMA 4X Enclosure for 7 Type A, B, C, or E Meters         
PDA2508        Plastic NEMA 4X Enclosure for 8 Type A, B, C, or E Meters         
PDA2509        Plastic NEMA 4X Enclosure for 9 Type A, B, C, or E Meters         
PDA2510        Plastic NEMA 4X Enclosure for 10 Type A, B, C, or E Meters         
PDA2512        Plastic NEMA 4X Enclosure for 2 Type A, B, C, or E Meters         
PDA2522        Plastic NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2601        Stainless Steel NEMA 4X Enclosure for 1 Type C Meter         
PDA2602        Stainless Steel NEMA 4X Enclosure for 2 Type C Meters         
PDA2603        Stainless Steel NEMA 4X Enclosure for 3 Type C Meters         
PDA2604        Stainless Steel NEMA 4X Enclosure for 4 Type A,B, C or E Meters         
PDA2605        Stainless Steel NEMA 4X Enclosure for 5 Type A,B, C or E Meters         
PDA2606        Stainless Steel NEMA 4X Enclosure for 6 Type A,B, C or E Meters         
PDA2622        Stainless Steel NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2701        Steel NEMA 4 Enclosure for 1 Type C Meter         
PDA2702        Steel NEMA 4 Enclosure for 2 Type C Meters         
PDA2703        Steel NEMA 4 Enclosure for 3 Type C Meters         
PDA2704        Steel NEMA 4 Enclosure for 4 Type A, B, C, or E Meters         
PDA2705        Steel NEMA 4 Enclosure for 4 Type A, B, C or E Meters         
PDA2706        Steel NEMA 4 Enclosure for 5 Type A, B, C or E Meters         
PDA2722        Steel NEMA 4X Enclosure for 1 Type D + 1 Type C Meter         
PDA2801        Low-Cost Plastic NEMA 4X Enclosure for 1 Type C Meter         
PDA2811        Low-Cost Plastic NEMA 4X Enclosure for 1 Meter (Type A, B, C or E)         
PDA2812        Low-Cost Plastic NEMA 4X Enclosure for 2 Meters (Any type)         
PDA2821        Low-Cost Plastic NEMA 4X Enclosure for 1 Type D Meter + 1 Type A, B, C or E Meter         
  

Accessories
Model Description  
PDA7485-I        RS-232 to RS-422/485 Isolated Converter         
PDA7485-N        RS-232 to RS-422/485 Non-Isolated Converter         
PDA8485-I        USB to RS-422/485 Isolated Converter         
PDA8485-N        USB to RS-422/485 Non-Isolated Converter         
PDX6901        Suppressor (snubber): 0.01µF/470Ω,         

 

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