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PRECISION DIGITAL PD865 Instruction Manual

Modbus serial input
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SNOOPER MODEL PD865
MODBUS
®
Modbus
RTU Master, Slave, or Snooper Mode
6-Digit Display, 0.56" (14 mm) High, Red LEDs, Sunlight Readable
Linear, Square Root, or Programmable Exponent
16-Point Linearization
Maximum/Minimum Display
Type 4X, NEMA 4X, IP65 Front
Universal Power Supply 85-265 VAC
12-36 VDC/12-24 VAC Power Option
2 or 4 Relays + 4-20 mA Output Options
24 VDC Transmitter Power Supply Option
RS-485 Serial Communications
Proxy Polling for up to 8 Process Variables
PRECISION DIGITAL CORPORATION
89 October Hill Road • Holliston, MA 01746 USA
Tel (800) 343-1001 • Fax (508) 655-8990
®
SERIAL INPUT
Instruction Manual
www.predig.com

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  • Page 1 SNOOPER MODEL PD865 ® MODBUS SERIAL INPUT Instruction Manual  ® Modbus RTU Master, Slave, or Snooper Mode  6-Digit Display, 0.56" (14 mm) High, Red LEDs, Sunlight Readable  Linear, Square Root, or Programmable Exponent  16-Point Linearization ...
  • Page 2 Anyone using this product for such applications does so at his/her own risk. Precision Digital Corporation shall not be held liable for damages resulting from such improper use. Limited Warranty...

  • Page 3: Table Of Contents

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Table of Contents   INTRODUCTION ------------------------------------------------------------------------------------ 6   ORDERING INFORMATION -------------------------------------------------------------------- 6   SPECIFICATIONS --------------------------------------------------------------------------------- 7   General ------------------------------------------------------------------------------- 7   Operating Modes ----------------------------------------------------------------- 8   Programmable Features for Master Mode -------------------------------- 9  ...
  • Page 4 PD865 Snooper Modbus Serial Input Meter Instruction Manual   Setting the Float Decimal Point (Flot. . d p) ------------------------------ 37   Scaling the Display Value (scale) --------------------------------------- 38   Setting the Relay Operation (relay) ------------------------------------ 39   Relay and Alarm Operation ------------------------------------------------ 42  ...
  • Page 5 Figure 10: 4-20 mA Output Powered by Meter ......... 21   Figure 11: 4-20 mA Output Powered Externally ....... 21   Figure 12: PD865 Slave & Snooper Connected to a Master .... 59 Figure 13: PD865 Master Connected to a Smart Sensor & Chart   Recorder ....................59  ...

  • Page 6: Introduction

    4-20 mA output. As a Snooper the PD865 listens to the Modbus traffic and picks up a specific register or registers being polled by a Master device from a specific slave device and processes the data being read.

  • Page 7: Specifications

    PD865 Snooper Modbus Serial Input Meter Instruction Manual SPECIFICATIONS Except where noted all specifications apply to operation at +25°C. General Input/Output Modbus RTU over RS-485 DISPLAY Six digits, 0.56" (14 mm) high, red LED. Displays from -199999 to 999999, automatic leading zero blanking.

  • Page 8: Operating Modes

    PD865 Snooper Modbus Serial Input Meter Instruction Manual ENVIRONMENTAL Operating temperature range: -40 to 65°C Storage temperature range: -40 to 85°C Relative humidity: 0 to 90% non-condensing CONNECTIONS Removable screw terminal blocks accept 12 to 22 AWG wire. ENCLOSURE 1/8 DIN, high impact plastic,...

  • Page 9: Programmable Features For Master Mode

    This setting is used by Master and Slave modes. Serial Communications SLAVE ID 1 – 247. Specifies the ID or address of the slave device OR ADDRESS (Master or Snooper mode) or the address of the PD865 (Slave mode). BAUD RATE 300 – 19,200 bps DATA...

  • Page 10: Display Functions

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Functions INTENSITY 1 to 8. To optimize viewing based on ambient lighting conditions. DISPLAY d. ddddd, dd. dddd, Up to five decimal places: DECIMAL POINT ddd. ddd, dddd .dd, ddddd .d,...

  • Page 11: Relays

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Relays RATING Standard: 2 relays, SPST (Form A) Optional: 2 relays, SPDT (Form C) All relays are rated 3 A @ 30 VDC or 3 A @ 250 VAC, resistive loads. ELECTRICAL...

  • Page 12: Isolated 4-20 Ma Transmitter Output

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Isolated 4-20 mA Transmitter Output CALIBRATION Factory calibrated for 4-20 mA SCALING RANGE 1.000 to 23.000 mA for any display range. Reverse scaling allowed. ACCURACY ± 0.1% F.S. ± 0.004 mA TEMPERATURE 50 PPM/C from 0 to 65C ambient...

  • Page 13: Compliance Information

    PD865 Snooper Modbus Serial Input Meter Instruction Manual COMPLIANCE INFORMATION Safety UL LISTED USA and Canada UL 508 Industrial Control Equipment UL FILE NUMBER E160849 FRONT PANEL UL Type 4X, NEMA 4X, IP65; panel gasket provided SAFETY INFORMATION CAUTION: Read complete...

  • Page 14: Installation

    PD865 Snooper Modbus Serial Input Meter Instruction Manual INSTALLATION There is no need to remove the meter from its case to complete the installation, wiring, and setup of the meter. Unpacking Remove the meter from box. Inspect the packaging and contents for damage.

  • Page 15: Mounting Dimensions

    PD865 Snooper Modbus Serial Input Meter Instruction Manual MOUNTING DIMENSIONS 865SideViewDim Figure 2: Meter Dimensions – Side View Figure 3: Case Dimensions – Top View...

  • Page 16: Connections

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Connections All connections are made to removable screw terminal connectors located at the rear of the meter. Use copper wire with 60°C or 60/75°C insulation for all line voltage connections. Observe all safety regulations.

  • Page 17: Power Connections

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Power Connections Power connections are made to a two-terminal connector labeled POWER in Figure 2. The meter will operate regardless of DC polarity connection. The + and - symbols are only a suggested wiring convention.

  • Page 18: Serial Connections

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Serial Connections The PD865 is connected to an RS-485 bus with up to 32 nodes. For systems consisting of more than 32 nodes, RS-485 repeaters are necessary. Wiring connections to the PD865 are made via the three position screw terminal connector labeled RS-485.

  • Page 19: Relay Connections

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Relay Connections Connections to the two, standard Form A relays, are made to the connector labeled RLY1 and RLY2. See Figure 5. Connections to the two optional Form C relays are made to the six-terminal connector labeled RELAY3 and RELAY4.

  • Page 20: Figure 9: Low Voltage Dc Loads Protection

    Instruction Manual Figure 9: Low Voltage DC Loads Protection RC Networks Available from Precision Digital RC networks are available from Precision Digital and should be applied to each relay contact switching an inductive load. Part number: PDX6901. Note: Relays are de-rated to 1/14th HP (50 watts) with an inductive load.

  • Page 21: 4-20 Ma Output Connections

    PD865 Snooper Modbus Serial Input Meter Instruction Manual 4-20 mA Output Connections Connections for the 4-20 mA transmitter output are made to the connector terminals labeled “mA OUT, I-, I+”. The 4-20 mA output may be powered from an internal power supply (optional) or from an external power supply.

  • Page 22: Setup And Programming

    PD865 Snooper Modbus Serial Input Meter Instruction Manual SETUP AND PROGRAMMING  There is no need to recalibrate the 4-20 mA output (when installed) as received from the factory.  The 4-20 mA output is factory calibrated prior to shipment. The calibration equipment is certified to NIST standards.

  • Page 23: Front Panel Buttons And Status Led Indicators

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Front Panel Buttons and Status LED Indicators Button Description Status Symbol Menu Alarm 1 Right arrow/Reset Alarm 2 Up arrow/Max Alarm 3 Enter/Ack Alarm 4 Set point indicator Reset point indicator ...

  • Page 24: Display Functions And Messages

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Functions and Messages The meter displays various functions and messages during setup/programming and operation. The following table shows the displayed functions and messages with their action/setting description. Display Parameter Action/Setting nmodE Mode Enter the Mode menu.
  • Page 25 PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Parameter Action/Setting Reg. P v4 Enter the Register Number for PV4. Register Reg. P v5 Enter the Register Number for PV5. Register Reg. P v6 Enter the Register Number for PV6.
  • Page 26 PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Parameter Action/Setting 2143 Byte Order Select byte-swapped big-endian byte order. Not available for Short integer. 3412 Byte Order Select byte-swapped little-endian byte order. Not available for Short integer. T-PoLL Poll Time Enter the time between read commands.
  • Page 27 PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Parameter Action/Setting Disp. d p Display Set the decimal point position for the display. Decimal This is independent from float decimal point. Point FLot. d P Float Select the decimal point for the expected floating Decimal point data.
  • Page 28 PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Parameter Action/Setting DLY 1 Relay 1 Enter relay 1 time delay setup. Similar menus for Delays Relays 2 to 4 are not shown here. on 1 Relay 1 Set relay 1 On time-delay.

  • Page 29: Main Menu

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Main Menu The main menu consists of the most commonly used functions: Mode, Serial, Program, and Password.  Press Menu button to enter Meter Programming then press Up arrow button to scroll through the main menu.

  • Page 30: Meter Setup

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Meter Setup Operating Modes (nmode) The Mode menu is used to select how the meter is to function: 1. Master: Reads a slave device, scales the data from it, displays the result, and operates the relays and 4-20 mA output.

  • Page 31: Master Mode (Nmastr)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Master Mode (nmastr) The Master mode contains the following submenus: select which Function Code to use, the number of PVs to poll, the slave IDs and register numbers, the type and format of data for PV1, the slave Polling time and Response timeout.

  • Page 32: Proxy Polling Mode

    Proxy Polling mode is enabled when a number greater than 1 is entered in the PUnbr (number of PV's) menu. In this mode, the PD865 acts as a Master and polls up to an additional 7 slave devices, enabling other PD865s, operating in Snooper mode, to read and display that polled data.
  • Page 33 PD865 Snooper Modbus Serial Input Meter Instruction Manual The following table shows the system setup for the MTS M-Series gauge, the PD865 Master, and the two PD865 Snoopers: Parameter PD865 PD865 PD865 Master Snooper 1 Snooper 2 Mode Master Snooper...

  • Page 34: Slave Mode (Slave)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Slave Mode (Slave) The Slave mode is capable of accepting Long and Float data types. Refer to the Slave Mode Register Table for details of all the predefined parameters. slave SLAv. 1 d data.

  • Page 35: Snooper Mode (Snoopr)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Snooper Mode (Snoopr) The Snooper mode is used to listen to data being transmitted on the bus. Multiple Snoopers can be connected to the RS-485 bus and display any process variable. The same process variable can be displayed in multiple locations.

  • Page 36: Serial Communications (Serial)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Serial Communications (SEriAL) The meter has an RS-485 interface. The baud rate, parity, and byte-to- byte timeout can be programmed. Serial Press Enter/Ack to Make Selections baud parity t-byte Press Up Arrow to...

  • Page 37: Setting The Display Decimal Point (Disp

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Setting the Display Decimal Point (disp. . d p) Decimal point may be set one to five decimal places or with no decimal point at all. Pressing the Up arrow moves the decimal point one place to the right until no decimal point is displayed, and then it moves to the leftmost position.

  • Page 38: Scaling The Display Value (Scale)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Scaling the Display Value (scale) The data that the meter receives can be scaled to display in engineering units. Input 1 must be less than Input 2; Input 2 must be less than Input 3;...

  • Page 39: Setting The Relay Operation (Relay)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Setting the Relay Operation (relay) This menu allows you to set up the operation of the relays: Relay action: Automatic reset only, Automatic + manual reset, Latching, Latching with Clear, Pump alternation control, Off.
  • Page 40 PD865 Snooper Modbus Serial Input Meter Instruction Manual Setting the Relay Action The relays Action menu allows the user to set up the operation of the relays. The relays may be set up for any of the following modes of...
  • Page 41 PD865 Snooper Modbus Serial Input Meter Instruction Manual Setting Fail-Safe Operation The fail-safe operation is set independently for each relay. Select on to enable or select off to disable fail-safe operation. failsf Fls 1 Fls 4 Same Menus for Relays...

  • Page 42: Relay And Alarm Operation

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Relay and Alarm Operation The following graphs illustrate the operation of the relays, status LEDs, and Acknowledge (ACK) button. High Alarm Operation (Set > Reset) Input Reset de-energized energized Relay Automatic (non-latching)
  • Page 43 PD865 Snooper Modbus Serial Input Meter Instruction Manual Low Alarm Operation (Set < Reset) Input Reset de-energized energized Relay Automatic (non-latching) Relay pressed Automatic or Manual (non-latching) Relay pressed Manual (latching) Relay pressed Manual only after passing above Reset (latching) In Manual mode, ACK can be pressed anytime to turn the relay "off".
  • Page 44 PD865 Snooper Modbus Serial Input Meter Instruction Manual Time Delay Operation The following graphs show the operation of the time delay function. Input Reset <Tdelay <Tdelay >=Tdelay Relay On Time Delay Input Reset <Tdelay <Tdelay >=Tdelay Relay Off Time Delay If the signal crosses the set point, the On time delay timer starts and the relay trips when the time delay has elapsed.
  • Page 45 PD865 Snooper Modbus Serial Input Meter Instruction Manual High Alarm with Fail-Safe Operation (Set > Reset) Input Reset de-energized energized Relay Automatic (non-latching) Relay pressed Automatic or Manual (non-latching) Relay pressed Manual (latching) Relay pressed Manual only after passing below Reset (latching) Fail-safe operation: relay coil is energized in non-alarm condition.
  • Page 46 PD865 Snooper Modbus Serial Input Meter Instruction Manual Low Alarm with Fail-Safe Operation (Set < Reset) Input Reset de-energized energized Relay Automatic (non-latching) Relay pressed Automatic or Manual (non-latching) Relay pressed Manual (latching) Relay pressed Manual only after passing above Reset (latching) Fail-safe operation: relay coil is energized in non-alarm condition.
  • Page 47 PD865 Snooper Modbus Serial Input Meter Instruction Manual...
  • Page 48 PD865 Snooper Modbus Serial Input Meter Instruction Manual Relay Operation After Communications Break When a Master meter fails to receive a reply from the slave it is called a Communications Break. The relays can be programmed to react to this event by going On, Off, or No Action.

  • Page 49: Scaling The 4-20 Ma Analog Output (Aout)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Scaling the 4-20 mA Analog Output (Aout) The 4-20 mA analog output can be scaled to provide a 4-20 mA signal for any display range selected. No equipment is needed to scale the analog output;...

  • Page 50: Setting Up The Password (Pass)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Setting Up the Password (pass) The Password menu is used to program a four-digit password to prevent unauthorized changes to the programmed parameter settings. Locking the Meter Enter the Password menu and program a four-digit password.

  • Page 51: Unlocking The Meter

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Unlocking the Meter If the meter is password protected, the correct password must be entered in order to make changes to the parameter settings. 3 seconds Return pass loCd 0000 unloC to Run...

  • Page 52: Advanced Features Menu

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Advanced Features Menu To simplify the setup process, functions not needed for most applications are located in the Advanced Features menu: Display Function, Noise Filter, Noise Filter Bypass, Cutoff, Analog Output Programming, Display Intensity, and Information.

  • Page 53: Advanced Features Menu & Display Messages

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Advanced Features Menu & Display Messages Display Parameter Action/Setting funC Function Enter Display Function menu. Linear Linear Select Linear Display Function. no Pts Enter the number of points for Linear Display Number of Points Function (2 to 16).

  • Page 54: Display Math Function (Func)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Parameter Action/Setting nmin Min Analog Enter the minimum value allowed for the Output Analog Output. CALib Calibration Enter the Analog Output Calibration menu. nman Perform a manual calibration on the Analog Manual Output.

  • Page 55: Noise Filter (Filter)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Noise Filter (filter) Most applications do not require changing this parameter. It is intended to help attain a steady display with an unsteady (noisy) input data. The field selectable noise filter averages any minor or quick changes in the input data and displays the reading with greater stability.

  • Page 56: Analog Output Programming (Aoutpr)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Analog Output Programming (aoutpr) The 4-20 mA analog output can be programmed for its source of data, overrange and underrange, absolute max and min output, and communications break values. It can also be calibrated manually or automatically.

  • Page 57: 4-20 Ma Output Calibration

    4-20 mA output could be adversely affected. 4-20 mA Output Calibration Procedure Wire the PD865 4-20 mA output to a current loop that includes a power supply (internal or external 12 to 24 VDC), and the current input on the digital meter.

  • Page 58: Display Intensity (D-Inty)

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Intensity (d-inty) The Display Intensity function allows the selection of eight levels of intensity for various lighting conditions. D-inty int1 int2 int8 Information (info) The Information menu shows the firmware, version, and serial numbers.

  • Page 59: Operation

    Instruction Manual OPERATION The PD865 meter is capable of operating as a Modbus Master, Slave or Snooper. As a Slave, the PD865 requires connection to a Master device: PLC, DCS, etc. As a Master, the PD865 interfaces up to eight slave devices.

  • Page 60: Figure 14: Pd865 Master Connected To A Pd765 Meter

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Figure 14: PD865 Master Connected to a PD765 Meter Figure 15: PD865 Master & Snoopers Connected to Multivariable Level Transmitters...

  • Page 61: Figure 16: Pd865 Master & Snoopers Connected To Level And Temperature Sensors

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Figure 16: PD865 Master & Snoopers Connected to Level and Temperature Sensors...

  • Page 62: Maximum/Minimum Readings

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Maximum/Minimum Readings The primary function of the front panel buttons during operation is to display the maximum and minimum readings reached by the process or temperature inputs. Present Reading 2468 9865 10 Sec Time Out Press Up arrow/Max button to display maximum reading since the last reset/power-up.

  • Page 63: Troubleshooting

    PD865 Snooper Modbus Serial Input Meter Instruction Manual TROUBLESHOOTING If the meter is not working as expected, refer to the troubleshooting tips on page 68. Determining Software Version To determine the software version of the meter: Go to the Information menu (info) in the Advanced Features menu and press the Enter/Ack button.

  • Page 64: Factory Defaults & User Settings

    PD865 Snooper Modbus Serial Input Meter Instruction Manual Factory Defaults & User Settings The following table shows the factory setting for most of the programmable parameters on the meter. Next to the factory setting, the user may record the new setting for the particular application. Note that all settings are loaded with a default value, even though some settings may not be used.
  • Page 65 PD865 Snooper Modbus Serial Input Meter Instruction Manual Parameter Display Default Setting User Setting Input 3 300.00 Display 3 300.00 Input 4 400.00 Display 4 400.00 Input 5 500.00 Display 5 500.00 Input 6 600.00 Display 6 600.00 Input 7 700.00...
  • Page 66 PD865 Snooper Modbus Serial Input Meter Instruction Manual Parameter Display Default Setting User Setting dis 16 Display 16 1600.00 Relay 1 Action** Automatic Relay 1 fls 1 Failsafe** Relay 1 on 1 0 seconds On-Delay** Relay 1 off 1 0 seconds...
  • Page 67 PD865 Snooper Modbus Serial Input Meter Instruction Manual Advanced Features Display funC Linear Function Number of no pts Points filter Filter bypass Bypass 0.2% CutofF Cutoff 0.00 (disabled) 4-20 mA: sourCe Display value Data Source 4-20 mA: O-rang 21.000 mA...

  • Page 68: Troubleshooting Tips

    Meter displays error message during scaling (error). Check master data type setting. Make Master displays a different value sure it matches the PD865 data type than PD865 display. found in the Register Table. Check PD865 data type setting. Make PD865 Master displays a different sure it matches the slave data type.

  • Page 79: Register Table Notes

    PD865 Modbus Snooper Serial Input Meter Instruction Manual Register Table Notes Note 1. Although there are no specific 3x registers listed, all 4x Registers are mirrored into 3x register space, and are therefore capable of being read by Modbus function 04 (Read Input Registers). Register addresses in Modbus messages are referenced to zero (0), while Register numbers are referenced to one (1).
  • Page 80 PD865 Modbus Snooper Serial Input Meter Instruction Manual Float decimal point setting is found in Holding Register 40028. Examples using Float (register values are shown in hexadecimal): Displayed Register Register Process Value 40001 - 40002 40013 1.234 3F9D F3B6 0003 12.34...

  • Page 81: Register Bit Assignment Tables

    PD865 Modbus Snooper Serial Input Meter Instruction Manual Register Bit Assignment Tables Table 1. Display Decimal Point and Float Decimal Point Bit(s) 15 – 3 2 – 0 Description 0 – 0 Decimal 0 = dddddd 1 = ddddd.d 2 = dddd.dd 3 = ddd.ddd...
  • Page 82 PD865 Modbus Snooper Serial Input Meter Instruction Manual Table 3. Serial Settings Note that the Bus Type is not implemented in either hardware or firmware in this version. Bit(s) 15 – 8 5 – 4 2 – 0 Description 0 – 0...
  • Page 83 PD865 Modbus Snooper Serial Input Meter Instruction Manual Table 5. 4-20mA Output Modes For the Serial Communications sources: Register 40313 holds the data, either as μA (0 to 23999 Ξ 0.000 to 23.999 mA) or DAC bits (0 to 65535). The DAC (Digital to Analog Converter) used for the 4-20 mA generation is updated whenever data is written to Register 40313.
  • Page 84 PD865 Modbus Snooper Serial Input Meter Instruction Manual How to Contact Precision Digital  For Technical Support: Call: (800) 610-5239 or (508) 655-7300 Fax: (508) 655-8990 Email: support@predig.com  For Sales Support or to place an order: Call: (800) 343-1001 or (508) 655-7300 Fax: (508) 655-8990 Email: sales@predig.com...

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