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PDW30 Point-to-Point Wireless Process Signal Bridge

Manual

The Precision Digital PDW30 gives you a simple, straightforward way to get an analog, discrete, or Modbus® signal from where you have it to where you need it. It's a point-to-point wireless bridge packaged in a rugged, weather-tight housing that is designed to meet the demands of industrial installations.

The PDW30 is simple to order, simple to configure, and easy to trust with your application. Guaranteed ranges assure it will work with your application or you can send it back - no questions asked. A wireless survey tool is available for those installations that require a site survey for longer distances, making it easy to verify the setup will work the first time.

The primary unit accepts an analog, discrete, or Modbus® input and wirelessly broadcasts it to the secondary unit. The secondary unit then recreates that signal at its location. Just put the units in the field wherever you have a process signal and 24 VDC power.

Fixed or remote antenna modules as well as a wide range of accessories are available, including mounting kits, antenna-related accessories, and repeaters. The antenna may be directly attached or remotely located. High gain directional antennas are also offered.

Features

  • Signal Wire Replacement in a Rugged, Industrial Housing
  • Inputs and Outputs on Both Field Units
  • Simple to Order, Configure, & Install
  • 1 Mile Line-of-Sight Outdoor, 500 Ft Indoor Range
  • Inputs: Analog (4-20 mA, 0-10 V, 0-5 V, 1-5 V), Digital, and RS-485 Modbus Communications
  • Outputs: Analog (4-20 mA), Digital, and RS-485 Modbus® Communications
  • Remote or Attached Antenna
  • Repeaters and Directional Antennas Available
  • Flanges for Wall or Pipe Mounting
  • Software Available for Even Easier Setup
  • NEMA 4X, IP68 Enclosure

General

Display

32-character dual-line alphanumeric dot matrix LCD display with backlight (4.68mm x 2.21mm characters)

Display Orientation

Display may be mounted at 180° from default orientation

Network ID

Field selectable: 0 - 99

Programming Methods

Four programming buttons (behind glass) or PC with PDW Manager software.

Recalibration

All inputs and outputs are calibrated at the factory. Recalibration is recommended at least every 12 months.

Process/ Digital I/O Display

Press the display button once to display the present analog input and output. Press the display button again to display digital I/O states.

Password

A programmable password restricts modification of programmed settings.

Power

12-28 VDC, 5 W max

Non-Volatile Memory

All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.

Isolation

500 V

Environmental

Operating temperature range: -40 to 65°C (display inoperable < -20 °C); Storage temperature range: -40 to 85°C; Relative humidity: 0 to 90% non-condensing

Connections

Removable screw terminal blocks accept 16 to 30 AWG wire.

Enclosure

Cast aluminum with glass window, 0.30% max copper content, corrosion resistant powder coating, color: blue. NEMA 4X/IP68. Two ½" NPT threaded conduit openings. One ½" NPT stainless steel conduit plug with 10 mm hex key fitting installed.

Mounting

May be mounted directly to conduit. Two mounting holes for 1.5" pipe or wall mounting. See Mounting Dimensions on page 29 for mounting space requirements.

Signal Connector Tightening Torque

2.5 lb-in (0.28 Nm)

Shipping Dimensions

17" x 14" x 9" (43.2 cm x 35.6 cm x 22.9 cm) (L x W X H)

Shipping Weight

5 lbs. (2.27 kg)

Warranty

3 years parts & labor

Wireless Radio

Frequency

900 MHz

Range

500 ft (152.4 m) indoor, 1 mi (1.61 km) outdoor (line-of-sight)

Encryption

AES 128-bit encryption available using PDW Manager software

Interference Reduction

Frequency Hopping Spread Spectrum (FHSS)

Power Output

24 dBm (250 mW)

Sensitivity

-101 dBm

Analog Input

Inputs

Field selectable: 4-20 mA, 0-10 V, 0-5 V, 1-5 V

Accuracy

±0.03% of calibrated span ±1 count

Temperature Drift

0.005% of calibrated span/°C max from 0 to 65°C ambient,
0.01% of calibrated span/°C max from -40 to 0°C ambient

Input Impedance

Voltage ranges: greater than 110 kΩ; Current ranges: < 220 Ω

Signal Loss

Inputs will remain off (open circuit) until wireless units are reconnected.

HART Transparency

Analog input will not interfere with existing HART communications on the wired 4-20 mA signal

Isolated 4-20 mA Transmitter Output

Output Source

Analog input from connected wireless unit

Calibration

Factory calibrated: 4.000 to 20.000 = 4-20 mA output

Accuracy

± 0.1% of span ± 0.004 mA

Temperature Drift

0.4 µA/°C max from 0 to 65°C ambient, 0.8 µA/°C max from -40 to 0°C ambient

Signal Loss

mA output will become 3.2 mA after approx. 25 seconds

Output Loop Resistance

Power supply

Minimum

Maximum

24 VDC

10-ohms

900-ohms

Digital Input / Output Terminal

Channels

Four (4) digital connections, independently field selectable as either inputs or outputs

Digital Input Logic High

3 to 5Vdc, TTL logic level

Digital Input Logic Low

0 to 1.1 VDC

Digital Output Logic High

3 to 5 VDC

Digital Output Logic Low

0 to 0.4 VDC

Source Current

10 mA maximum output current

Sink Current

1.5 mA minimum input current

Signal Loss

Digital output goes to logic high

Note: A closed dry contact can be used for the digial inputs.

RS-485 Modbus® RTU Serial Communications

Compatibility

EIA-485

Connectors

Removable screw terminal connector

Max Distance

3,937' (1,200 m) max

Baud Rate

1200 – 57,600 bps

Data

8 bit (1 start bit, 1 or 2 stop bits)

Parity

Even, Odd, or None with 2 stop bits

Modbus Timeout

0.5, 1, 2, 3, 4, 5 seconds; user selectable

PDW Manager Software

System Requirements

Microsoft® Windows® XP/Vista/7/8/10

Communications

USB 2.0 (Standard USB A to Micro USB B)

Configuration

Configure devices one at a time

Connections

The diagram below below shows the locations of screw terminal blocks on the rear of the wireless field unit assembly.

Power

Power connections are made to a two-terminal connector labeled POWER. The PDW30 is reverse polarity protected; it will not be damaged if wired backwards. Make sure that the power supply can provide between 12 and 28 VDC to the wireless device.

Power PDW30 and 2-Wire Transmitter from Same Power Supply

The PDW30 wireless units may be powered from the same power supply that powers the 2-wire (loop-powered) transmitter, assuming that the supply provides enough voltage for both units. To power both devices from the same supply, wire the devices to the supply as shown below.

Signal Connector

The analog input may be either 4-20 mA, 0-10 V, 0-5 V, or 1-5 V. The appropriate input type must be programmed for each unit.

4-20 mA Output Connector

The 4-20 mA output corresponds with the analog input signal on the paired wireless device. The analog output signal is always 4-20 mA, regardless of the input type on the other wireless module.

Digital I/O Connector

All digital connections are referenced to ground. The primary unit digital I/O settings determine the settings of the secondary unit. (e.g. if DI of the primary is an input, DI of the secondary is an output)

Note: Each connection may be set independently in the device settings as either an input or an output. In the diagram to the right, D4 & D3 are digital inputs and D2 is a digital output.

PDW Manager Programming Software

Programming with PDW Manager

PDW Manager allows you to program the PDW30 wireless units from a PC with a USB connection. Units connect to a PC via the micro USB connection on their face, underneath the enclosure cover. Use of PDW Manager is required for programming advanced settings such as wireless encryption and analog signal calibration.

PDW Manager can be found on the included CD or downloaded from www.predig.com/PDWManager. Once the software is running, power the unit using a 12/28 VDC power supply and connect the device to the PC using the provided USB cable.

PDW30 wireless units connect to a PC with a USB connection

The PC will automatically install the appropriate device drivers. Once this has completed, the device will appear in the Device list at the top of the PDW Manager window. Click Connect.

Click connect button

The menu options displayed will vary depending on what type of unit is connected. The PDW30 primary unit will have more options than the secondary unit. The image below shows the available options on the configuration tab while the primary unit is connected.

Click connect button

The devices' analog inputs and outputs can be calibrated using the Calibration tabs. The IO Testing tab allows you to perform diagnostics and testing on the units.

Calibration – Analog Input

Click connect button

Calibration – 4-20mA Output

Click connect button

IO Testing

Click connect button

Device communication can be secured by enabling 128-bit AES encryption. A channel mask may also be set for interference immunity. The encryption key and channel mask may be entered on the Advanced tab.

Once you have entered the encryption information, click Save Settings. The wireless devices must share identical encryption keys in order to communicate, so be sure to enter the same information for the second unit.

Click connect button

Mounting Dimensions


Application

This simple example demonstrates how the PDW30 may be used to wirelessly bridge an analog signal. Because the PDW30 can input and output a 4-20 mA signal, it is ideal for integration into existing 4-20 mA systems.

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Why you should buy:

  • Point-to-Point Wireless Bridge
  • Rugged, Weather-Tight Housing