The Precision Digital PDW30 gives you a simple, straightforward way to get an analogue, 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.
The diagram below shows the locations of screw terminal blocks on the rear of the wireless field unit assembly.
Power connections are made to a two-terminal connector labelled 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.
The analogue 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.
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.
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.
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
Calibration – 4-20mA Output
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.
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.