Modules for the PDW90 base station are easy to install and add functionality to the wireless system. There are four types of modules available: dual analog inputs, dual analog outputs, digital I/O, and dual relays. The analog outputs module allows the base station to output two independent analog signals being broadcast by any of the field units. The analog inputs module allows the base station to accept two analog signals and transmit them wirelessly to any of the connected field units. The digital I/O module contains four channels which can be programmed to correspond with any of the field units’ digital inputs or outputs. The dual relays module can also be controlled from any of the connected field units’ digital I/O.
- Easy to Install
- Adds Functionality to the PDW90 Wireless System
- Can Utilize up to 16 Modules in PDW90 Base Station
- Dual Analog Inputs Module
- Dual Analog Outputs Module
- Digital I/O Module
- Dual Relays Module
Dual Analog Input Module
Field selectable: 4-20 mA, 0-10 V, 0-5 V, 1-5 V
±0.03% of calibrated span ±1 count
All ranges are calibrated at the factory. Recalibration is recommended at least every 12 months.
0.005% of calibrated span/°C max from 0 to 65°C ambient,
Voltage ranges: greater than 110 kΩ; Current ranges: < 220 Ω
Inputs will remain off (open circuit) until wireless units are reconnected.
Analog input will not interfere with existing HART communications on the wired 4-20 mA signal
Dual 4-20 mA Output Module
Analog input from connected wireless unit
Factory calibrated: 4.000 to 20.000 = 4-20 mA output
± 0.1% of span ± 0.004 mA
0.4 µA/°C max from 0 to 65°C ambient,
Loop Power Supply
Internally powered; no external supply needed
Output Loop Resistance
After approximately 25 seconds of trying to reconnect, mA output will become 3.2 mA
Digital Input / Output Module
Four (4) digital connections, independently field selectable as either inputs or outputs
Digital Input Logic High
3 to 5 VDC
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
10 mA maximum output current
1.5 mA minimum input current
Digital output goes to logic high
Dual Relays Module
2 SPDT (Form C); rated 3 A @ 30 VDC and 125/250 VAC resistive load; 1/14 HP (≈ 50 W) @ 125/250 VAC for inductive loads
Noise suppression is recommended for each relay contact switching inductive loads; see page 13 for details.
After power failure, relays will initialize to default state before reconnecting to wireless units.
If mapped to digital input channel, the relay energizes.
The diagram below shows the locations of screw terminal blocks on a fully loaded PDW90 base station electronics board. This diagram shows the board loaded with four relay modules, four digital I/O modules, four analog input modules, and four analog output modules. Actual module locations may differ.