Programmable Logic Controller (PLC)

PLCExpress^TM is a powerful and robust line of SCADA PLCs with outstanding capabilities for handling even the most demanding control situations. Use as a stand-alone PLC or network with a central PC for professional quality HMI graphics, data logging, remote control and more.

Two models, Gold and Platinum, provide economical solutions for small and large PLC applications. And, a host of powerful PC/Windows features when networked using Millennia-DX or FT software and telemetry enable the integrated system to manage and document your overall operations. Add a 24VDC power supply, download instructions from your laptop PC and you’re ready to go as a stand-alone PLC. Or, connect with a central PC and start logging data and controlling a network up to 252 PLCs throughout your plan.

Both models have eight 4-20ma (12-bit res) analog inputs for monitoring a variety of 4-20ma sensors. The cards also have digital inputs for monitoring dry contact NO/NC switches. And, there are 4-20ma (12-bit res) analog outputs that can control a 4-20ma variable speed drive or actuator using a PID-loop control strategy to maintain a set point around any analog input. Controllable SPDT relay outputs with 120VAC/.3A contacts complete the I/O complement. A 4-line x 20 character LCD shows the status of analog inputs and controls. All of the essential PLC signal processing and process control capabilities are contained within this package. Boolean logic control setup and math functions are standard. An on-board clock/ calendar module provides accurate timing links.

GOLD — The Gold model, Catalog DX8884 Has eight analog outputs, one for each analog input, enabling as many as eight PID control loops to operate simultaneously around any or all of the eight analog sensors. The extra analog outputs can also accommodate up to eight AGSC (automatic gas sensor calibration) circuits, providing a huge cost savings over manual calibration.

The Gold Model comprises two interconnected PCBs. The “A” module contains the processor, memory and display, while the “B” module houses the I/O. The functions are separated to permit future plug-in enhancements of the I/O count and mix without changing the programmable CPU section.

Setting up and downloading your SCADA instructions to any of PLCExpress models is via the software supplied, which runs on your laptop PC under Windows operating system. The cable supplied easily connects the serial port on your laptop to the serial port on the PLC. Just fill in the setup data on the screen provided and click on the download command.

Platinum — The Platinum model, DX8F44 (F) has similar capabilities of the Gold model plus 16 additional configurable I/O and control features, but only 4-analog outputs. Both the Gold and Platinum can communicate with Rel-Tek’s telemetry cards (DX-1000, DX-2202) expanding its capabilities.