Heavy Industry Applications
Chemicals Manufacturing
In a major chemicals manufacturer, three Modicon 984's were connected via Data-Linc MDL500 Remote modems to an MDL500 Master which is connected to a Honeywell HPM. The communications is RS-232 Modbus RTU, operating at 9600 baud with the data superimposed on instrumentation cable.
Shipbuilding frame crane
 Data-Linc wireless Ethernet modems provide reliable, cost-effective data communication for a large shipbuilding application. Data needed to be transferred between two central monitoring/control stations and the new-concept HSLT (Hydraulic Synchronizing Lifting Technique) frame crane designed to handle oversized components. Engineers in China installed four wireless Ethernet modems to communicate between the HSLT crane and central control in two point-to-point systems.
The greatest challenge was to send and receive data in spite of two types of high noise interference:
- The electric sparking produced by high voltage power supply, motors and welding machines
- The interference that results when RF transmissions occur through multiple paths in close proximity
In addition to overcoming the inherent and imposed interference, the installation required error-free continuous operation 24 hours a day for five successive days at a time. Only the highest performance with superior reliability in data communication devices could be considered. Two GE Fanuc 90-70 PLCs, housed on the HSLT crane, were each connected to an SRM Ethernet radio modem (using directional antennas) with data communication occurring via two additional wireless Ethernet modems (using only simple whip antennas) linked to two monitor/control stations.
For this wireless installation, Data-Linc's Smart SpectrumTM technology modems were the top choice because of their cost-effective, proven reliability in the harshest industrial environments. Because Data-Linc modems have an RF frequency offset function and are factory configured, the devices were easy to install and are not only communicating flawlessly despite the high noise environment, but are also operating side-by-side without interfering with each other. (See diagram for this application. Read background information about the HSLT technology)
Tramco
Tramco, a Boeing Company subcontractor, is using Data-Linc LCM100s to transmit multiplexed contact closure data for hangar door lockout system over 480VAC power lines across rolling wheels (sparking source).
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