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931-AT001
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Catalog excerpts

931-AT001 - 1

Complete Your Architecture Application Technique I/O Problems Got You Down? How to Prevent Ground Loops in I/O Wiring with Signal Isolation Customer Need Panel builders and design engineers often default to non-isolated PLC/DCS I/O cards to save on overall I/O costs. This strategy is competitive in bidding against other alternatives; however, it can lead to problems at the commissioning stage or later. For example, there is a greater risk of ground loops due to common power supply connection (potential) at the I/O card and different ground potentials at the end devices/sensors in the I/O circuits. Ground loop effects corrupt sensor data en route to the I/O card, resulting in errant readings and requiring additional time and resources for troubleshooting. Non-Isolated PLC I/O Card Risk of Ground Loop Interference, Up-front Cost Savings Ground Loop Isolated PLC I/O Card Eliminates Ground Loop Interference, Costly Solution

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931-AT001 - 2

Component Solution Consider using 931H Isolators (where appropriate) to add isolation to I/O circuits. Panel designers may only need to provide galvanic isolation for select circuits, because not all I/O circuits need to be isolated. This solution enables a more flexible and cost-effective panel design. Non-Isolated PLC I/O Card with 931H Signal Isolator Eliminates Ground Loop Interference, Cost-effective Solution 931H-A1A1N-IP: $169 Summary 931H High-Density Signal Conditioners provide a cost-effective solution for circuits at risk of ground loop interference. They also provide the...

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