1757-FFLD2 A-B Analog Input Module
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Because of the potentially high current surges that occur when switching inductive load devices, such as motor starters and solenoids, we recommend the use of some type of surge suppression to protect and extend the operating life of the controllers output contacts. Switching inductive loads without surge suppression can significantly reduce the life expectancy of relay contacts. By adding a suppression device directly across the coil of an inductive device, you prolong the life of the output or relay contacts. You also reduce the effects of voltage transients and electrical noise from radiating into adjacent systems. Refer to the Micro820 Programmable Controllers User Manual, publication 2080-UM005, for suitable surge suppression methods and recommended surge suppressors.
Inputs on analog channels employ digital high-frequency filters that significantly reduce the effects of electrical noise on input signals. However, because of the variety of applications and environments where analog controllers are installed and operated, it is impossible to ensure that all environmental noise will be removed by filters. Several specific steps can be taken to help reduce the effects of environmental noise on analog signals: • Install the Micro800 system in a properly rated (NEMA/IP) enclosure. Make sure that the Micro800 system is properly grounded. • Use Belden cable #8761 for wiring the analog channels, making sure that the drain wire and foil shield are properly earth grounded, (see Grounding Your Analog Cable on page 13 for more information). • Route the Belden cable separately from any AC wiring. Additional noise immunity can be obtained by routing the cables in grounded conduit.
The structure and details of the product：
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