Opto 22's Product Support Group (PSG) develops some helpful tips as they work with customers calling in for free product support. Here are some hardware tips from Product Support engineers.
Low-voltage AC Inputs
Do you need a low-voltage AC input? You can use a module like the SNAP-IDC5 for a 10 to 32 VAC input, or use the SNAP-IDC5G for inputs from 35 to 75 VAC. Because these modules incorporate a full-bridge rectifier, they can work with either an AC or a DC input. Loop Sourcing and Isolation: a Great Combination "I always like to tell customers about our isolated sourcing modules," says Bill Steffens, PSG Lead Engineer. "They're practically indestructible!"
Each module has two channels isolated from each other (each module also includes transformer and optical isolation). You just bring 24 volts of loop sourcing power to the top of the module, and it provides isolated loop sourcing power to both channels.
The modules' design gives them two key advantages: first, they eliminate ground loop problems, and second, any short on the field wiring is limited by the isolated loop supply so it won't damage the module. That's where the indestructibility comes in.
For those of you familiar with G4 modules, these SNAP modules function just like the G4AD3 and the G4DA3—except that each has two channels instead of just one.
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