Why does Lookout receive wrong count from FP-CTR-500

Counter module flashes light count = to field pulse input device. Lookout fieldpoint object follows device count, but occassionally double counts giving wrong results. Is this a hardware problem with the counter module? A second counter in the system works as expected. Both are wired the same way and read the same way in the software and are receiving signals from like field devices.

Mike,
To rule out the possibility of this being a hardware problem in the FP-CTR-500 module, you can swap both of your FP-CTR-500 modules. I suspect that the problem will remain on the same signal/channel indicating that it is most likely a signal problem.
You may be receiving a double count as a result of noise or signal differences in the sensors wired to the various channels. To reduce the likelihood of a spurious signal causing a double count, you can enable the low pass filter on the FP-CTR-500 to reject signals above 200 Hz. If you look at the signal on a scope, you may see that it is fairly noisy and could use some filtering. Also, consider if one sensor has a longer cable run then the other or if it routes near something that may be electricall
y noisy.
Regards,
Aaron

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