Considerations for Reducing Noise

In high noise environments, the 1746-HSCE2 inputs may accept “false” pulses, 

particularly when using low frequency input signals with slowly sloping pulse 

edges. To minimize the effects of high frequency noise on low frequency signals, 

the user can do the following:

• Identify and remove noise sources.

• Route 1746-HSCE2 input cabling away from noise sources.

• Install low pass filters on input signals. Filter values are dependent on the 

application and can be determined empirically.

• Use devices which output differential signals, like differential encoders, to 

minimize the possibility that a noise source will cause a false input.

Electronic Protection

The electronic protection of the 1746-HSCE2 has been designed to provide 

protection for the module from short-circuit and overload current conditions. The 

protection is based on a thermal cut-out principle. In the event of a short circuit or 

overload current condition on an output channel, all channels turn off within 

milliseconds after the thermal cut-out temperature has been reached.