32 Rockwell Automation Publication 1734-UM013J-EN-P - July 2014
Chapter 2 Safety Inputs, Safety Outputs, and Safety Data
Digital Input Filter
A single-pole, anti-aliasing filter of 10Hz is followed by a four-pole digital filter.
Choose from the following available corner frequencies.
• 1 Hz
• 5 Hz
• 10 Hz
• 50 Hz
The default input filter setting is 1Hz.
Figure 12 - Filter Operation
The filter setting affects the module’s step response. See the technical
specifications for the 1734-IE4S module, beginning on page 164
.
For the analog input modes, the input filter settings set the low-pass filter to filter
out noise that may be present on the signal. In Tachometer mode, the input filter
removes noise that may be present on the calculated frequency, effectively
changing how rapidly the tachometer frequency changes to provide a value with
less jitter.
Sensor Power Supply
You can configure the module to supply power to the connected sensors, or you
can supply power to the sensors from an external power supply. To comply with
UL restrictions, field power and connected devices must be powered by a single,
Class 2-complaint power supply.
We recommend that you configure the module to supply power to the sensors
because this lets the module detect if a sensor loses power, if the sensor is drawing
too much power, or if there is a short in the power wiring to the sensor.
At powerup or after a reconfiguration, each sensor power supply is tested by
being turned on for 500 ms.
Configurable Digital Filter Settings
N = 1 Hz, 5 Hz, 10 Hz, or 50 Hz
Anti-alias Filter
10 Hz
1 pole 1 pole 1 pole 1 pole 1 pole
NNNN
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