OSA Remote Operation
Chapter 2
10/11/18
Bedrock Secure OSA Remote User Manual - BRDOC020_001
17
Recommended Practices
The following are recommended practices for use of the OSA Remote:
•
External fusing is recommended for all discrete outputs.
•
External surge protection is required across the load for inductive loads
greater than 60 mH. A suppression circuit for DC loads is shown in
Figure 2-5.
Figure 2-5 OSA Remote Diode Suppression Circuit with DC Load
Frequency Measurement /
Pulse Accumulation
Each discrete input channel is configurable for discrete on/off detection or the
channel can be used for frequency measurement from 10 Hz to 100 kHz. Each
channel can also be used for pulse accumulation. Up to 4 billion pulses can be
captured. Pulses are captured on falling edges.
NAMUR
An OSA Remote can be configured to interface to a NAMUR output sensor.
The NAMUR sensor will provide a low-level current to the OSA Remote which
will use the current level to determine if the signal represents an on or off
condition or a sensor failure. NAMUR sensors are typically used in hazardous
environments. See Table C-8 for NAMUR specifications. Use the Mode
parameter in the Bedrock IDE to configure the OSA Remote for NAMUR.