OSA Remote Operation
Chapter 2
10/11/18
Bedrock Secure OSA Remote User Manual - BRDOC020_001
15
Analog Accuracy
Specifications
See Table C-3 for information on the following OSA Remote analog accuracy
specifications:
•
analog input accuracy for 4-20 mA inputs
•
analog input accuracy for 10 V inputs (0-10 V)
•
analog output accuracy
•
temperature coefficient
HART Revision 7
The OSA Remote can communicate to smart field devices using the HART
Communication Protocol. The module is a HART master device and supports
HART Revision 7 software. See the “HART Device Configuration” chapter for
information on configuration of HART devices with OSA Remotes.
Discrete Output Switches
The output switch consists of a high-powered MOSFET capable of switching up
to 1 amp at 30 V DC.
Electronic Fusing
When configured for discrete output, a channel can utilize an electronic fuse that
will disable the channel if the current exceeds a programmable threshold up to
1 amp. Each channel’s electronic fuse can be configured to latch off or auto retry
during an overcurrent condition. When the channel has been latched off, the
channel must be disabled (turned off) to clear the fault condition. Channel faults
can be detected in the Bedrock IDE by checking bit 4 of the Input Analog Status
mapped variable for a channel. See Table 4-7 and Table 4-8 for information on
mapped variables and status bit definitions.
Discrete Outputs
When an OSA Remote channel is configured to operate as a discrete output, the
discrete output can be externally sourced or internally sourced. Internally
sourced discrete outputs are ideal for driving solid state relays. A circuit diagram
for an externally sourced discrete output is shown in Figure 2-3. A circuit
diagram for an internally sourced discrete output is shown in Figure 2-4.
