5.10.1 Verify alarm output
To verify the alarm output, use Rosemount Radar Master to simulate a device failure:
Procedure
1. Establish HART communication with the transmitter through Rosemount Radar
Master.
2. Select Tools → Simulation Mode.
3. Select Enable Device Failure Alarm (simulated).
4. Select Start.
5. Disconnect HART modem.
6. Verify that the configured alarm output is available in the Modbus host.
7. Use Rosemount Radar Master to turn off simulation mode.
5.10.2
Use status information to evaluate measurement
validity
The transmitter updates status information about the current measurement, and this
status information is available as a bitfield register through Modbus communication.
By monitoring the status information it is possible to determine if the current
measurement output value is valid. See Common Modbus host configuration for details
about the individual status bits.
5.10.3
Use Heartbeat to detect errors
By reading and evaluating the Heartbeat value from the device, it is possible to verify that
the communication link between the transmitter, HMC, RTU and even the control system
communicating with the RTU is working.
Assign Heartbeat to one of the transmitter variables (SV, TV, or QV). Heartbeat is
increased by one for each measurement cycle in the device (until it eventually starts over
at zero again).
In case this value is not updated, it means that the communication link is broken.
Reference Manual Configuration
00809-0100-4530 April 2019
Reference Manual 155
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