Heartbeat And Health Check - Novatech Bitronics M660 User Manual

6.12 Heartbeat and Health Check

M66x provide a Heartbeat State Counter Register that allows the user to determine
the time between successive polls. This counter will increment by the number of
milliseconds that have elapsed since the last time the data was updated. Another use
of this register is as a visual indicator that the data is changing; it allows users of
certain MMIs to identify disruption in the polling of the instrument. The Heartbeat
State Counter is a full 32-bit counter that rolls over at 4,294,967,295 (4,294,967
seconds). The counter starts at zero on power-up, and is NOT stored in non-volatile
memory.
M66x have several self-tests built in to ensure that the instrument is performing
accurately. The results of these self-tests are available in the Health Check register
which is a simple 16-bit binary value. Each bit represents the results of a particular
self-test, with "0" indicating the test was passed, and "1" indicating the test was failed.
If Health status failures occur, the meter may have experienced an operational failure.
The table below provides a reference of error codes. The Health Check value shown
in the M66x web live data page is a hexadecimal representation of the binary value.
For example, a Health Check value of 0000 0014 is the equivalent of the binary value
000000000010100. The "1" shown in bit 2 and bit 4 represents a failed test in those
bits which indicates a checksum error for both the gain and phase on the calibration.
Contact the factory for further instructions.
Health Check Error Codes
Bit Description
0 Checksum error on analog output (either 0-1mA or 4-20mA) calibration
constants (Note: NOT APPLICABLE IN M66x only M65x)
2 Checksum error on gain calibration of inputs
4 Checksum error on phase calibration of inputs
12 Indicates firmware download in progress and measurements are offline
ML0042 October 15, 2019
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