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INM MTL83xC PC Modbus Rev 4
Initially the request for diagnostic data from the MTL83xC system is OFF as
indicated by the green Start button and no diagnostic data (numbers) being listed.
To begin receiving diagnostic data, press the Start button. It will change to a red
color and data from the units will be received. Note that even when diagnostic data
is not being requested, it is being collected by the units any time they are powered
up (if they are rebooted the data is lost). The following shows the screen when
diagnostics are being requested and updated live:
Notice that there are several fields where non-zero information is a good thing.
These are:
Total highway packets sent A running total of the number of packets of data sent to
either MTL831C
Good packets received Tracked on each unit and is useful when comparing to Bad
or Fragment packets to see what percentage of errors
there are.
Measurements per 10 seconds This is a count of the number of measurements received
by the MTL838C from the given MTL831C. It should be
100 as the MTL838C requests measurements from both
MTL831Cs every 100ms.
The MTL831C #1 TCBO and MTL831C #2 TCBO tables are also not considered
errors. They contain resistance measurements of any Thermocouple channels.
TCBO stands for ThermoCouple Burn Out and is when a thermocouple has increased
in resistance by 50 ohms or more. The Saved value is the resistance measurement
of the thermocouple when the MTL831C was power up or rebooted, a Thermocouple
was connected to a channel configured as a thermocouple after previously being
open, or a channel was configured as a Thermocouple when previously configured
as mV or RTD. This saved value is then compared to a periodic measurement of the
thermocouple resistance (shown in the Current column). If the resistance difference
is greater than 50 ohms, then the Thermocouple status is set to “Burn-Out”. This
burnout status is also available via Modbus (not the resistance measurements). In
the example above, only one thermocouple is connected and it is on channel 2 of the
MTL831C #1. Its Saved and Current readings are both 22 ohms.
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