UMAX180800, 20 Thermocouple, 2 RTD, 4 Inputs, 6 Relays Dual CAN Controller
Version 1
Page: 31-71
Please note, that the
“Supply Voltage” signal does not present the voltage on the controller
power supply connector pins. It shows an internal voltage measured after the EMI filter,
reverse polarity, and transient protection circuit. The reading accuracy is within the ranges of
1V.
The
Global Parameters
function block has the following configuration parameters.
Table 29. Global Parameters Function Block Configuration Parameters
Name
Default Value
Range
Units Description
Global Continuous
Constant Signal
0
Any value
–
Signal value of the
Global
Continuous Constant Signal.
Global Discrete
Constant Signal
0
0… 4294967295
(0xFFFFFFFF)
–
Signal value of the
Global Discrete
Constant Signal.
3.13 Miscellaneous
The Miscellaneous function block contains various parameters that affect the general
diagnostic performance of the ECU.
The
Undervoltage Threshold
,
Overvoltage Threshold
, and
Shutdown Temperature
setpoints are used to set the limits for when their respective diagnostic messages are
triggered.
Lastly, the
CAN Diagnostic Setting1
and
CAN Diagnostic Setting2
parameters are used to
control all diagnostics with one general setting for CAN Interface 1 and CAN Interface 2
respectively. This can be used to disable diagnostics entirely, only transmit messages without
a blank SPN, or transmit diagnostic messages normally.
3.14 Diagnostics
The Diagnostic function block includes 120 faults, each representing a diagnostic message
that the ECU is able to produce. Each Universal Input has a Voltage Out of Range Low and
Voltage Out of Range High Faut. Each RTD has Temperature Out of Range Low and
Temperature Out of Range High, High and Low Shutdown Faults. Each Thermocouple Input
has Temperature Out of Range Low and Temperature Out of Range High, High and Low
Shutdown, and Open Circuit Faults. The remaining faults cover VPS Overvoltage and
Undervoltage, Overtemperature, and other faults.
If and only if the
Event Generates a DTC in DM1
parameter is set to true will the other
setpoints in the function block be enabled. They are all related to the data that is sent to the
J1939 network as part of the DM1 message, Active Diagnostic Trouble Codes.
A Diagnostic Trouble Code (DTC) is defined by the J1939 standard as a 4-byte value which is a
combination of:
SPN
Suspect Parameter Number
(first 19 bits of the DTC, LSB first)
FMI
Failure Mode Identifier
(next 5 bits of the DTC)
CM
Conversion Method
(1 bit, always set to 0)
