Preliminary User Manual UMAX023241 - Version: 1.1 18-63
microprocessor over-temperature reading disables all the outputs until it has cooled back to the
operating range.
Fault detection is available for current output types. A current feedback signal is measured and
compared to desired output current value.
The outputs are inherently protected against a short to GND or Vps by hardware. In case of a dead
short, the hardware will automatically disable the output drive, regardless of what the processor is
commanding for the output. When this happens, the processor detects output hardware shutdown
and commands off the output in question. It will continue to drive non-shorted outputs normally and
periodically try to re-engage the short load, if still commanded to do so. If the fault has gone away
since the last time the output was engaged while shorted, the controller will automatically resume
normal operation.
In the case of an open circuit, there will be no interruption of the control for any of the outputs. The
processor will continue to attempt to drive the open load.
The measured current through the load is available to be broadcasted on a CAN message if desired.
It is also used as the input to the diagnostic function block for each output, and an open or shorted
output can be broadcasted in a DM1 message on the CAN network
1.6.
Lookup Table Function Block
Figure 9: Lookup Table Block objects
Lookup Tables are used to give an output response of up to 10 slopes per Lookup Table. There are
two types of Lookup Table response based on
X-Axis Type
:
Data Response
and
Time Response
Sections 1.6.1 through 1.6.5 will describe these two
X-Axis Types
in more detail.
There are two key setpoints that will affect this function block. The first is the
X-Axis Source
and
X-
Axis Number
which together define the Control Source for the function block.
