Rockwell Automation 1771-QB Linear Pos. - Manual (Page 70)

Interpreting ModuleĆtoĆPLC Data
(READS)
Chapter 6
6Ć9
Bit 13 – Feedback Fault
The feedback fault bit turns on when the module detects a fault in the transducer
interface circuitry. In this event, the module also activates OUTPUT 2 if
configured as the loop fault output. The following conditions will cause a
feedback fault:
loss of transducer power
internal loop-back fault
excessive change in velocity
loss of feedback
position exceeds maximum transducer length
Bit 14 – Analog Fault
The analog fault bit turns on when the module detects a fault in the analog
circuitry. In this event, the module also activates OUTPUT 2 if configured as
the loop fault output. The following conditions will cause an analog fault:
loss of analog power
analog power supply voltage out of tolerance
analog circuitry fault
Bit 15 – Internal Fault
The internal fault bit turns on if the module detects a fault in the circuitry
powered by the backplane. In this event, the module also activates OUTPUT 2
if configured as the loop fault output. If this fault occurs, return the module to
your Allen-Bradley representative.
Position/Error/Diagnostic Words
You can use these words to display diagnostic information, current axis
position, or the following error. You select the information to be displayed
through bits in the command block. You can also view all three parameters
simultaneously by specifying diagnostics for words 4, 5 and 8, 9; position
information for words 12, 13 and 14, 15; and following error for words 16, 17
and 18, 19. These selections use the extended status information. See Chapter 7
for details on the command block.