Graco PrecisionFlo XL Instructions Manual page 104

Theory of Operation
Fault On Data Output
The data outputs represent binary values. To determine the fault, add the data together and compare it against
Table 43—Fault Codes, page 92.
Example 1:
Output ON:
State
Total Volume = 1 + 4 +16 = 21, which represents a "Op Cable 2 Open" fault.
Typical Fault Reporting Procedure
1. A problem occurs in the PrecisionFlo XL control.
2. The PrecisionFlo XL control analyzes the problem
indication and determines if the fault is an alarm or
a warning.
3. If the fault is an alarm:
a. PrecisionFlo XL control sets the DISPENSER
READY signal LOW.
b. PrecisionFlo XL control places the fault code
on the data bus and sets the FAULT ON DATA
signal HIGH.
The robot can detect the fault strobe signal and
read the fault data immediately or at the end of the
cycle (see steps 4 and 5).
If the fault is a Warning, normal operation contin-
ues to the end of the cycle. A Warning should be
cleared using the TouchScreen or FAULT RESET.
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Output OFF:
4. On completion of the cycle, if volume information
is requested, the PrecisionFlo XL control uses the
data bus to transfer the volume data. (See Fig-
ure 75, Volume Reporting on page 105.) During
volume transfer, the FAULT ON DATA signal is
LOW.
5. When the cycle is completed and any volume
information has been transferred, the PrecisionFlo
XL control places the fault code on the data bus
and FAULT ON DATA changes to HIGH.