B.4 Error and Warning Descriptions Appendix B: Error, Warning and Information Messages
242 493-0736-11 (6-2)
Sample Time Error
If the time it takes to complete a full cycle of processing is greater than the Sample
Time configured, this error is set.
The Sample Time is automatically increased so that the system can complete a full
cycle of processing without errors.
It is advisable to tune the controller (using the Autotuner) after an occurrence of
this error as an adjustment of the Sample Time affects loop dynamics.
AIx Int/AOx Int
All Analog Inputs and Outputs can be configured to cause either a Warning or an
Error when the connection is broken. If a warning is configured, a message is
displayed according to the general procedure. If an Error is configured, the
message is displayed and the Loop that is using the I/O takes action as defined by
the parameter ErrorBehavior.
If an analog input or analog output configured for 4–20 mA (or 1–5 V, or
1–10 V) detects a current (or voltage) less than 2 mA (or 0.5 V, or 1.0 V), this is
indicated as a warning or error. The analog output reacts at once, while the analog
input reacts after five seconds.
If the signal wires of an analog input are connected with reverse polarity, a ”Sys
Err HW” error is set. For actions, refer to section B.4.1.
DO Overload
If the Digital Outputs are overloaded all Digital Outputs are shut and this error is
set. When the user acknowledges this error, the Digital Outputs return to their
normal function.
If the function of the digital outputs does not return to normal after
acknowledgement, turn off the power, let the unit cool off for a few minutes, and
then turn on the power again.
Calibration
If a Checksum Error is found in the Calibration factors, this error is set. The
Calibration factors are used to produce accurate values from the Analog Inputs
and to the Analog Outputs. If this condition is valid, an alternate set of factors is
used, resulting in reduced accuracy for Analog I/O.
To Next Page
Loading...
