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C4 Manual Rev 7.5.2
Explicit Program End
If you are observing behavior that indicates that the controller is continuing to
control beyond the end of the steps you have in your program, check to be certain
that you have a step at the end of your program that points to step 100 to end the
process. Otherwise, if there are some unused steps further up in program
memory, they may be getting executed in error. Be sure that any unused steps
that are in the middle of your program have been changed to null steps (ramp and
hold time both = 0).
Blowers Misbehaving
If the blowers seem to behave differently than you expect, check the Blower
Shutoff Mode setup parameter (F15).
Program hangs on Ramp as Quickly as Possible step
Note that a program step with specified ramp and hold times will terminate at the
end of the specified time (ramp time + hold time), regardless of whether the
controller was able to achieve the setpoint. On the other hand, a maximum speed
ramp step (substep 1 = 00.00 & substep 2 = 99.00) will not advance to the next
step until and unless the setpoint is achieved. If the unit under test generates or
absorbs heat in a manner that prevents the test environment from ever becoming
stable at the setpoint, the program will “hang” on such a step as it will not
advance to the next step unless it can stabilize the platform or chamber at the
setpoint.
9.7.7 Diagnosing and Solving Remote Mode Problems
General Considerations & CC-3 Compatibility
Bus communication problems often involve command syntax errors. The Sigma
C4 is NOT case sensitive. The command “GT” is satisfied by “Gt”, “gT”, or “gt”.
Each command line should be properly terminated with both a CR (ODh) and LF
(10h), but the C4 can fix the problem if one of the termination characters is
present. The C4 fixes up extra spaces, tabs, and commas. The C4 ignores EOI.
The model CC-3 controller does not have a fault tolerant parser. If programs that
use only CC-3 compatible commands run properly on the C4, but not on the CC-3,
the problem is likely a command syntax problem that the C4's fault tolerant
parser corrects.