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KB52179
Reference to a PID by another PID may cause an ‘Undefined command’ error in ioControl
Revision:  1.0
Published:  6/19/2006
Applies To
ioControl Professional
ioControl Basic
Versions
Problem was discovered in version:  
R7.1d

SYMPTOMS

An ioControl strategy with two PIDs that reference each other may cause an ‘Undefined command’ error when the strategy is downloaded.

CAUSE

The order in which the PID loops are defined by ioControl, and the order in which the PIDs reference each other, causes the download error. The PID loop that is referenced by another PID is not configured/compiled before the PID that references it is compiled.

For example, in a strategy, there are two PID loops named Reheat_2_Inner_Loop and Reheat_2_Outer_Loop. Reheat_2_Inner_Loop references Reheat_2_Outer_Loop. The ioControl compiler will compile Reheat_2_Inner_Loop first (it alphabetically is identified first).

WORKAROUND

Rename the PID loops so that the PID loop that is referenced by another is compiled first.

In the above example, renaming the loops in the following manner will work around the problem:

Reheat_2_Inner_Loop
to:
Reheat_2_Z_Inner_Loop

Or

Reheat_2_Outer_Loop
to:
A_Reheat_2_Outer_Loop

RESOLUTION

Opto 22 is researching this issue.

Relevant Downloads
No relevant downloads have been specified.
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