Instruction Manual

Table Of Contents

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Issue 4 Nov 08 AN-T80009 25

In the example above, there are two function block instances, shown by the arrows. The FZesd10712

instance (TOF) is only distinguishable by the parameters it receives in the following brackets.

The code above was generated using Toolset build 111. Note that the FZesd10712 code nests the

AND gate inside the input parameters. Earlier Toolsets did not nest logic; they would create a

temporary variable as the result of the AND gate, and then send that to the FZesd10712 instance.

If power flow debugging was enabled, then the AND gate result would be written to a temporary

variable, that temporary variable would then be written to another temporary variable, and finally the

FZ10712 instance would receive the second temporary variable.

The IOU manager has to interpret this code and decide which instance in the old logic matches the

instance in the new logic. The ‘FZesd10712’ name may have changed, and the names of the

temporary variables may also have changed.

If the Power Flow Debugging setting has changed since the previous compilation, then temporary

variables and code will have been added or deleted. The Power Flow Debugging option applies

globally to all programs but only takes effect if the program is compiled. If the dictionary is changed,

then all programs are compiled. It is possible for some programs to be compiled with power flow

debugging and some without, if the compiled code is not first deleted by the ‘Touch’ menu option.

This is clearly a source of confusion to the IOU manager.

It is possible to set the Power Flow option as it was on the previous PC, but then leave the program

unsaved. The program code is unchanged, and the next IOU will see no change. However, if other

programs were last compiled with the opposite Power Flow option, these will be affected by the

change.

The solution is to upgrade the Toolset to release 3.5.1. This creates more rational code and the IOU

manager is adapted to determine the true source of the inputs of a function block, so it is not affected

by power flow debugging options.

FZesd10712 ( ( PR_IPS & CCR_FRE_HOLD_X & PSDLL_224_X ) , T#320s ) ;

O_ESD1_ESD1_1 := ( Catastrophe_CP & _FZesd10712.Q ) ;

TA_4 := TMR_SEC ( _FZesd10712.ET , T#320s ) ;