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Programming
Page 5-4
ABB Control - AC 31
1SBC 260400 R1001-b
06.99
2. List of variables
There are 5 types of variables used in the user program:
The physical, binary or analog, Input / Output variables
The internal bit, word or double word variables used in the user program for the
intermediate calculations.
The indirect bit, word or double word constants.
The chain steps: a chain step enables running sequential operations. Each chain step
enables the definition of a step. One single step may be active at a time.
The historical values: certain functions require the execution of numerous program cycles
in order to execute. A historical value is an internal register used by this type of function to
store the result, of the function, in the program cycle n-1 during the functions process.
The historical values are not directly accessible, in the user program, with the 40 and 50 series
central units.
Comments on the historical values:
The maximum number of historical values allowed in a project is 256.
A list of the functions and their historical values is available in the annex.
The historical values of the timer functions are independent from the list of historical values of
the other functions. The number of authorized timer functions is unlimited, however the
number of simultaneous timer functions is limited to 42.
Содержание AC 31
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Страница 110: ...AC 31 technical documentation ABB Control AC 31 Page 5 1 1SBC 260400 R1001 b 06 99 Chapter 5 Programming ...
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Страница 141: ...Programming Page 5 32 ABB Control AC 31 1SBC 260400 R1001 b 06 99 Figure 5 10 Duplicating inputs of a function block ...
Страница 154: ...AC 31 technical documentation ABB Control AC 31 Page 6 1 1SBC 260400 R1001 b 06 99 Chapter 6 Program Optimization ...
Страница 172: ...AC 31 technical documentation ABB Control AC 31 Page 7 1 1SBC 260400 R1001 b 06 99 Chapter 7 Communication ...
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Страница 190: ...AC 31 technical documentation ABB Control AC 31 Page 8 1 1SBC 260400 R1001 b 06 99 Chapter 8 Diagnosis ...
Страница 191: ...Diagnosis Page 8 2 ABB Control AC 31 1SBC 260400 R1001 b 06 99 Figure 8 1 Error detection LEDs ...
Страница 195: ...Diagnosis Page 8 6 ABB Control AC 31 1SBC 260400 R1001 b 06 99 Figure 8 2 AC31GRAF status window ...
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Страница 218: ...AC 31 technical documentation ABB Control AC 31 Index Page 1 1SBC 260400 R1001 b 06 99 Index ...