AC31 mit AC1131 Teil 16: Systemtechnik Serie 40/50

Introduction

The programming and testing software 907 AC 1131 is a complete development environment for the ABB Advant Controller system of 90 (S90) and 40..50 (S40..50) series. The main difference between PLCs of the 90 series and the 40..50 series is the operating system. In the 90 series, the 907 AC 1131 programming system and the multi-tasking run-time system belong inseparably together. When compiling a project, processor code is generated for the 90 series. The basic units of the 40..50 series still work with the EBS operating system. With the 40..50 series, the project projekt.pro is translated into the IL code of the EBS operating system. It is possible, to look at the translated code by opening the ASCII files projekt.cod or projekt.adr. The code contained inside them is sent to the PLC. In this part of the documentation the system technology for the 40 and 50 series is described. In the file "Peculiarities_e.pdf" (Volume 8 of the documentation), the main differences and restrictions are described from the point of view of the 907 AC 1131 programming system.

Operands of the basic units S40..50

The peculiarities of the operands of the 40..50 series basic units are described in the file Peculiarities_e.pdf under "2.2 Variables of S40..50". There are 5 types of variables 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.

Symbol AT address : Type [:= initialization value]; (* comment *)

Note:: With the software 907 AC 1131, Importfiles *.exp are automatically installed in the Library subdirectory. In this Importfiles important operands are already declared. (see chapters Inputs, Outputs, System constants, system flags).