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C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C622-01
1.1 Controlling with the C7
The user program runs on the C7 CPU. This controls the process to be
visualized by the operator control and monitoring components of the C7.
The way in which the C7 CPU operates is determined by the following
components:
Program Memory
This contains the user program
Processor
The processor executes the program cyclically:
S At the beginning of the cycle, the processor reads the signal states of all
inputs and creates the process image input table (PII)
S The program is executed step-by-step while referencing internal counters,
memory bits and timers.
S The processor stores the calculated signal states in the process image
output table (PIQ). The signal states are then transferred to the outputs.
The C7 CPU is independent of the C7 OP. The C7 CPU has its own MPI
address and is connected to the C7 OP via the MPI interface.
At present, there are three standard programming languages available for
programming the C7 CPU:
S STL: A statement list consists of a series of statements. Each statement in
your program contains instructions in the form of mnemonics which
represent a function for the C7 CPU to perform.
S LAD: A ladder diagram is a graphical program language that resembles
electrical circuit diagrams.
S FBD: A function block diagram is a graphical programming language
representing the logic in logic boxes familiar from Boolean algebra.
Other optional programming languages include SCL and HiGraph.
The tool you use to create user programs is STEP 7. The user manual /231/
contains all the instructions for programming. When programming in a
specific language, use the manual listed in the preface of /231/.
STEP 7 runs on a programming device or PC. You can operate these devices
independent of the C7. You generally only connect the programming device
or PC to the C7 via the MPI interface when you want to download your user
program to the C7 CPU.
Overview
C7 CPU
Programming
Languages
Programming
Software
Devices
Introduction
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