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Introduction
1 – 4
Advant Controller AC 31 / Issued: 01.99
3
1.3
Operation of the 40 and 50 series basic units
1.3.1 Functional
diagram
The memory of the 40 and 50 series is composed of two distinct areas:
- A RAM memory where the user program and data is loaded
- A Flash EPROM memory which contains:
- a backup of the user program with the program constants,
- the configuration data
- and the system program, which is protected against access by the user program.
A built-in battery (only in 50 series) also enables the backup of internal variables.
The system program comprises a set of universal functions designed to cover all applications
and ensure all the basic PLC functions. The user program is developed with the
907 PC331 R402 programming and test software. After being translated into instructions which
can be understood by the basic unit, the program is loaded in RUN or STOP mode into the
RAM and then saved to the Flash EPROM. This means that each time the program is loaded,
the user program saved in the Flash EPROM is copied to the RAM for processing by the mi-
croprocessor (Figure 3).
The structure of the system program memory, the user program, the inputs/outputs and inter-
nal variables are described in the appendix.
PC
CPU
RAM
At program
call-up
Program
transmission
BASIC UNIT
Isolated
RS232/485
connection
Flash
ASIC
UART
Figure 3: Functional diagram of a basic unit
Содержание 07AC91
Страница 6: ...Contents 4 Advant Controller AC 31 Issued 08 99 3 ...
Страница 58: ...Installation 4 10 Advant Controller AC 31 Issued 08 99 3 Figure 16 Relay outputs Figure 17 Transistor outputs ...
Страница 62: ...Installation 4 14 Advant Controller AC 31 Issued 08 99 3 Figure 22 Extension XK 08 F1 l ...
Страница 94: ...Programming 5 22 Advant Controller AC 31 Issued 01 99 3 ...
Страница 110: ...Communication 6 16 Advant Controller AC 31 Issued 01 99 3 ...
Страница 122: ...Appendix A 4 Advant Controller AC 31 Issued 08 99 3 ...
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