Advant Controller 450 Product Guide
Section 2.1 General Controller Utilities
3BSE 015 953R201 Rev B 2-1
Chapter 2 Functional Description
2.1 General Controller Utilities
2.1.1 CPU
The processor module PM511V contains the total amount of RAM (Random Access Memory),
which is an 8 or 16 Mbyte dynamic RAM with error correction code. This memory holds
the system program which is in use as well as the controller system configuration and
application program, that is, all memory executed in run time. The processor module is built-up
around a microprocessor, Motorola 68040, running at 25 MHz.
The module front contains the following functions:
• Indicators and a character display for high level system diagnostics.
• The main operable equipment is a four-position rotary switch for start and working mode
selection and a restart push button.
• The module front also includes a program card interface and a connection for S100 I/O bus
communication.
• You can connect a configuration and maintenance tool on the module front.
Redundant CPU
Optional Advant Controller 450 features redundant processor modules, each containing CPU,
memory and switch over function. While the active unit is running the process control
functions, the backup unit is on “hot stand-by” and continuously updated by an automatic
check pointing procedure. A manually initiated switch-over can be accomplished. No special
arrangements are required in the application programs. If a failure is detected in the active unit,
it is halted, and the backup unit takes over totally bumpless. Status information is shown on
the module front and also sent to AdvaCommand as system alarm.
2.1.2 Memory and Backup
System Program Backup
The system program is backed up in flash PROM and loaded to the RAM in connection to
system start. Physically, the standard system program is stored in one program card (PCMCIA).
The basic system program card must always be located in the CPU. Normally the program card
should be in place during operation. The program card must be in place in order to start-up
the backup CPU of a redundant pair. Additional program cards are located in program card
interface MB510.
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