ABB AC 800F Engineering Manual page 26

Process Station
Max. no.
of objects
Configuration
date (PRAM)
Configured
redundancy memory Memory size in Kbytes that is reserved for the transfer of redundancy data.
Max. redundancy
memory required
Tasks
Network buffer
Interface
objects
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The RAM memory is divided into sections ::
• object directory
• PRAM
• redundancy memory
• object data
• communication management
The memory for the objects, memory for PRAM and, if available, memory
for redundancy can be adjusted in the boot parameters of the resource.
Any surplus memory is made available in RAM. There is no absolute limit
on the memory ranges that can be set. Whenever a limit is reached, it can
be changed. This results in a reduction of free RAM.
To ascertain a suitable value for PRAM, current values can be read in
commissioning mode. These values are shown in the following system vari-
ables:
PS.PRAM_SIZE
PS.PRAM_FREE
PS.RAM_SIZE
PS.RAM_FREE
The maximum number of objects that can be loaded on the resource
Memory size in Kbytes that is reserved for the configuration data. This
memory area is cold-start resistant.
Maximum size of memory required by the project for transfer of redundancy
data.
The redundancy memory is only shown in redundant and plausible
process stations.
Communication management parameters. Every communication link re-
quires internal system resources such as additional memory or system ob-
jects.
Area of memory in Kbytes that is reserved for the communication links.
Maximum number of objects that can be reserved for interfaces.
The PRAM size set in the boot parameters
The proportion of free PRAM
The amount of RAM in use
The proportion of free RAM
ABB FieldController 800