Technical data

R911305038 / 01 | Rexroth VCP-Operating Concept Electric Drives and Controls | Bosch Rexroth AG 5-189
Standard Mode
5.23.3.8 Memory Requirement for Data Sets
The RAM in the operating device that is not required by the system
(approximately 110000 bytes) is used to store messages as well as
data sets that have been stored in the RAM.
The size of the message buffer is configurable. Each message takes
up 24 bytes. This makes a total of 12000 bytes for the default message
buffer size (500 messages), so that a further 98000 bytes are available
for storing data sets.
Space is also needed to store the data set name and management
information (additional 28 bytes per data set).
Example:
If the data set size is programmed as 22 bytes, a total of
98000 / (22 + 28) = 1960
data sets can be saved in the RAM (message buffer size: 500). Other,
fixed programmed data sets can also be stored in the Flash Eprom.
5.24 Memory Requirement for Messages and Data Sets
Depending on the operating device, different storage quantities are
available, which are also used differently for messages and data sets.
You must expect three times the memory requirement for the following
message variants:
1. Messages containing 2 variables
2. Messages with 'Appear/Disappear'
3. Messages with acknowledgment ('Appear/Disappear' active).
4. Messages whose first variable has a size of greater than 4 bytes
Z80-CPU 32 Bit RISC CPU
Available Memory Space in Bytes About
116000
About 116000 for FW version 1.07 or lower
About 147000 for FW version 1.08 or higher
Memory Requirement per Mes-
sage (=1 Memory Location)
24 Bytes 32 Bytes
Memory Requirement per Data
Set without User Data
33 Bytes 44 Bytes
Fig. 5-75: Memories in operating devices in comparison