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C60_2-028_823024_0401-e.p65
9
Protocol
10
Initializing the
data carrier
10
E
BIS C-60_2 Processor
Optimized data carrier memory management
The BIS C-60_2-028 version works with a further developed Balluff protocol, which optimizes
memory handling in the data carrier. This version would be required whenever the required
number of write cycles exceeds the number permitted for the EEPROM in the data carrier.
Depending on type, this will lie between 100,000 and 1,000,000 cycles and is indicated on the
data sheet for each respective data carrier. You must select a data carrier whose memory size
is a multiple of the number of bytes actually used for writing.
For any given data carrier the maximum number of write cycles permitted can be calculated
as follows:
W = W
K
= Memory size of data carrier in bytes
CT
W
= maximum number of write cycles for data carrier per data sheet
CT
n
= maximum number of bytes for read/write commands
Using this intelligent method of memory handling, the number of write cycles is stored in a
counter. When the permitted number is reached, the previously used memory range is blocked
and a new memory range is used. This process is continued until the last memory range is
used up. During the last 1,000 write cycles the processor acknowledges all successful write
operations with a 'pre-warning' (56
When the maximum number of write cycles for the last memory range is reached, writing to
this memory range continues but an additional 'final warning' is indicated (45
02
of the input buffer).
Hex
BIS C-60_2 Processor
Optimized data carrier memory management
In order to use a data carrier for memory optimization, the data carrier must first be initialized.
This can be done either with the Handy Terminal BIS C-800, or from a PC station with a built-
in BIS C-480-007-PC card, or using the initializing command of BIS C-60_2-028.
The first 5 bytes of the memory are used for the designator:
K
- 5
CT
*
CT
n + 4
in subaddress 02
of the input buffer).
Hex
Hex
in subaddress
Hex
E
9
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