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Siemens SIMATIC RF300 System Manual Page 41

Simatic sensors.
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Time constants K and t
Table 4- 5
Static mode
Transfer rate
[baud]
Data volume
≤ 233 bytes
K
[ms]
19200
28
57600
15
115200
11
The values for K and t
byte
several different times:
Serial communication between communication module, reader and
Processing time between reader and transponder and their internal processing time.
The values shown in the table must be used when calculating the maximum quantity of user data in static mode. They are
applicable for both reading and writing in the FRAM area.
For writing in the EEPROM area (max. 20 bytes), the byte time t
Table 4- 6
Independent
Independent
Write
Read
In dynamic mode, the values for K and t
communication time only includes the processing time between the reader and the
transponder and the internal system processing time of these components. The
communication times between the communication module and the reader do not have to be
taken into account because the command for reading or writing is already active when the
transponder enters the transmission field of the reader.
The values shown above must be used when calculating the maximum quantity of user data
in dynamic mode. They are applicable for both writing and reading.
Time constants K and t
Table 4- 7
K (ms)
15
15
30
The table of time constants applies to every command. If a user command consists of
several subcommands, the above t
SIMATIC RF300
System Manual, 01/2009, A5E01642529-03
for medium and high-performance applications
byte
RF300 mode
FRAM
Read/write
Data volume
>233 bytes
t
K
byte
[ms]
[ms]
0.67
28
0.30
25
0.21
30
include the overall time that is required for communication in static mode. It is built up from
Dynamic mode
Transfer rate
Memory area
[baud]
FRAM
EEPROM
for low-performance applications (IQ-Sense)
byte
Static mode
t
(ms)
Command
byte
15
Read (FRAM/EEPROM area)
15
Write (FRAM area)
30
Write (EEPROM area)
Read
Data volume
≤ 233 bytes
t
K
t
byte
byte
[ms]
[ms]
[ms]
0.67
35
1.08
0.22
34
0.59
0.12
26
0.56
is approx. 11 ms.
Byte
RF300 tags
K [ms]
8
8
8
are independent of the transmission speed. The
byte
formula must be applied to each subcommand.
K
RF300 system planning
4.1 Fundamentals of application planning
ISO mode
Data volume
Independent of data
>233 bytes
K
t
byte
[ms]
[ms]
[ms]
64
0.75
41
34
0.59
28
26
0.56
26
t
[ms]
K [ms]
byte
0.13
-
12.20
15
0.13
12
Write
volume
K
t
byte
[ms]
2.66
2.28
2.17
ISO tags
t
[ms]
byte
-
1.99
0.56
41

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