Siemens SIMATIC RF300 - Page 31

RF300 system planning
4.1 Fundamentals of application planning
SIMATIC RF300
System Manual, Release 04/2006, J31069 D0166-U001-A2-7618
4-11
Minimum distance from reader to reader
Refer to the field data of the reader for this value.
Minimum distance from transponder to transponder
Refer to the field data of the transponder for this value.
Calculation of the maximum amount of user data in dynamic mode
Step Formula/calculation
1. Calculate dwell time of the
transponder
Refer to the "Field data of all transponders and readers" table for value L.
Value V
TPDR
= 0.14m/s
TPDR
v t
v
⋅ ⋅
== ==
L 0,8
0,038m 0,8
0,217s
0,14m/s
217ms
2. Calculate maximum user data (n
max)
for reading
Take value t
v
from Step 1.
Take values K and t
Byte
from Table "Time constants K and t
Byte
".
max.
217
13.47 13
15
Byte
v
t
byte
t
−
=
=
⇒
n
ms
ms 15ms
K
−
=
5HDG
3. Calculate maximum user data (n
max)
for writing
(FRAM area)
Take value t
v
from Step 1.
Take values K and t
Byte
from Table "Time constants K and t
Byte
".
max.
217
13.47 13
15
Byte
v
t
n
t
−
=
byte
=
⇒
=
ms 15ms
ms
K
−
:ULWH
Result
A maximum of 13 bytes can be read or written when passing the transponder.