Planning the RF200 system
4.1 Fundamentals of application planning
SIMATIC RF200
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System Manual, 07/2017, J31069-D0227-U001-A9-7619
4.1.7
Dwell time of the transponder
The dwell time is the time in which the transponder remains within the transmission window
of the reader. The reader can exchange data with the transponder during this time.
The dwell time is calculated as follows:
t
V
:
Dwell time of the transponder
L:
Length of the transmission window
v
Tag
:
Speed of the transponder (tag) in dynamic mode
0.8:
Constant factor used to compensate for temperature influence and production toler-
ances
The dwell time can be of any duration in static mode. The dwell time must be sufficiently long
to allow communication with the transponder.
The dwell time is defined by the system environment in dynamic mode. The volume of data
to be transferred must be matched to the dwell time or vice versa. As a general rule:
t
V:
:
Dwell time of the data memory in the field of the reader
t
K
:
Communication time between transponder and communication module
or Calculation of the maximum amount of user data
t
K
:
Communication time between transponder and communication module
K
Constant; the constant is an internal system time. This includes the time for power
buildup on the MDS and for command transfer
t
Byte
Transmission time for 1 byte
n
Amount of user data in bytes
n
max
Maximum amount of user data in bytes in dynamic mode
t
V
Dwell time of the data memory in the field of the reader
