Width Of The Transmission Window; Transmission Window With Auxiliary Fields - Siemens SIMATIC MOBY D System Manual

4.1.2

Width of the transmission window

Determining the width of the transmission window
The following approximation formula can be used for practical applications:
W:
L:
Tracking tolerance
The width of the transmission window (W) is particularly important for the mechanical
tracking tolerance. The formula for the dwell time is valid without restriction when W is
observed.
4.1.3

Transmission window with auxiliary fields

In general, auxiliary fields always exist. They can be found outside the antenna conductor
loop and must be used for configuring only in exceptional cases since the write/read
distances are limited.
In the case of parallel movement of the MDS with a short operating distance through the
antenna field, a transmission-free space is traversed when moving from the auxiliary field to
the main field and also when exiting the main field (multiple presence change possible).
Precise information on the field geometries of the auxiliary fields cannot be given since the
values depend heavily on the operating distance and the application area.
①
②
③
Figure 4-2
MOBY D
System Manual, 01/2010, J31069-D0147-A6-7618
Width of transmission window (median deviation)
Length of the transmission window
SLG
Main field
Secondary fields
Transmission window with auxiliary fields for SLG
Planning the MOBY D system
4.1 Fundamentals of application planning
27