Siemens SIMATIC Ident System Manual page 61

The permissible minimum distance between two RF380Rs depends on the transmit power
1)
that is set. The specified minimum distance must be multiplied by the following factor,
depending on the output:
Table 4- 27
'distance_limiting' byte
02; 03
04; 05; 06
07; 08
Minimum distance from antenna to antenna
Table 4- 28
ANT 1
≥ 100
All values are in mm
You will find detailed information on the minimum distances between antennas the section
"Minimum distance between antennas (Page 200)".
Note
Effect on inductive fields by not maintaining the minimum distances of the readers
If the values fall below the values specified in the "Minimum distance readers" and "Minimum
distances antennas" tables , there is a risk of the function being affected by inductive fields.
In this case, the data transfer time would increase unpredictably or a command would be
aborted with an error.
Keeping to the values specified in the "Minimum distance readers" and "Minimum distances
antennas" tables is therefore essential.
If the specified minimum distance cannot be complied with due to the physical configuration,
the SET-ANT command can be used to activate and deactivate the RF field of the reader.
The application software must be used to ensure that only one reader is active (antenna is
switched on) at a time.
Note
Please also observe the graphic representations of the minimum distances in the respective
chapters on readers.
SIMATIC RF300
System Manual, 07/2016, C79000-G8976-C345-0x
Effect on the minimum distance of the transmit power with RF380R
Factor
0.8
1.0
1.2
Minimum distances antennas
ANT 3 ANT 3S
≥ 80 ≥ 20
4.2 Field data for transponders, readers and antennas
ANT 8 ANT 12
≥ 50 ≥ 70
Planning the RF300 system
ANT 18 ANT 30
≥ 100 ≥ 100
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