Siemens SIMATIC RF610T ATEX System Manual page 240

Antennas
6.2 SIMATIC RF615A
A A ngle deviation diagram for alignment
The following diagram shows the dependence of the following factors:
Alignment angle of transponder to antenna
Maximum range of antenna
Figure 6-4
240
Effect on the read/write range depending on the antenna alignment
System Manual, 06/2019, J31069-D0171-U001-A22-7618
SIMATIC RF600