Read And Write Range - Siemens SIMATIC RF600 System Manual

Mode
Single tag mode: Read
Single tag mode: Write
Multitag mode: Read
Multitag mode: Write
4.3.6

Read and write range

The read/write range between the reader/antenna and the transponder is influenced by the
following factors:
The reading range depends on
Transmit power of the reader
Tag size and type
Absorption factor of the materials
Production quality of the tag
Reflection characteristics of the
environment
Number of transponders in the antenna
field
You will find detailed information about the reading range of the individual readers in the
"Technical specifications" in the sections for the various readers.
SIMATIC RF600
System Manual, 05/2012, J31069-D0171-U001-A13-7618
Max. number of tags Min. distance [m] between
- two readers with internal antennas
- two RF660A antennas
1 3
1 3
40 6
10 6
Description
The higher the transmit power of the reader, the larger the
reading range.
The larger the tag antenna, the larger the power input area
and therefore the larger the reading range.
The higher the absorption of the surrounding material, the
smaller the reading range.
The better the tag has been matched to the operating
frequencies during manufacturing, the greater the reading
range.
In a multiple-reflection environment (e.g., in rooms with
reflecting surfaces, machinery, or concrete walls), the
reading range can be significantly higher than in a low-
reflection environment.
The typical ranges always relate to a transponder installed
at the maximum possible distance from the antenna.
If there is more than one transponder in the antenna field,
the distance to all other transponders must be less to allow
them to be acquired in the antenna field.
The width and height of the antenna field within which its
transponders can be arranged at a certain distance from
the antenna depend on the following:
•
•
•
•
The radiated power,
Only reading or reading and writing the transponders
(writing requires more power, typically double the
power)
The aperture angle (horizontal)
The aperture angle (vertical)
RF600 system planning
4.3 Antenna configurations
51