Siemens SIMATIC Ident System Manual page 284

Glossary
RFID systems
SIMATIC RF identification systems control and optimize material flow and production
sequences. They identify reliably, quickly and economically, use non-contact data
communication technology, and store data directly on the product. They are also resistant to
contamination.
S
a
Operating distance between transponder and reader
Secondary fields
The strength of the secondary fields, which exist in addition to the transmission window, is
usually lower than that of the transmission window and depends on the metallic environment.
Secondary fields should not be used in configuring.
S
g
See limit distance
Static mode
In static mode the transponder is positioned at a fixed distance (maximum: limit distance)
exactly above the read/write device.
Tag
See transponder
Telegram cycles
The transfer of a read or write command takes place in three cycles, known as message
frame cycles. 1 or 2 bytes of user data can be transferred with each command. The
acknowledgement transfer (status or read data) takes place in 3 further cycles.
Transmission distance
Distance between communication module (read/write device) and transponder (mobile data
storage unit)
Transmission window
Area in which reliable data exchange between transponder and read/write device is possible
due to a particular minimum field strength.
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System Manual, 09/2013, J31069-D0227-U001-A8-7618
SIMATIC RF200