Command Repetition - Siemens SIMATIC RF650R Configuration Manual

Interface to the SIMATIC controller
7.7 Programming the Ident profile
7.7.6

Command repetition

The Ident profile supports command repetition (Repeat command).
Note
Command repetition is supported only as of V2
Command repetition is currently not supported by the RF680R/RF685R readers (status
October 2014). The function is, however, in preparation and will be supported in the coming
version of the readers.
How it works
After a restart (or "INIT") of the reader, the Ident profile transfers the command or command
chain once to the reader. Transmission of the command is automatic with the first
"EXECUTE". This command (or the last command or the command chain) always remains
buffered on the reader. If command repetition is started, the temporarily stored command on
the reader is executed again, and the result(s) transferred to the Ident profile.
Make sure that the "EPC-ID/UID" of the commands to be repeated have the value 0. If the
EPC-ID as a different value, an error message is generated.
Effects of command repetition
● The data transfer on PROFIBUS/PROFINET is minimized. This reduction has a positive
effect particularly with extensive bus configurations and slow transmission speeds.
● The reader processes each transponder regardless of the Ident profile. This has a
particularly advantageous effect on gate applications since all transponders are always
identified with the full reader scan speed.
● Total data throughput is increased considerably particularly with controllers that have few
system resources for acyclic frames.
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SIMATIC RF650R/RF680R/RF685R
Configuration Manual, 10/2015, C79000-G8976-C386-03