Siemens SIMATIC MV440 - Page 263

Process interfacing via an automation system (PLC, PC)
10.3 Control with FB 45 and Ident profile
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
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Table 10- 32 PIB_COMMAND
Parameter Value
CMD 0x70
OffsetBuffer 0x00
UID 0x00
Length ≥ length of the result string
StartAddress 0x00
Table 10- 33 Command data area (FB45: Data DB, RFID standard profile: TXBUF or RXBUF)
Address Value Meaning
0x0000 0x00-0xFF Length of the entire result string
(more significant byte)
0x0001 0x00-0xFF Length of the result string (less
significant byte)
0x0002 1st character of the result string
0x0003 2nd character of the result string
… …
(n + 1) (n–1)th character of the result
string
(n + 2) nth character of the result string
Command: Read result string
Using the same mechanism as "Read trigger + result string", it is possible to read out the
decoded string via ASM.
If the trigger source selected in the adjustment support is not "ASM", the READ command
does not activate a trigger but simply returns the result of the decoding.
If a result is already available, this is returned. If there is not yet a result string available, the
system waits until a result string is available.
After processing the command, the result string is available in the command data area
specified in the command ("MOBY_CMD".DAT_DB_number "instance DB-RFID standard
profile".RXREF).
You can abort processing of the command by setting the "MOBY Param".init_run (FB45) or
"instance DB-RFID standard profile".INIT bit (RFID standard profile).