Siemens SIMATIC MV500 Operating Instructions Manual page 159

The following commands are supported:
Table 9- 9 PHYSICAL-WRITE
CMD OFFSET ADDR_
BUFFER TAG
0x71 Offset in 0x0000
the
"TXREF"
send buff-
er
Command: Program change (write program number)
You can perform a program change using the "PHYSICAL WRITE" command. The command
contains the data of the following table. If the program change is successful, the "WRITE"
command receives a positive acknowledgment; otherwise, it receives a negative
acknowledgment.
Before the program change, the "DISA" bit in the optical reader is automatically set and reset
after the program change. If the "DISA" bit was set manually prior to the program change, it
will remain set.
The "WRITE" command must specify the length "0x02" ("CMD_STRUCT.LEN_DATA = 0x02");
otherwise, the command receives a negative acknowledgment. If an attempt is made to
change to an unsaved program or a program number > "0x0F", the command will also be
denied and receive a negative acknowledgment.
Table 9- 10
Parameter
CMD
OFFSETBUFFER
EPCID_UID
LEN_DATA
ADDR_TAG
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
LEN_DATA
Length of data to be sent to the read-
er:
• 02
• 01
• Match string length + 3
• 01
• 01
• 01
• 07
CMD_STRUCT
Value
0x71
0x00
0x00
0x02
0x00
Process interfacing via an automation system (PLC, PC)
TXREF
Sub-command with data to be sent to the read-
er. The first SINT contains the command identi-
fier:
• 01 = Program change (write program num-
ber)
• 02 = Activate read program number (once)
• 03 = Write match string
• 04 = Activate read match string (once)
• 05 = Set DISA bit
• 06 = Reset DISA bit
• 08 = Set digital Out
9.3 Control with Ident profile
159