Siemens SIMATIC MV500 - Page 159

Process interfacing via an automation system (PLC, PC)
9.3 Control with Ident profile
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
159
The following commands are supported:
Table 9- 9 PHYSICAL-WRITE
CMD OFFSET
BUFFER
ADDR_
TAG
LEN_DATA TXREF
0x71
Offset in
the
"TXREF"
send buff-
er
0x0000
Length of data to be sent to the read-
er:
Sub-command with data to be sent to the read-
er. The first SINT contains the command identi-
fier:
• 02 • 01 = Program change (write program num-
ber)
• 01 • 02 = Activate read program number (once)
•
Match string length + 3
•
03 = Write match string
• 01 • 04 = Activate read match string (once)
•
01
•
05 = Set DISA bit
• 01 • 06 = Reset DISA bit
•
07
•
08 = Set digital Out
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 CMD_STRUCT
Parameter
Value
CMD
0x71
OFFSETBUFFER
0x00
EPCID_UID
0x00
LEN_DATA
0x02
ADDR_TAG
0x00