Siemens SIMATIC MV550 S Operating Instructions Manual page 114

Process interfacing via an automation system (PLC, PC)
9.3 Control with Ident profile
Table 9- 11
Address
0x0000
0x0001
Command: Read program number
You can prepare to read the current program number using the "Read program number"
command.
The MV command itself does not perform the actual read. Therefore, the data of the
"PHYSICAL WRITE" command only includes the MV command itself.
Before performing the "PHYSICAL READ" command, you need to execute the MV command
"Read program number" with the "PHYSICAL WRITE" command. If this receives positive
acknowledgment, you must then read out the actual program number with a "PHYSICAL
READ" command. You can find more detailed information on the "PHYSICAL READ"
command in the section ""PHYSICAL READ" commands (Page 119)".
The "PHYSICAL WRITE" command must specify the length "0x01"
("CMD_STRUCT.LEN_DATA = 0x01"); otherwise, the command receives a negative
acknowledgment.
Table 9- 12
Parameter
CMD
OFFSETBUFFER
EPCID_UID
LEN_DATA
ADDR_TAG
Table 9- 13
Address
0x0000
Match string
Note
Sent match string takes effect immediately
A sent match string takes effect immediately. The sent match string is not synchronized with
the trigger signal or the processing of buffered acquired images.
Therefore, ensure that the match string is sent when no image acquisition is running.
114
Memory area of the receive data (TXREF or RXREF)
Value
0x01
0x00 ... 0x0F
CMD_STRUCT
Value
0x71
0x00
0x00
0x01
0x00
Memory area of the receive data (TXREF or RXREF)
Value
0x02
Meaning
"Program change" command identifier
Number of the program
Meaning
"Read program number" command identifier
Operating Instructions, 05/2019, C79000-G8976-C494-02
SIMATIC MV500