Process interfacing via an automation system (PLC, PC)
9.3 Control with Ident profile
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
167
Table 9- 28 Command data area (TXREF or RXREF)
Command: Read match string
To have the current match string returned when the "READ" command is received, the MV
command "Read match string" ("PHYSICAL WRITE" command) must be sent immediately
before. You can find more information on this subject in the section ""PHYSICAL WRITE"
commands / MV command interface (Page 158)".
After processing of the "PHYSICAL READ" command, the following data is available in the
memory area of the receive data:
If the length of the data to be read ("CMD_STRUCT.LEN_DATA") is not n + 2 bytes (n = total
length of the match string), the match string is truncated or the command data area is
padded with "0x00".
Table 9- 29 CMD_STRUCT
≥ total length of the match string + 2
Table 9- 30 Memory area of the receive data (TXREF or RXREF)
Length of the total match string
(more significant byte)
Length of the total match string
(less significant byte)
1st character of the match string
nth Characters of the match string
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