Process interfacing via an automation system (PLC, PC)
10.6 Control via TCP/IP and RS-232
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
313
Detailed structure of the user data
Note
Data type BYTE and WORD
• BYTE: 8 bits
• WORD: 16 bits, in Big Endian format ("S7 format")
Meaning Data type Value range Comment
Total length in bytes
(excluding the length
itself = starting at trigger ID)
WORD max. 32768
Trigger ID WORD 1 ... 32767
Flags BYTE Bit 0: Permanent flag
Bit 1 to 7: Reserved, must be 0
Code No Cnt n BYTE 1
Code No BYTE 1 ... 14
Code Idx Cnt c BYTE SIMATIC MV440 UR: 0 ... 150
All other readers: 0 ... 50
Code Idx BYTE SIMATIC MV440 UR:
1 ... 150
All other readers:
1 ... 50
String length cl WORD 1 ... 3001
String cm cl BYTEs Any
ASCII characters
c times
ROI ID Cnt r BYTE 0 ... 5
ROI ID BYTE 1 ... 5
String length rl WORD 1 ... 255
String rm rl BYTEs Any
ASCII characters
t times
Area over which the
checksum is formed.
XOR checksum BYTE 0 ... 255 Checksum = 0 means no
checksum
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