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Process interfacing via an automation system (PLC, PC)
10.3 Control with FB 45 and Ident profile
SIMATIC MV420 / SIMATIC MV440
250
Operating Instructions, 04/2013, A5E02371045-06
Command: Read program number
The "Read program number" command is used to prepare reading of the current program
number.
The MV command itself does not perform the actual read. For this reason, the data of the
WRITE command contains only the MV command itself.
The user sends the MV command "Read program number" with the WRITE command and
waits for a positive response. A READ command is then used to read out the actual program
number, see also READ commands (Page 260).
The WRITE command must specify a length of 0x1 ("MOBY_CMD".length or
"PIB_COMMAND".Length = 0x1), otherwise a negative response will be sent.
Table 10- 10 Moby_CMD
Command
[hex]
Sub_
Command
[hex]
Length
[dec]
Address_
MDS [hex]
DAT_DB_number
[dec]
DAT_DB_address
[dec]
Number of the
data DB (for example
48)
Pointer to the start
word
(for example 0)
01
-
1
0
Pointer to the user data to be sent to the
reader.
Table 10- 11 PIB_COMMAND
Parameter
Value
CMD
0x71
OffsetBuffer
0x00
UID
0x00
Length
0x01
StartAddress
0x00
Table 10- 12 Command data area (FB45: Data DB, RFID standard profile: TXBUF or RXBUF)
Address
Value
Meaning
0x0000
0x02
"Read program number"
command identifier
Содержание SIMATIC MV420
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