Process interfacing via an automation system (PLC, PC)
10.4 Control with FB79
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
271
Status byte
Bit no. Corresponds to
signal
Function
0
IN_OP
In operation:
•
0 = error message is displayed.
•
1 = reader functioning, no error
1
TRD
Program saved:
•
In run:
–
0 = Selected program has not been saved.
–
1 = Selected program has been saved.
•
When saving program (TRN=1)
–
0 = Save program active
–
1 = acknowledgment signal (RDY=0)
2
RDY
Ready:
•
0 = startup of reader or reader in stop
•
1 = reader in run
3
READ
Processing result: Code was localized and decoded.
4
MATCH
Processing result: Code matches the trained code.
5
N_OK
Code was not legible.
6
-
Reserved
7
-
Reserved
Note
Writing the control byte and reading and evaluating the status byte must be performed in the
same way as in the time diagrams shown in the description of how to select modes.
Summary of Contents for SIMATIC MV420
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