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.
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