Siemens SIMATIC MV500, Operating Instructions Manual, Page: 172 / 294

Process interfacing via an automation system (PLC, PC)
9.4 Control with FB 79
SIMATIC MV500
172
Operating Instructions, 03/2021, C79000-G8976-C494-05
9.4.1 Assignment of the interfaces relevant to PROFINET IO
Control/status byte
Table 9- 33 Assignment of control bytes (input signals)
Bit Signal Description
0 DISA Disable
Disables manual keyboard input, program selection and program sav-
ing, error acknowledgment, starting the optical reader
1 SEL0
1)
Select 0
Program selection bit 0
2 SEL1
1)
Select 1
Program selection bit 1 (with TRN = 0) / save program (with TRN = 1)
3 SEL2 1) Select 2
Program selection bit 2
4 SEL3
1)
Select 3
Program selection bit 3
5 TRN
1)
Save program
Saves new program.
6 TRG Trigger
Processing starts on a positive edge.
7 RES Reset
Reset error.
1)
The signals only work if "DISA = 1".
Table 9- 34 Assignment of status byte (output signals)
Bit Signal Description
0 IN_OP In operation
•
0: Error message is displayed.
• 1: Optical reader functional, no error
1 TRD Program saved
•
In run:
– 0: Selected program is not saved.
– 1: Selected program has been saved.
• With Save program (TRN = 1)
– 0: Save program active
– 1: Acknowledgment signal (RDY = 0)
2 RDY Ready
•
0: Startup of the optical reader or optical reader in the "Stop"
• 1: Optical reader in "Start"