Siemens SIMATIC S7-1500R/H Getting Started page 38

Flow diagram of the user program OB30
The OB30 contains the user program of the tunnel application with three function blocks for:
● The fan control in the tunnel (FB10)
● The traffic light and barrier control (FB20)
● The lighting control in the tunnel (FB30)
● DB1 contains the HMI tags for the HMI screen.
Figure 3-1
Flow diagram for fan control in FB10
Turbidity measurement and air quality measurement:
FB10 calls FB11. FB11 reports:
● The status of the air pollution level
● A pollutant concentration above the maximum value, which lasts longer than 2 minutes, to
block the tunnel
S7-1500R/H redundant system
Getting Started, 10/2018, A5E44910930-AA
Flow diagram for user program in OB30
Programming
37