Silo level monitoring

Description
This SCL function block, FB_SiloRefill, monitors the fill level of a silo in digital or analog mode and automatically controls refilling as well as alarm and display signals. It runs in the Siemens TIA Portal.

Note: All modules are designed exclusively as a learning and optimization basis and are not approved for live operation. System modules, in particular, must be finally tested and commissioned by qualified personnel before productive use.

How it works

1. AnalogMode = FALSE (digital)

• SensorEmpty = TRUE → AlarmEmpty = TRUE, Refill = TRUE, StatusText = “Silo empty – Refill”
• SensorFull = TRUE → DisplayFull = TRUE, AlarmEmpty/Refill = FALSE, StatusText = “Silo full”

1. If both sensors are FALSE → StatusText = “Fill level in normal range”
2. AnalogMode = TRUE (analog)
3. • Fill level < Empty limit → AlarmEmpty = TRUE, StatusText = “Silo empty (analog)”
   • Fill level > Full limit → DisplayFull = TRUE, StatusText = “Silo full (analog)”
4. Otherwise → StatusText = "Fill level in normal range", AlarmEmpty/DisplayFull = FALSE

Technical details
• Inputs: SensorEmpty, SensorFull, AnalogMode (BOOL), Level (REAL), EmptyLimit (REAL), FullLimit (REAL)
• Outputs: AlarmEmpty, DisplayFull, Refill (all BOOL), StatusText (STRING)
• Pure IF/ELSIF logic separates digital/analog and assigns sensor or limit value results directly to the outputs

Possible applications
• Automatic refill control in storage, mixing or feeding systems
• Retrofit of existing silos without complex hardware changes
• Training and demonstration modules for level monitoring

compatibility
Siemens S7-1200 & S7-1500, TIA Portal ≥ V13 (recommended V16+ for HMI & PLCSIM)

Scope of delivery
• .scl file with input/output declarations, variables and header comment (version, author, website, email)
• Download link immediately after purchase

Support
Adjustment of limit values, integration of additional sensors or HMI layouts on request via shop message or email.