feed mixing plant

Description
This SCL function block FB_Mixing_Process fully automatically controls a mixing process with dosing of two ingredients, stirring, and emptying. It provides continuous status texts via the HMI.

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. Emergency Stop = TRUE or Reset Mixer = TRUE → all actuators off, alarm off, step = 0, HMI "Ready", RETURN
2. Step 1: Screw1 doses until ActualWeight ≥ TargetWeight1
3. Step 2: Screw2 doses until ActualWeight ≥ TargetWeight2
4. Step 3: LidClosed = TRUE → mixer on, 20 s sound timer; LidClosed = FALSE → alarm, RETURN
5. Step 4: SOUND timer expired → Mixer off
6. Step 5: Emptying on until MixerEmpty = TRUE
7. Step 6: Emptying off, HMI “Mixing completed”, waiting for reset

Technical details
• Inputs: Emergency Stop, Reset Mixer, Start, Lid Closed, Mixer Empty, Actual Weight, Target Weight 1, Target Weight 2
• Outputs: Screw1, Screw2, Mixer, Emptying, Alarm, StatusText
• TON timer (PT=T#20s) for mixing duration
• Sequence control via INT variable step in CASE structure
• RETURN in case of emergency stop/reset immediately interrupts all actions

Possible applications
• Batch mixing systems in the food or chemical industry
• Laboratory and pilot plants for formulation tests
• Contract manufacturing with precise dosing
• PLC training on cyclic sequence controls

compatibility
Siemens S7-1200 & S7-1500; TIA Portal V13 and higher (V16+ recommended for PLCSIM & HMI)

Scope of delivery
.scl file with input/output declaration, timer instances, CASE logic, and header comments; download link immediately after purchase

Support
Adjustment of dosing quantities, safety functions, mixing/emptying times or HMI integration on request via shop message or email.