Laboratory control for test series

Description
This SCL function block, FB_HeatingMeasuringCycle, controls an automated heating and measuring process with multiple heating cycles. It provides backup in the event of a stop or emergency stop signal, operates an agitator in heating mode, and records the measurement results after temperature stabilization. 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. Stop/Emergency Stop active → Heating & agitator off, error flag on, HMI “STOP / EMERGENCY STOP”, RETURN
2. Phase 0 (Ready): Waiting for start signal
3. Phase 1 (Heating): Heating & agitator on until temp > 60 °C
4. Phase 2 (Stabi): Heating off, 10 s TON timer, save measurement result
5. Phase 3 (Pause): Stirrer on for 5 s TON timer, cycle counter++
6. CycleIndex < Target area → back to phase 1
7. Phase 4 (End): Heater & agitator off, HMI “TEST COMPLETED”

Technical details
• Inputs: Stop, Emergency Stop, Start, Temperature, Measured Value, Number of Cycles
• Outputs: Heating, Agitator, Error, StatusText_HMI
• ONE-TONE timer with variable PT for stabilization (10 s) and pause (5 s)
• INT variable #Phase in CASE structure, RETURN in case of safety state

Possible applications
• Automated heating and measurement cycles in laboratory and pilot plants
• Chemical or reactor engineering, process engineering
• Retrofit and demonstration projects in training and education environments

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

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

Support
Adjustment of temperature limits, number of cycles or pause times, integration of additional sensors and HMI layouts on request via shop message or email.