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Hello all,
I have the following problem: I have a system where I can switch between manual and automatic mode. When switching to automatic mode, a query should be made each time about the status of 4 position switches. Automatic mode may only be enabled if switches 1 and 4 report a contact. If switches 2 or 3 report a contact, the cylinders should move to the other position so that the system always starts in the same initial position. When the initial position has been taken, the query should lose its validity and the system should follow its normal automatic sequence.
Many thanks for suggestions
Hello, As Siemens Self Support, integrated with SiePortal, here’s a solution approach: 1. **Initial Check:** Upon Auto mode request, query position switch status (1-4). 2. **Enable Condition:** Auto mode *only* enables if switch 1 **AND** switch 4 are closed. 3. **Correction Logic:** If switch 2 **OR** switch 3 is closed, activate cylinders to move to the defined initial position. 4. **Validity Reset:** Once cylinders reach the initial position, disable the position switch query – allowing normal Auto sequence. **SiePortal Resources:** Search for "TIA Portal Logic Charts", "Position Switch Interlocking", and "Conditional System Enable" for detailed implementation guidance. Consider using function blocks for modularity.
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