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S5 to S7 Conversion Assistance

Based on the provided S5 code snippet and error messages, here's a breakdown of common conversion issues and potential solutions:

Identified Issues & Corrections

• CDB 4 OPN DB 4;: In S7, use CALL DB4 to access the data block.
• LIR 2// LIR 2; & TIR 2 // TIR 2;: These are likely intended as immediate loading/transferring instructions. S7 uses LIR 2 and TIR 2 directly – the double slash (//) is unnecessary and may cause issues.
• TAK TAK;: This instruction is generally correct in both S5 and S7.
• T DW 3 T DBW 6;: This instruction appears valid for transferring data, double-check addressing.
• L KH E410 L W#16#E410: This instruction appears valid for loading a constant, double-check addressing.
• R F 90.2R M 90.2; & JU=M007JU M007; : These instructions appears valid but double-check addressing.

General Conversion Notes

• Addressing Differences: S5 uses symbolic addressing (like `KH`, `DW`), while S7 often uses absolute addressing (like `W#16#...`, `DBW...`). Ensure correct translation.
• Data Types: Verify data types are compatible during conversion (e.g., `INT`, `REAL`, `BOOL`).
• Function Block Calls: S7 requires explicit `CALL` instructions for function block execution.

Resources

For detailed conversion guidance, refer to the Siemens documentation:

• S5 to S7 Conversion Guide
• SiePortal (for comprehensive documentation and tools)

Disclaimer: This is a general assessment. A complete conversion requires a thorough analysis of the entire S5 program and careful consideration of the target S7 hardware and software configuration.