Investigate the PCS 7 Compile Error for red_adr in F_CH_DI3
For the compile message value red_adr is not defined in file AL_FCHN3.xml / F_CH_DI3, the available material does not establish a verified root cause or universal fix. The discussion's reply suggests checking the fail-safe module configuration, safety mode, symbolic channel addresses and F-channel driver connections. Treat those as source-reported diagnostic checks only; confirm them against the installed PCS 7/F-Systems version and the actual hardware configuration before changing a safety project.
Table of Contents
- Reported symptom and scope
- Checks proposed in the discussion
- Use a version-matched diagnostic workflow
- Safety project controls
- What is not established
- Verification
- Limitations and Operational Precautions
- Engineer FAQ
- Technical References
- Related Articles
- Related Tags
Reported symptom and scope
The compile diagnostic names red_adr, AL_FCHN3.xml and F_CH_DI3. The thread is split from a separate BITVAL diagnostic, so the two messages should not be assumed to share one cause. No PCS 7 version, F-Systems version, module order number, screenshot, full compile log or outcome is provided.
Checks proposed in the discussion
The reply proposes checking that an F-module is present in Hardware Configuration, that the module is configured for Safety mode, that the F-DI addresses have symbol names, and that each F-channel driver is connected to the intended symbolic address and hardware address. These checks are hypotheses reported in the forum response, not a Siemens-confirmed explanation of the exact red_adr compiler message.
Use a version-matched diagnostic workflow
- Save the complete CFC compile diagnostic and identify the project's PCS 7, STEP 7/F-Systems and relevant library versions.
- In Hardware Configuration, identify the exact F-signal module and its configured mode and channel/address assignments.
- Compare the project symbol table with the F-channel driver interconnections. Confirm that each symbolic address resolves to the intended physical channel; do not substitute a guessed absolute address.
- Check whether the relevant module-driver generation and F-channel driver configuration match the procedures for the installed release.
- Recompile only after documenting the configuration changes and reviewing their impact on the safety program. If
red_adrremains undefined, provide Siemens support with the full diagnostic, module details and project version information.
Safety project controls
Changes to fail-safe hardware, F-addresses, channel drivers or safety logic can affect the validated safety application. Follow the project's safety lifecycle, access restrictions, independent review, validation and change-control requirements. Do not download modified safety configuration to a running plant based only on a generic forum checklist.
What is not established
The available source does not show that red_adr is a field or parameter the engineer should create manually, nor does it explain whether the XML file is missing, stale, malformed or generated from a particular configuration. The error's exact semantics could not be verified in accessible Siemens documentation. Do not edit AL_FCHN3.xml directly or invent an XML repair.
Verification
After checking the release-matched configuration, rerun the relevant engineering compile and inspect the complete diagnostics. Confirm that the specific red_adr error is gone and that all safety-related compile checks, signatures and project validation steps required by the deployed process remain satisfied. A successful ordinary CFC compile alone is not sufficient evidence that the safety application is ready for download or operation.
Limitations and Operational Precautions
The actual attachment and full diagnostic context are unavailable, and web research did not locate an official Siemens document that maps this exact error string to a definitive cause. The listed configuration checks come from the thread reply and are not verified fixes. Technical review is required before using them to change any safety-related project.
Engineer FAQ
What does red_adr mean in this diagnostic? The exact meaning is not established by the available Siemens material; the article preserves the identifier but does not guess its internal interpretation.
Should I manually define red_adr in the XML file? No such repair is supported by the evidence. Do not edit generated XML based on the message alone.
What checks did the discussion suggest? Verify the F-module, its configured safety mode, symbolic F-DI addresses and F-channel driver connections, then confirm these against release-specific documentation.
Can I download after the diagnostic disappears? Not on that basis alone. Complete the safety project's required review, validation and change-control steps.
What information is needed to resolve the error? PCS 7/F-Systems versions, module order number, Hardware Configuration, symbol assignments, driver interconnections and the complete compile log.
Technical References
- Siemens, Compendium Part B – Process Safety (V9.1), official manual; current searchable edition includes information about F-channel drivers such as
F_CH_DI, but direct PDF access returned HTTP 403 and the source version is unknown: https://support.industry.siemens.com/cs/attachments/109809645/pcs7_compendium_part_b_en-US_en-US.pdf - Siemens, SIMATIC PCS 7 Process Safety (V10.0), current manual reference for F-channel driver concepts; not used to infer applicability to the unspecified source release: https://support.industry.siemens.com/cs/attachments/109990271/pcs7_compendium_part_b_en-US_en-US.pdf