Troubleshoot Grey PA Instruments in PCS 7 V9.0 SP3 HW Config
If PA instruments appear grey in the online hardware view of PCS 7 V9.0 SP3, obtain the actual STEP 7 module diagnostics before declaring them healthy or faulty. Grey appearance and continuing WinCC values do not establish the cause. In this configuration the image needed to identify the exact display state is unavailable, so the defensible next action is the documented online diagnostic workflow, followed by comparison with the hardware-configuration baseline.
Table of Contents
- Symptoms and Evidence
- Inspect the Online Diagnostic View
- Compare the Change with the Baseline
- Verification
- Limitations and Operational Precautions
- Engineer FAQ
- Technical References
- Related Articles
- Related Tags
Symptoms and Evidence
In the reported PCS 7 V9.0 SP3 commissioning configuration, PA instruments and FDC components appear grey in the online hardware view after installing a GSD for a P420 pressure instrument, replacing instrument configurations and downloading. WinCC continues to show process values.
The referenced screenshot is unavailable. Consequently, the exact symbol, its overlay and any associated diagnostic message cannot be identified. The timing of a GSD installation is evidence to record, not proof that the GSD caused the display.
Inspect the Online Diagnostic View
Siemens documents the following STEP 7 diagnostic procedure in sections 23.4–23.5:
- In SIMATIC Manager, open the affected station and its Hardware object.
- Select Station > Open Online.
- Locate the affected instrument or its accessible upstream component. Double-click the module to obtain its available diagnostic details.
- For the CPU, inspect the diagnostic buffer and preserve events associated with the configuration change.
- Refresh the active view with View > Update or F5; refresh module information with its Update button where available.
Diagnostic content depends on the module and access context. Compare the displayed symbol with the installed online help rather than interpreting grey colour alone. Siemens distinguishes faults, configuration mismatches and unavailable diagnostic information.
Compare the Change with the Baseline
The following is an engineering investigation, not a verified repair for this symptom:
- Preserve the current project and the pre-change backup.
- Record which GSD and instrument object changed, including the actual device identity and configured module structure.
- Compare the affected network objects with the baseline and note whether unrelated devices changed appearance at the same time.
- Correlate the CPU events, online module details and process-value observations with the download.
- Decide on a corrective change only after the discrepancy has been identified.
Do not repeat downloads as a diagnostic substitute. A proposed correction should name the verified mismatch and the expected observable improvement.
Verification
A useful diagnostic outcome includes the exact online symbol, its documented meaning, current module information and relevant CPU events. Check that the online path reaches the intended station.
For process-value verification, observe a legitimate process change or an approved test condition and inspect the relevant quality indication. A displayed number alone does not establish that every device diagnostic path is healthy. No forced signals or production manipulations are required merely to capture the initial evidence.
Limitations and Operational Precautions
The explanation that the devices are healthy because only the background is grey cannot be confirmed without the missing image and diagnostics. No corrective procedure or successful recovery was established.
The cited STEP 7 manual documents the diagnostic tools; it does not certify a particular P420 GSD or the exact installed PCS 7 component combination. Preserve working process communication while investigating. Any hardware-configuration change or rollback needs a reviewed project backup and an operational plan for its controller and field-device consequences.
Engineer FAQ
Is grey a sufficient fault diagnosis?
No. Identify the symbol and read the associated diagnostics.
Does continuing WinCC operation prove the configuration is correct?
It is useful evidence, but does not resolve the missing hardware diagnostic information.
Should the GSD be removed immediately?
No verified evidence supports that correction here.
Technical References
- Siemens: Programming with STEP 7, April 2017, A5E41552389-AA — sections 23.2–23.5, diagnostic symbols, diagnostic view and Module Information.