Troubleshoot CEMAT V8.1 C_MEASURE Error 1739:60451 on an Analog Input

The available report does not establish a verified cause or correction for system error 1739:60451 when connecting a CEMAT V8.1 C_MEASURE block to an analog-input card. It says the message is “wrong signal or no signal available” and that a PCS 7 AnAI block works with an analog input, but does not identify the CFC/CEMAT versions, block interface, I/O address, data type or connection being made. Do not substitute the AnAI wiring into C_MEASURE without checking its documented interface.

Information available

The reported environment is CEMAT V8.1, CFC V8.1 SP1 Update 2, and an AI card. Error 1739:60451 is accompanied by “wrong signal or no signal available.” The source has no replies and does not show the chart, module model, channel address or C_MEASURE parameter being connected.

Compare the block interfaces before changing the chart

CEMAT documentation distinguishes input modes for its measured-value block. In the cited CEMAT V8 system manual, the exact block interface and TYP determine whether a raw analog value is read from an input word or a physical/structured value is supplied. Confirm the exact CEMAT block type/version in the project and map the connected signal to the appropriate documented input; do not infer that an AnAI output and an address word are interchangeable.

Focused diagnostic checklist

Record the exact CEMAT block name and FB number, CEMAT library release/update and CFC release/update from the project.
Identify the AI module order number, channel, configured address and signal format from HW Config.
In the block's matching CEMAT manual, inspect the input-interface description and the mode/type selection for reading a raw card word versus a physical value.
Compare the live C_MEASURE connection with a known-working instance using the same library version and hardware/channel configuration. Check data type and address assignment at the connection point.
Inspect the full diagnostic text and CFC compile results. Do not change module-driver generation, force I/O or download a modification until the intended signal path is established.
Test any correction in an engineering copy or approved test system and verify the input value, quality/status and scaling against the configured AI range.

Why the working AnAI block is useful but not conclusive

A PCS 7 AnAI block working on the same signal suggests that the hardware/channel path may be available, but does not prove C_MEASURE expects the same interface, raw data representation or driver connection. Compare the blocks' documented input types and parameter modes instead of copying a wire or constant.

Verification

Confirm the exact input interface and selected mode in the version-matched manual, compile the test configuration and verify the resulting process value and status with a known safe input. Check raw and engineering-unit values separately. The source provides no confirmed result for error 1739:60451.

Limitations and Operational Precautions

The central error has not been independently documented for this exact CEMAT/CFC version combination, and the ticket has no follow-up. A CEMAT V8.0 manual is only adjacent evidence for V8.1; confirm interface details in the installed V8.1 library documentation. Do not download unverified signal changes to a live measurement loop.

Engineer FAQ

What is the reported error? 1739:60451, described as “wrong signal or no signal available.”

Does the source identify a fix? No; there are no replies.

Does AnAI working prove the card is configured correctly for C_MEASURE? No. The blocks may require different signal types or inputs.

What should be checked first? Match the block type/version, selected input mode, hardware address and data type to the CEMAT manual.

Can the CEMAT V8.0 manual be applied directly to V8.1? Not without verifying the exact library interface in the V8.1 project.

Technical References

Siemens, CEMAT V8 System Reference Manual, measured-value block input types and signal selection: https://cache.industry.siemens.com/dl/files/523/64877523/att_42251/v1/Cem_V8_System_000_en.pdf
Siemens, CEMAT V8.2 Engineering Manual, CEMAT measurement block configuration context: https://support.industry.siemens.com/cs/attachments/109745917/Cem_V82_Engineering_001_en.pdf