SI CU: STOP A initiated

What does 201600 mean?

This fault indicates that the drive-based Safety Integrated (SI) function in the Control Unit (CU) has detected an anomaly and initiated a STOP A, which involves pulse suppression via the safety shutdown path. This can be due to an unsuccessful forced checking procedure of the safety path, or a subsequent response to a monitoring channel defect (F01611). The fault value provides more detail, such as stop requests, pulse suppression issues, or feedback discrepancies. This safety-critical fault immediately inhibits motor operation to prevent hazardous situations.

• Detection of an internal safety fault within the Control Unit (CU) hardware or firmware (e.g., watchdog error, internal self-test failure).
• Discrepancy or failure in the safety input signals (e.g., STO, SLS) monitored by the CU (e.g., X150 terminals).
• Checksum error in the safety-relevant parameters of the CU after a download or firmware update.
• External safety device (e.g., safety light curtain, emergency stop button) wired to the CU's safety inputs (e.g., X150) has been activated.
• Failure of a safety-relevant component on the CU causing it to initiate a safe state.

Click steps to track your progress.

1. 1

   1. Identify the specific cause code associated with STOP A in the drive's diagnostic buffer (e.g., r0947, r949) to pinpoint the source.

2. 2

   2. Verify the status of all safety input signals (e.g., STO, SLS via terminals X150.1-X150.4) using a voltmeter to confirm their correct state.

3. 3

   3. Perform an online safety diagnostics check using the engineering tool (e.g., TIA Portal Safety Integrated Editor) to read detailed safety fault information.

4. 4

   4. Cycle power to the drive (main power off/on) to reset the Control Unit and observe if the fault persists immediately upon restart.

5. 5

   5. If the fault reoccurs without external cause, consider replacing the Control Unit as it indicates an internal hardware failure.