Siemens 16#0002: Siemens S7-1500 Error Code 16#0002

Symptoms

The SF LED flashes red. The CPU remains in STOP mode and cannot be switched to RUN. A firmware update or repair is indicated in the diagnostic buffer.

Possible Causes

Firmware update was interrupted or failed to complete
Corrupt firmware image on the memory card
Insufficient power during firmware write operation
Incompatible firmware version with the hardware revision

Troubleshooting Steps

Step 1: Check the TIA Portal diagnostic buffer for firmware-related entries
Confirm whether a firmware update was in progress and where it failed
Step 2: Attempt to re-flash the firmware using a known-good image file on the memory card
Firmware update completes successfully without interruption
Step 3: Ensure stable 24V DC power supply throughout the firmware update process
No voltage dips or interruptions during the write cycle
Step 4: If re-flashing fails, replace the memory card and retry
Firmware update completes with a new memory card

How to Reset

To reset: 1) Power off the CPU. 2) Remove and reinsert the memory card with a valid firmware image. 3) Power on the CPU and wait for the firmware to load. 4) If the update was completed, clear the diagnostic buffer and switch to RUN mode. Caution: Do not power off during a firmware update.

Common Replacement Parts

6ES7954-8LP02-00AA0: SIMATIC Memory Card 4MB (Required for firmware updates and data storage)

Frequently Asked Questions

Q: Why did the firmware update fail?
The most common cause is an interrupted power supply during the write cycle, or an incompatible firmware version for the hardware revision.
Q: How do I fix a corrupted firmware image?
Replace the memory card with a new one containing a verified firmware image, then retry the update with stable power.

Siemens S7-1500 Error Code 16#0002