Siemens SINUMERIK 840D sl User Manual (English)

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Questions and Answers:

M
Mr. Ricardo KimJul 25, 2025
What to do if all four LEDs on the Siemens Controller PLC flash (DI disaster)?
- P
  Paul CurtisJul 26, 2025
  If all four LEDs on the Siemens Controller PLC are flashing, it indicates a system error. Here's what you should do: 1. Stop the PLC (set the "PLC" switch to position 2). 2. Perform a hardware reset. 3. Read the diagnostic buffer using STEP 7 to analyze the error in detail. 4. Relay the diagnostic buffer information to the Hotline / Development Service. 5. If requested after the hardware reset, perform a general reset. You can then read the diagnostic buffer with the PLC in the Stop state. Alternatively, resetting or reloading the PLC program might resolve the issue. Even if the system returns to normal, send the diagnostic buffer content to the Development Office.
R
ross86Jul 31, 2025
How to troubleshoot no MPI connection to Siemens Controller PLC?
- J
  James MezaJul 31, 2025
  If there is no connection via MPI to the Siemens Controller PLC, the MPI cable might not be plugged in or could be defective. Also, the STEP 7 software might not be correctly configured for the MPI card. To test, create a link with the programmer in the STEP 7 editor using the "Direct_PLC" connection. A number of node addresses should appear. If they don't, the MPI cable is likely defective or not plugged in.
W
wallermollyAug 6, 2025
What to do if all four LEDs on the Siemens Control Systems PLC flash?
- D
  Debbie WestAug 6, 2025
  If all four LEDs on your Siemens Control Systems PLC are flashing, it indicates a system error. To address this, halt the PLC (set the 'PLC' switch to position 2) and perform a hardware reset. Use STEP 7 to read the diagnostic buffer and share this information with the Hotline / Development Service. If requested after the hardware reset, perform a general reset. After resetting or reloading the PLC program, normal operation may resume. Still, send the diagnostic buffer content to the Development Office.
J
Jackie MillerAug 12, 2025
Why PLC cannot be accessed in Siemens Control Systems in spite of PLC general reset?
- D
  Deborah MillerAug 12, 2025
  If you cannot access the Siemens Control Systems PLC after a general reset, it might be due to a system data block SDB 0 loaded with a modified MPI address, causing an MPI bus conflict. To resolve this, disconnect all MPI cables from other components. Then, establish a 'Direct_PLC' connection with the programmer and correct the MPI address.
P
Paul CarterAug 18, 2025
How to troubleshoot no connection via MPI to PLC in Siemens Control Systems?
- D
  danielmillerAug 18, 2025
  If there's no connection to the PLC via MPI in your Siemens Control Systems, the MPI cable might be unplugged or defective, or the STEP 7 software may not be correctly configured for the MPI card. Test the connection by creating a link with the programmer in the STEP 7 editor using the 'Direct_PLC' connection. If no node addresses appear, the MPI cable is likely defective or not plugged in.

Siemens SINUMERIK 840D sl Specifications

General

Control Type	CNC
Number of Axes	Up to 31
Max Number of Channels	10
Interfaces	Ethernet, PROFIBUS, PROFINET, USB
Interpolation	5-axis interpolation
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Display	TFT color display, various sizes
Programming Languages	DIN/ISO
Safety Features	Safety Integrated
PLC	Integrated PLC S7-300
Drive Interface	SINAMICS S120
Data Storage	CF card, USB
Operating System	Windows-based