Siemens SINUMERIK 840DE SL User Manual (English)

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Questions and Answers:

mitchelljenniferJul 25, 2025

What to do if all four LEDs on the Siemens Controller PLC flash (DI disaster)?

J
Joshua LarsonJul 25, 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.

Justin LeeAug 8, 2025

How to troubleshoot no MPI connection to Siemens Controller PLC?

A
Amanda CarrollAug 9, 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.

Siemens SINUMERIK 840DE SL Specifications

General

Application	High-end machine tools
User Interface	SINUMERIK Operate
Axis Capacity	Up to 31 axes
Safety Integrated	Yes
Relative Humidity	5% to 95% (non-condensing)
Control System	CNC
Type	SINUMERIK 840DE SL
Programming Languages	DIN 66025, ISO 6983, G-code
Communication Interfaces	Ethernet, PROFIBUS, PROFINET
Control Loops	Position, Speed, Current
PLC	Integrated SIMATIC S7-300 PLC
Data Storage	CompactFlash card, hard disk
Operating Temperature	0°C to 45°C
Spindle Capacity	Dependent on machine mechanics