Resolving S7-1200 Error 0130:000002 Establish Communication

1. Problem Overview

The diagnostic event "ERROR ESTABLISH COMMUNICATION 0130:000002" is reported by the S7-1200 online subsystem when the TIA Portal project context cannot negotiate a valid online session with a SIMATIC CPU 1215C DC/DC/DC (order number 6ES7215-1AG40-0XB0) or a related 1215C variant. The dialog title Establish Communication is generated by the TIA Portal online handler before any project data is uploaded or downloaded; therefore the error code 0130:000002 is a transport / session error, not a program execution fault inside the CPU.

Typical user-visible symptoms:

• Right-click Online & Diagnostics on the configured device fails immediately.
• Right-click Go Online returns the same code and aborts the connection attempt.
• Using Online > Accessible Nodes / Load device as new station (hardware and software) discovers the CPU on the subnet, but Load aborts with "Action interrupted before charging the device".
• The CPU RUN/STOP/MAINT LEDs behave normally (no SF/DIAG blinking pattern that would indicate a CPU-internal fault).

The error is reported identically on TIA Portal V13 SP1, V15.1 and V16 when the CPU was last configured with a portal version that is incompatible with the active project — most commonly a newer TIA Portal version than the one being used for the recovery attempt.

2. Affected Hardware and Firmware

Refer to the official SIMATIC S7-1200 Programmable Controller System Manual (entry ID 109769499) for the complete MLFB / firmware map. The same 0130:000002 error is also documented for the 1211C, 1212C, 1214C and 1217C CPUs in the 6ES721x-1xx40-xXB0 family when the project-context mismatch is present.

3. Root Cause: TIA Portal and Firmware Version Conflict

The S7-1200 stores the project checksum, the configuration signature, and the TIA Portal version that produced the online project on the SIMATIC Memory Card or in load memory. When the CPU is powered up it validates this signature. If the signature cannot be parsed by the TIA Portal version you are using to connect, the online handshake is rejected with error 0130:000002.

The most common reproduction path:

1. A CPU is loaded with a project generated in TIA Portal V19 (or any version newer than the recovery tool).
2. A second engineer attempts to attach using TIA Portal V15.1 to read the program for troubleshooting.
3. V15.1 cannot decode the V19 configuration block; the online layer aborts and surfaces 0130:000002.

Secondary causes that produce the identical error string:

• Project was created against firmware V4.6 and the active TIA Portal only supports up to V4.4.
• Password / know-how protection on the CPU blocks is active and the password used at compile time is not provided.
• IP / PROFINET name conflict between the configured project and the scanned device.
• Corrupted load memory after a failed firmware update (hot-swap of the memory card during a write).
• PROFINET device name on the CPU was changed in the active project but never written to the device (a download guard is enforced).

4. Diagnostic Procedure

Follow this ordered procedure to isolate the version conflict before attempting any destructive operation (memory-card wipe, factory reset, firmware update).

4.1 Capture the Visible LED State

Record the state of RUN, STOP, MAINT, ERROR and LINK on the CPU. A constant MAINT LED with the ERROR LED flashing at 2 Hz indicates a configuration error consistent with a version-mismatch signature; this is purely a maintenance hint and is non-fatal.

4.2 Identify the CPU's Active Firmware

1. Open TIA Portal V15.1 or higher.
2. Expand Online & Diagnostics from the project tree.
3. From the Online access branch (not the project branch), locate the network adapter that is on the same subnet as the CPU.
4. Double-click Accessible nodes. The CPU will appear with its IP address, MAC, and PROFINET device name.
5. Right-click the device and select Online & Diagnostics. The Diagnostics landing page lists Module information > Firmware and Order number.

Note: this step only works if a basic PG/PC online session can be established. On a version-mismatched CPU the diagnostics page may still load because the page is read from the CPU's system data area, which is not gated by the project signature.

4.3 Identify the TIA Portal Version That Loaded the Project

Inside the same online diagnostic session, open the General tab of the CPU's Online & Diagnostics view. The field "Version of TIA Portal project" lists the TIA Portal build that produced the currently loaded configuration.

4.4 Capture the PLC Trace / Diagnostic Buffer

From Online & Diagnostics > Diagnostics buffer, export the entire buffer as a .txt file. Look for entries of class "Communication error" with event ID 0130:000002; the accompanying text will reference either "online interface" or "configuration signature". Save the buffer — Siemens Technical Support requires it for escalations.

5. Step-by-Step Recovery

Select the path that matches the firmware-to-TIA relationship you discovered in Section 4.

5.1 Path A — Recovery TIA Portal Is Older Than the Project

1. Confirm the version reported in "Version of TIA Portal project" (e.g., V19.0.0).
2. Install the matching TIA Portal version (or any version equal-or-newer than the CPU's project). For a V19 project, install TIA V19 from the Siemens TIA Portal V19 Download (entry ID 109976398) page.
3. Create a new empty project and add a CPU 1215C DC/DC/DC of the exact MLFB detected in Section 4.2.
4. Go to Online > Accessible nodes, select the CPU, and choose Upload device to PG/PC. The upload reads the project's hardware configuration and software blocks from load memory and reconstructs them in the new TIA project.
5. Save the project with a timestamped name; do not save over the original offline file.

5.2 Path B — CPU Firmware Is Newer Than Supported by the Active TIA

This occurs when a CPU is upgraded to FW 4.5 in the field but the engineering station still runs TIA V15.1. The online session aborts because V15.1 cannot interpret the V4.5 system data blocks.

1. Upgrade the engineering station to a TIA Portal version whose device-support package (HSP / support package) includes the required firmware. Use the HSP installation guide (entry ID 72341852) to add the matching HSP.
2. Open the new TIA Portal, create a project with the correct MLFB, and repeat Path A step 4.

5.3 Path C — Memory Card Read-Out via Card Reader

If the CPU is reachable but every TIA Portal version refuses the online session (for example, a corrupted signature after a brown-out), extract the program directly from the SIMATIC Memory Card.

1. Power down the CPU.
2. Remove the SIMATIC Memory Card (SMC) from the slot below the display cover.
3. Insert the SMC into a standard SD-card reader. The card contains a SIMATIC.S7S directory structure; copy the SIMATIC.S7S and FWUPDATE.S7S folders to a PC.
4. Insert the card into a known-good CPU of the same MLFB and FW version. Power on and use TIA Portal Upload device to PG/PC.

6. Firmware Update Procedure

If the firmware itself is suspected to be corrupt or below the version required by the TIA Portal project you must recover, perform an online firmware update before re-attempting the upload.

1. Open TIA Portal and go to Online & Diagnostics of the accessible CPU.
2. Select Update firmware from the navigation pane.
3. Browse to the *.upd file shipped with the S7-1200 HSP. The file name follows the pattern 6ES7215-1AG40-0XB0_V04.06.00_00.00.01.upd.
4. Check "Update firmware after download" and click Run.
5. Wait for the CPU to restart; the update takes 60–180 seconds for a 1215C.

For the official procedure, see the S7-1200 CPU firmware update (entry ID 77468940) article.

7. Factory Reset as Last Resort

A factory reset wipes load memory, the IP address, the PROFINET device name, the time-of-day, and the configuration signature. Use it only when the diagnostic buffer is consistent with a corrupt signature and a memory-card copy is unavailable.

1. Power off the CPU.
2. Insert a SIMATIC Memory Card that contains a S7_JOB.S7S file with the content RESET. The card is recognized during power-on and triggers a factory reset.
3. Power on the CPU; the RUN and MAINT LEDs blink alternately for 5–10 seconds while the wipe completes.
4. Power off, remove the SMC, and re-establish the online connection with the correct TIA Portal version.

8. Verification

After a successful recovery, perform the following checks:

1. Online & Diagnostics opens without error. Confirm "Version of TIA Portal project" now reflects the version of the TIA Portal you used to recover.
2. Compile the project (Station > Compile). A clean compile with zero errors confirms the project was reconstructed from valid blocks.
3. Compare offline / online. Right-click the CPU and choose Compare offline/online. The result must show "Identical" for hardware configuration and software blocks.
4. Watch table test. Create a watch table with one BOOL tag and toggle it in RUN. If the value changes, the online interface is fully functional.
5. Diagnostic buffer scan. Verify that no new 0130 events are appended after a 5-minute RUN period.

9. Troubleshooting Matrix

10. Prevention and Best Practices

• Pin the TIA Portal version per project. Always archive the offline project with the exact TIA Portal version used to create it. Use a versioned source-control system (Git + TIA Portal Openness) to record which TIA build last touched the program.
• Document the firmware at handoff. Add the firmware version to the project name or to a README inside the project archive.
• Restrict SMC hot-swap. Always power the CPU off before removing or inserting the SIMATIC Memory Card. Hot-swap is the single most common cause of corrupt project signatures.
• Run HSP updates centrally. Maintain a single engineering image with the latest HSP bundle installed; this prevents the case where a CPU is upgraded in the field and the engineering station no longer recognises it.
• Enable write-protection for production CPUs. Use Online & Diagnostics > Protection to set a CPU password and the Read-only access option after commissioning, reducing the chance of an accidental load that overwrites the running program.

11. FAQ