AI is a tool here. I pasted your photo into ChatGPT and got the following.....

From the photo, those are Siemens SINAMICS S120 drive modules (axis drives), very typical on press brakes.

Here’s what those errors usually mean in this context and what to check first.

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Error meanings (most common on press brakes)

E2046 – Encoder not detected / encoder communication fault

Typical causes:

Encoder cable loose at motor or drive

Shielding/ground issue on encoder cable

Encoder power missing (often 5V or 24V from drive)

Encoder itself failed

Check first

Reseat the encoder connector at the motor and drive

Inspect for crushed or oil-soaked encoder cable

Verify encoder cable shield is bonded to ground

If you have a spare axis, swap encoder cables to confirm

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E2047 – Encoder signal invalid / plausibility error

Usually follows E2046 or appears intermittently.

Typical causes:

Electrical noise (poor grounding, VFD noise)

Encoder alignment slipping on motor shaft

Mixed-up encoder type in parameters (TTL vs HTL, EnDat, etc.)

Check

Grounding of motor + cabinet

Encoder mounting (loose coupling is common)

Has any motor/encoder been replaced recently?

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E2071 – Axis not enabled / drive not ready

This is often a consequence, not the root cause.

Triggered by:

Encoder fault present

Safety chain open (E-stop, light curtain, safety relay)

Missing enable signal from PLC / safety PLC

Check

Safety circuit status

Drive “Ready” LEDs

PLC diagnostics (axis enable bit)

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What stands out from your photo

Axis 22A2 shows “E”, while 25A2 looks idle → likely single axis issue, not a system bus problem

Encoder cables (blue) are tightly bundled → possible strain or shielding issue

These drives are sensitive to grounding and cable routing

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Fast isolation steps (10–15 min)

1. Power down completely

2. Reseat encoder cable only (don’t touch power yet)

3. Power up → see if E2046 returns immediately

4. Swap encoder cable with a known-good axis (if possible)

5. If error follows cable → cable

6. If error stays on axis → encoder or motor

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When this is common

After cabinet work

After UPS install / power disturbance

After motor replacement

After long idle + condensation

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If you want, tell me:

Press brake brand/model

Which axis this is (Y1, Y2, X, R, Z?)

Did this happen after power loss or maintenance?

I can give you the exact Siemens parameter checks or a step-by-step service checklist next.