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Siemens SINUMERIK HMI: operator panels, machine control panels, PCU and TCU
On a machine tool with a SINUMERIK CNC, the operator works every day with the operator interface: the panel with the screen, the CNC keyboard, the machine control panel and often a handheld unit. These components are the most exposed to wear, impacts and dirt, and when they fail the machine can no longer be operated even if the CNC and drives work.
The E-Repair catalogue covers about 450 part numbers for SINUMERIK HMI components.
⚙️ Operator interface components
- Operator panel fronts (OP): OP 010, OP 012, OP 015, OP 019, OP 030, OP 031, OP 032 and OP 032S, with displays of different sizes (for example 15" TFT on the OP 015) and membrane or touch keys.
- Complete CNC keyboards, separate or integrated in the front.
- Machine control panels: 19" Machine Control Panel (MCP) for milling machines and lathes and MPP 310 and MPP 483 panels connected via MPI or PROFIBUS DP.
- Handheld units such as HT 6 and HT 8 and their connection modules.
- PCU 20, PCU 50 and PCU 70: the industrial PCs that run the HMI software behind the panel.
- TCU (Thin Client Unit), used with more recent systems to connect panels to the CNC.
- Videolink, to carry the video signal to panels located far from the CNC.
🔍 Roots in the E-Repair catalogue
| Root | Main content | Part numbers |
| 6FC5203 | OP fronts, keyboards, Machine Control Panels | 174 |
| 6FC5303 | MPP panels, OP 015 and OP 019 fronts, handheld unit modules | 132 |
| 6FC5200 | Operator panels, also in packages for Transline lines | 64 |
| 6FC5210 | PCU 20, PCU 50, PCU 70 | 53 |
| 6FC5247 | Videolink, fronts and components for 840D | 81 |
| 6FC5312 | TCU 20 and TCU 30 | 15 |
👉 6FC5203-0AF03-0AA0 – OP 015 front, 15" display
👉 6FC5203-0AD10-0AA0 – 19" Machine Control Panel
👉 6FC5303-1AF00-0AA0 – MPP 483 panel
👉 Search the catalogue: 6FC5203 · 6FC5303 · 6FC5210
⚠️ Typical faults
- display with worn-out backlight or unstable image
- worn or unresponsive membrane keys
- worn push buttons, selectors and potentiometers on the machine control panel
- PCU disks at end of life, with loss of the HMI software
- faulty power supplies and video or bus connections
Before sending a PCU it is essential to save an image of its disk: it contains the HMI software and the machine customisations.
🛠️ E-Repair services for SINUMERIK HMI
As Approved Partner Siemens – Industry Services, E-Repair supports production continuity:
🔧 Component-level repair in E-Repair's certified in-house laboratory, with diagnosis and repair where technically feasible.
♻️ Refurbishment with replacement of components subject to ageing and functional testing according to the agreed scope of work.
🚚 Advance replacement with a refurbished or new product, if available in stock and after a compatibility check.
💾 Support in saving and restoring disk images, parameters and firmware.
🛠️ On-site and remote technical assistance for diagnosis and recommissioning.
✅ Standard 12-month warranty on the services for which it applies, extendable up to 24 months under the applicable conditions.
❓ Frequently asked questions
✔️ Can an OP front be repaired without changing the PCU?
Yes: front, keyboard, machine control panel and PCU are separate components and are repaired individually. The diagnosis shows which component is faulty.
✔️ Can a PCU be replaced with a more recent model?
Not always: the HMI software version and compatibility with the CNC must be checked. Repairing the original avoids reinstalling and reconfiguring.
✔️ What is needed before shipping?
The full part number from the rating plate, a description of the fault and, for PCUs, a backup image of the disk.
📚 Further reading
👉 SINUMERIK range, including 840D and 840D sl · 👉 6FC5 roots · 👉 SINUMERIK 840C, 850 and 880
ℹ️ The information provided is general and indicative. Before purchase, installation or commissioning, check the data against the official Siemens documentation or contact E-Repair.
