Siemens 6SL3255-0AA00-4CA1 — G120 BOP-2 Operator Panel Buying Guide

By Abdullah Zahid
12 min read
Siemens 6SL3255-0AA00-4CA1 BOP-2 basic operator panel for SINAMICS G120 drive commissioning

Siemens 6SL3255-0AA00-4CA1 SINAMICS G120 Basic Operator Panel (BOP-2): Specifications, Compatibility, and Procurement Guide

Controls engineers specifying local commissioning interfaces for SINAMICS G120 drives are typically deciding between a full HMI, a PC-based tool, and a dedicated operator panel — and the 6SL3255-0AA00-4CA1 BOP-2 is the answer when cost, simplicity, and enclosure fit are the deciding factors. The Siemens 6SL3255-0AA00-4CA1 is the SINAMICS G120 Basic Operator Panel (BOP-2): a compact, monochrome 2-line LCD panel rated IP55 / UL Type 12, dimensioned at 70 x 106.85 x 19.6 mm, and compatible with G120, G120C, G120P, and G120X drives without additional adapters. It has been an active product since its 08/23/2010 delivery release and holds CE, cULus, EAC, KCC, and RCM certifications for global deployment.

If you have already confirmed this is the right panel for your G120 drive, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the 6SL3255-0AA00-4CA1 BOP-2 — and Who Shouldn't

The BOP-2 is the right choice for engineers and technicians who need a practical, low-cost local interface for SINAMICS G120 drive commissioning and parameter adjustment without deploying a PC or full HMI. This panel fits your project if all of the following apply:

  • Your drive is a SINAMICS G120, G120C, G120P, or G120X — not a G110, G140, or G150
  • Your control cabinet has a minimum 70 mm wide cutout available for flush or surface mounting
  • Ambient operating temperature in the installation environment stays within 0 to 50 degrees Celsius continuously
  • An IP55 / UL Type 12 enclosure rating is sufficient for your target environment (splash and dust resistant)
  • Local wired commissioning is acceptable — remote or wireless operation is not required
  • A 24 VDC control power supply is available at the cabinet

If wireless remote operation is required, the KTP Mobile Panel is the correct choice. If you need multi-drive coordination, process visualization, or long-term data logging, a full HMI touchpanel is the appropriate platform. If the integrated display on your G120 control unit is sufficient, the BOP-2 may be unnecessary overhead.

On this page:

What the BOP-2 Actually Does in a G120 Drive System

The Siemens 6SL3255-0AA00-4CA1 serves as the local control and commissioning interface between the technician and the SINAMICS G120 frequency converter. Rather than requiring a laptop running STARTER or Startdrive software, the BOP-2 provides menu-driven parameter access directly through a 2-line monochrome LCD display. A plant engineer or controls technician can set motor speed setpoints, adjust acceleration and deceleration ramps, reset faults, and toggle between manual and automatic mode — all from the panel face without opening a software environment.

The BOP-2 is not a monitoring or visualization tool. It does not log data, display trends, or support multi-drive management. Its role is focused: get a G120 drive commissioned and configured correctly, quickly, with minimal tooling. For maintenance teams that need a backup control method when the main network interface or PC is unavailable, the BOP-2 provides exactly that coverage. The single SKU — 6SL3255-0AA00-4CA1 — covers all four G120 variants, which simplifies spare parts inventory for facilities running mixed G120 fleets across multiple production lines.

Typical System Architecture: Where the BOP-2 Sits in Your Drive Panel

The 6SL3255-0AA00-4CA1 mounts at the human interface layer of a SINAMICS G120 drive system, receiving 24 VDC control power and communicating directly with the drive control unit below it in the signal chain. Here is where it fits in a typical installation:

  • 24 VDC control power supply feeds the BOP-2 through an external fuse or circuit breaker (external protection is required — the panel has no internal overcurrent device)
  • BOP-2 connects to the SINAMICS G120 control unit via the drive's designated operator panel port
  • G120 control unit manages motor output, safety interlocks, and fieldbus communication to the plant network (PROFIBUS, PROFINET, or analog — depending on drive configuration)
  • Motor load (pump, fan, conveyor, compressor) is controlled downstream by the G120 power module
  • During commissioning, the BOP-2 is the primary operator interface; in production, it may remain mounted as a local backup or be removed once software-based commissioning is complete

Industries and Applications Where the BOP-2 Delivers Real Value

In manufacturing environments — conveyors, pumps, fans, and compressors — the BOP-2 is the go-to commissioning tool when an on-site technician needs to bring a new G120 drive online without carrying a laptop to the cabinet. The compact 70 mm width fits existing operator panel cutouts in most standard industrial enclosures, making it practical for retrofits on lines where adding a full HMI would require a cabinet redesign.

Water and wastewater treatment facilities regularly deploy BOP-2 panels on pump station drives where remote HMI access exists for normal operations but a local panel is required for maintenance override and fault acknowledgment. The IP55 / UL Type 12 rating handles the humidity and washdown exposure typical in these environments.

HVAC system integrators use the BOP-2 during building commissioning to set fan speed limits, configure soft-start ramps, and verify safety interlock responses before handing over to the building management system. Once BMS integration is validated, the BOP-2 remains in place as a local override interface.

In food and beverage and pharmaceutical facilities, the BOP-2 supports quick parameter changes during production runtime — adjusting speed setpoints or ramp rates without halting the process — which is a recurring need during product changeovers.

Application Typical Deployment
Manufacturing conveyor and pump commissioning Local startup and parameter setting for new G120 drives; technician on-site without PC
Water and wastewater pump stations Maintenance override and fault reset at local panel; IP55 rating handles humid environments
HVAC fan and air handling units Building commissioning parameter setup before BMS handover; local backup control retained
Food and beverage production lines Quick speed and ramp adjustments during product changeovers without stopping the drive
Mining and mineral processing On-site drive commissioning in remote locations where PC-based tools are impractical
Backup control during network failures Local manual operation when PROFIBUS or PROFINET interface to plant network is unavailable

Key Specifications: What Engineers Need to Know Before Ordering

Specification Value
Display Type Monochrome LCD, 2-line
Width 70 mm (2.76 in)
Height 106.85 mm (4.21 in)
Depth 19.6 mm (0.77 in)
Weight 0.14 kg (0.31 lb)
IP / NEMA Rating IP55 / UL Type 12
Operating Temperature 0 to 50 degrees Celsius (32 to 122 degrees Fahrenheit)
Storage Temperature -40 to 70 degrees Celsius (-40 to 158 degrees Fahrenheit)
Maximum Humidity 95% at 25 degrees Celsius (non-condensing)
Compatible Drive Families SINAMICS G120, G120C, G120P, G120X

Full technical specifications are available on the product page at LeadTime.ca.

BOP-2 vs. KTP Mobile vs. Full HMI: Which Interface Do You Actually Need?

Feature BOP-2 (6SL3255-0AA00-4CA1) KTP Mobile Panel Full HMI Touchpanel Integrated Drive Display
Cost Tier $ $$ $$$ $
Commissioning Method Local wired Wireless remote Full PC integration On-drive limited
Display Type 2-line monochrome LCD Mobile app on tablet or phone Color touchscreen 7 to 15 in Small LED or LCD on drive
Multi-Drive Support Single G120 drive Multiple if networked Yes, unlimited Drive only
Long-Term Monitoring No Yes Yes (with data logging) Temporary only
Typical Use On-site startup and parameter setting Remote troubleshooting Factory or central station Emergency or manual override
Learning Curve Low — technician familiar Medium Medium to high Low — drive controls only

If your application requires local wired commissioning of a single G120 drive with a low-cost, cabinet-mountable interface, the 6SL3255-0AA00-4CA1 is the correct choice — check current availability at LeadTime.ca.

Expert Verdict: Honest Assessment for Procurement and Engineering Teams

The 6SL3255-0AA00-4CA1 earns its place in a G120 drive panel as a cost-effective, purpose-confirmed commissioning and local control interface. The IP55 / UL Type 12 rating is meaningful — this is not a bare laboratory panel, it belongs in industrial cabinets exposed to washdowns, dust, and coolant mist. The 70 mm width fits tight enclosures without forcing a cabinet redesign, and the fact that one SKU covers G120, G120C, G120P, and G120X reduces the procurement complexity for integrators managing multiple drive variants across different projects. With a delivery release documented as 08/23/2010 and active status confirmed as of 2025, this is a mature product with a long field track record and stable firmware base — not a component that will surprise you at installation.

Where the BOP-2 has real limits: it does not support remote or wireless operation, it cannot log data or display trends, and it manages only a single drive at a time. If your system requires monitoring multiple G120 drives from a central station, or if your maintenance team operates at a distance from the drive cabinet, the BOP-2 will not cover those needs. Do not over-specify a full HMI if local commissioning is all you need, but do not under-specify with a BOP-2 if ongoing process visibility is part of the actual requirement. Also critical: the BOP-2 has no internal circuit protection — an external 24 VDC fuse or breaker must be in the design, and this is a detail that gets missed on rushed panel builds.

From a procurement standpoint, the 6SL3255-0AA00-4CA1 is an active, single-SKU product with no configuration variants, which simplifies ordering. Lead times for standard orders typically run 4 to 8 weeks. Volume pricing is available for OEM quantities over 100 units annually, and bundled pricing may apply when purchased alongside G120 drive packages. If you need to confirm stock or lock in a quote before committing to a build schedule, view current stock and pricing at LeadTime.ca.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring, Mounting, and Installation Overview

  • Cabinet cutout must be a minimum of 70 mm wide x 106.85 mm high; deburr edges before inserting the panel to protect the bezel and seal
  • Secure the BOP-2 using the mounting clips provided on the rear; verify no gaps between the panel bezel and the cabinet face plate to maintain IP55 integrity
  • Connect 24 VDC control power through the panel's power connector; always de-energize and lock out the 24 VDC circuit before connecting or disconnecting the panel
  • Install external circuit protection — a fuse or breaker — in the 24 VDC supply line; the BOP-2 has no internal overcurrent device and one must be included in the electrical design
  • Route the signal cable from the G120 drive control port to the panel connector using the pin-out defined in the drive-specific manual; follow Siemens EMC guidelines for cable routing and shielding within the same cabinet

Commissioning and Parameter Access: What to Expect at First Power-Up

  • After energizing the 24 VDC supply, the drive should recognize the BOP-2 and the main menu should appear on the 2-line LCD within a few seconds — a blank or unresponsive display indicates a supply or connection issue to check before proceeding
  • Use the arrow keys to navigate through parameter groups (Motor, Speed, Protection, and others depending on G120 firmware version) and the Enter key to select or modify values
  • Motor speed setpoint, acceleration ramp, and deceleration ramp are the most common initial parameters to set; confirm that the parameter is not in a read-only state before attempting to write a value
  • After setting initial parameters, perform a low-speed soft-start test to verify drive response before running at full load
  • Document all commissioned parameter values in a commissioning log — the BOP-2 does not store a history, and records must be maintained externally for future maintenance reference

Certifications and Global Compliance

The 6SL3255-0AA00-4CA1 holds five regional certifications, allowing deployment in industrial facilities across North America, Europe, Asia, and the Pacific without requiring re-certification or alternate product variants.

Certification Scope Region
CE European Union compliance EU
cULus Canada and United States safety North America
EAC Eurasian Economic Union Russia, Kazakhstan, Belarus
KCC Korea Communications Commission South Korea
RCM Regulatory Compliance Mark Australia and New Zealand

Wrong-Part Prevention Checklist Before You Order

Before placing an order for the 6SL3255-0AA00-4CA1, work through every item on this checklist — each one represents a real ordering mistake that results in a non-compatible part arriving on-site:

  1. Confirm SINAMICS drive model is G120, G120C, G120P, or G120X (not G110, G140, or other families)
  2. Verify that existing panel cutout or mounting surface is 70 mm wide minimum
  3. Check that operating environment is not below 0 degrees Celsius or above 50 degrees Celsius continuously
  4. Confirm IP55 rating meets enclosure requirement (not IP20 or bare panel mounting)
  5. Ensure 24 VDC power supply is available at control cabinet
  6. Verify firmware release date of your drive (datasheet shows delivery release 08/23/2010; newer drives may require compatibility check)
  7. Check that firmware language pack supports your required menu language
  8. Confirm commissioning engineer has BOP-2 quick-start guide for your specific G120 firmware version

If any item on this checklist cannot be confirmed, contact the LeadTime.ca team before ordering — we can help verify compatibility against your drive model and firmware version.

Frequently Asked Questions

Is the 6SL3255-0AA00-4CA1 compatible with the SINAMICS G120C compact drive?

Yes. The 6SL3255-0AA00-4CA1 BOP-2 is fully compatible with the G120C. The single SKU covers G120, G120C, G120P, and G120X without requiring any additional adapters or variant selection. It is not compatible with G110, G140, or G150 drives, which require separate operator interfaces.

Does the BOP-2 require an external 24 VDC power supply, or does it draw power from the drive?

The BOP-2 requires 24 VDC control power to be available at the control cabinet. It does not generate its own supply. External circuit protection — a fuse or circuit breaker — must be installed in the 24 VDC supply line, as the BOP-2 has no internal overcurrent protection device. Refer to the G120 system engineering guide for circuit sizing details specific to your drive model.

Can the BOP-2 be used to commission multiple G120 drives simultaneously?

No. The 6SL3255-0AA00-4CA1 interfaces with a single G120 drive at a time. If your system requires managing multiple drives from one interface — or centralized monitoring and data logging — a full HMI touchpanel with appropriate network integration is the correct platform. The KTP Mobile Panel supports multiple drives if they are networked, but it is a wireless remote interface rather than a permanent panel-mount installation.

What is the operating temperature range, and can the BOP-2 be mounted in an outdoor enclosure?

The rated operating temperature range is 0 to 50 degrees Celsius. Outdoor mounting is only appropriate if the enclosure maintains that temperature range continuously and protects the panel to at least IP55. Direct sunlight exposure can cause the enclosure interior to exceed 50 degrees Celsius even in moderate climates, so thermal management must be considered before specifying an outdoor installation.

Is the 6SL3255-0AA00-4CA1 still an active product in the Siemens portfolio?

Yes. The 6SL3255-0AA00-4CA1 is confirmed as an active product as of 2025, with an original delivery release date of 08/23/2010. This indicates a mature product with over 15 years of field deployment and a stable firmware base. Availability varies by distributor and region — check current stock status at LeadTime.ca for real-time information.

What happens if the BOP-2 display is blank after power-up?

A blank display at power-up indicates either that the 24 VDC supply is not reaching the panel, that the drive itself has a startup fault preventing communication, or that the connector has loose contacts or corrosion. Verify the supply voltage at the cabinet with a multimeter, check the drive for active fault codes on its own display, and inspect the connector seating before assuming the panel is faulty.

Why Order from LeadTime.ca

  • LeadTime.ca ships worldwide — North America, EU, Asia-Pacific, and beyond — with no geographic restrictions on orders
  • Industrial automation parts including active and hard-to-source Siemens catalog numbers are stocked and sourced through verified channels
  • Volume pricing and bundled quotes available for OEM integrators and multi-facility procurement teams
  • Direct technical inquiry line for compatibility questions, lead time confirmation, and expedite requests before you commit to a project schedule

At-a-Glance Summary

  • Catalog number: 6SL3255-0AA00-4CA1 — single SKU, no configuration variants required
  • Official product name: SINAMICS G120 Basic Operator Panel (BOP-2)
  • Compatible drives: SINAMICS G120, G120C, G120P, G120X only — not compatible with G110, G140, or G150
  • Display: 2-line monochrome LCD for menu-driven parameter access without a PC
  • Dimensions: 70 mm W x 106.85 mm H x 19.6 mm D; weight 0.14 kg
  • Enclosure rating: IP55 / UL Type 12 — suitable for industrial environments with splash and dust exposure
  • Operating temperature: 0 to 50 degrees Celsius; storage: -40 to 70 degrees Celsius
  • Maximum humidity: 95% at 25 degrees Celsius, non-condensing
  • Power requirement: 24 VDC from cabinet supply — external circuit protection required (no internal fuse or breaker)
  • Certifications: CE, cULus, EAC, KCC, RCM — clears import requirements across North America, EU, Eurasian Union, South Korea, and Australia/New Zealand
  • Active product as of 2025; delivery release 08/23/2010; 15+ years of field deployment history
  • Typical lead time: 4 to 8 weeks for standard orders; volume pricing available for OEM quantities over 100 units per year