The Siemens 6SL3255-0AA00-4JA2 is the SINAMICS Intelligent Operator Panel 2 (IOP-2)—a compact, rugged local HMI designed for commissioning, operation, and diagnostics of SINAMICS G-series drives. Instead of dragging a laptop to every cabinet door (and then negotiating with dust, glare, and that one missing USB cable), the IOP-2 gives you a practical “at-the-drive” interface: clear status information, guided setup menus, parameter access, and local control functions that are genuinely useful in the field.
At a product level, Siemens positions this IOP-2 specifically for SINAMICS G120 / G120P / G110M / G110D / G120D / G120C / ET 200pro FC-2, with a wide set of built-in language options including Simplified Chinese.The result is a universal operator interface that works well for machine builders and maintenance teams who need consistent workflows across multiple plants, regions, or OEM machine platforms.
Why an operator panel matters in real installations
Drives are not configured once and forgotten. During machine build, you commission; during ramp-up, you tune; during production, you troubleshoot; during maintenance, you replace a motor or a control unit and need to reload settings fast. The IOP-2 is built for exactly that lifecycle.
It supports a structured approach to setup: the operating instructions describe configuration areas like Motor Data, Limit Settings, I/O Setup (with macro-based pre-assignment), Fieldbus Setup, and application-specific functions. This is important because it keeps common work aligned with how people actually commission drives: start with motor nameplate data and control mode, then move to limits, then I/O and comms, then the application layer.
Core specifications at a glance
| Item | Specification | Value / Notes |
|---|---|---|
| Manufacturer / Series | Siemens / SINAMICS | IOP-2 for SINAMICS G drives |
| Part Number | 6SL3255-0AA00-4JA2 | Market-facing article number |
| Display type | LCD color | Listed in the Siemens technical data sheet |
| Resolution | 320 × 240 pixels | Clear, readable for status + parameter work |
| Protection rating | IP55 / UL Type 12 | Suitable for industrial environments |
| Dimensions (W×H×D) | 70.0 × 106.85 × 19.65 mm | Compact footprint |
| Operating temperature | 0…50 °C | Up to 55 °C with door installation kit |
| Storage / transport temperature | −40…70 °C | For typical industrial logistics |
| Humidity | Up to 95% (max operation) | At 25 °C condition in datasheet |
| Approvals | CE, cULus, EAC, KCC, RCM | Global acceptance support |
| Net weight | 0.160 kg | Datasheet vs. Industry Mall listing can differ |
Compatibility and connection notes
The IOP-2 is broadly compatible across SINAMICS G families, but the connection method can differ depending on the drive/control unit.
| Drive family / unit | IOP-2 usage | Notes |
|---|---|---|
| SINAMICS G120 / G120P / G120C | Direct local operation | Listed as supported targets for IOP-2 |
| SINAMICS ET 200pro FC-2 / G110D / G110M | Supported, may require Hand-Held Kit | Some control units require a kit to connect |
| Hand-Held Kit reference | 6SL3255-0AA00-4HA1 | Mentioned in the operating instructions |
That last point is a practical win: even when you can’t mount the panel directly on a specific unit, the Siemens ecosystem provides a defined accessory path (hand-held kit) rather than forcing an improvised solution.
Operational features that technicians actually use
Beyond “it has a screen,” the IOP-2 is designed to reduce downtime and speed up safe checks.
One standout is the Control menu, which the manual describes as allowing real-time changes such as setpoint, reverse, jog, custom hand mode, startup in hand mode, and hand/auto behavior.That’s not just convenience—those functions help verify rotation direction, test conveyors at low speed, and confirm basic I/O interlocks before you hand control to PLC logic.
The manual also explains Custom Hand mode, where command source and setpoint source can be configured directly from the IOP-2; it even notes that the IOP-2 Sensor Control Field can be used as the setpoint source once configured. In other words: you can perform controlled local testing without rewriting PLC code or reworking fieldbus configuration first—useful during commissioning and troubleshooting, provided your safety concept and procedures are correct.
Parameter handling is another area where the IOP-2 shines. The operating instructions describe structured parameter access, including searching by number and maintaining a “My Parameters” list for frequently used parameters, plus saving and handling configuration data. For maintenance teams, that means less time scrolling through massive parameter trees and more time solving the actual problem.
Example commissioning workflow with IOP-2
| Step | What you do on the IOP-2 | Why it matters |
|---|---|---|
| 1 | Verify drive status and alarms |
Establish a clean baseline before changing parameters |
| 2 | Enter motor data and control type |
Correct motor data enables stable control behavior |
| 3 | Configure limit and optimization settings |
Prevent nuisance trips and improve response |
| 4 | Assign I/O using macros, then adjust if needed |
Fast setup with predictable wiring behavior |
| 5 | Set fieldbus interface parameters |
Align the drive with your PLC/network design |
| 6 | Perform controlled jog/hand checks |
Validate direction and mechanics before Auto mode |
Logistics and compliance notes for purchasing teams
On Siemens Industry Mall, the product is shown as an active item and includes standard procurement identifiers such as EAN 4042948673836, plus export control notes (AL: N / ECCN: N).
The listing also includes country of origin: Great Britain and RoHS compliance history.
For some compliance workflows, it is also relevant that the same page contains a REACH Article 33 disclosure referencing lead-related substances in certain concentrations.
Summary
If you are building or maintaining SINAMICS G-series drive systems, the Siemens 6SL3255-0AA00-4JA2 IOP-2 is a high-leverage accessory: compact, IP-rated, multilingual, and built around the everyday tasks of commissioning and troubleshooting. It provides a color LCD interface (320×240), local control options (including jog and hand/auto behaviors), structured parameter access, and defined compatibility across major SINAMICS G families—with clear Siemens documentation for scenarios where a hand-held connection method is required.
