SIMATIC HMI Panel Identification Guide

Why Precise HMI Panel Identification Matters

A Siemens SIMATIC HMI panel sits at the operator interface of a machine, and the family, generation, and interface set vary widely across the range. Two devices that look almost identical from the front can carry different processors, mounting cut-outs, and connector layouts. When you source a spare, ordering the wrong model means a panel that will not fit the enclosure or talk to the controller. This guide walks through how to read the order number, tell the panel families apart, and gather the details needed for a clean, model-specific inquiry.

The single most reliable identifier is the full Siemens order number, also called the MLFB. Everything else — screen size, colour, physical dimensions — narrows the field, but only the complete order number pins down one device. Start there whenever the rating label is legible.

Reading the 6AV Order Number

Every SIMATIC HMI product carries an order number beginning with the prefix 6AV. That prefix marks the article as belonging to Siemens' operator-interface and visualisation product class. The characters that follow encode the family, the display, and configuration options, but you should treat the full string as a single lookup key rather than decoding each segment yourself.

A practical way to work with a 6AV number:

1. Copy the complete string exactly as printed, including every digit and letter, for example 6AV2108-0CF00-0BB0.
2. Confirm the prefix reads 6AV, which tells you it is an HMI or visualisation article rather than a controller or I/O module.
3. Note the block that follows the prefix, since Siemens groups panel families under recurring number ranges — the 6AV2 series covers current-generation panels, while 6AV7 numbers such as 6AV7674-1la42-0aa0 point to Panel PC hardware.
4. Record any trailing block, which typically reflects a configuration or hardware option and must be matched exactly.
5. Cross-check the number against the printed model name on the same label before you rely on it.

Because a single wrong character can point to a different device, always verify the string against the physical label rather than transcribing from memory. Related part-number reading habits are covered in the general part-number identification guide.

Telling the Panel Families Apart

SIMATIC HMI spans several families, each aimed at a different level of machine complexity:

• Basic Panels — entry-level touch or key devices for straightforward machine visualisation, listed under 6AV2123 and neighbouring ranges.
• Comfort Panels — the mid-to-high performance touch line, widely deployed on production machinery; devices such as 6AV2133-4bf00-0aa0 sit here.
• Mobile and specialty Panels — handheld and cabinet-door variants for operators who move around a line.
• Panel PC and industrial PC units — full PC-based operator stations, with 6AV7 order numbers like 6AV7674-1la32-0aa0 covering that segment.

Identifying the family first removes most of the guesswork. A Comfort Panel and a Basic Panel of the same nominal screen size are different devices with different cut-outs and firmware, so never treat the diagonal measurement alone as enough. If you are unsure which family a device belongs to, the printed model line on the rating label usually names it directly.

Identifying by Screen Size and Interface

Within a family, the display diagonal is the next dimension that separates models. Siemens panels are offered in a ladder of sizes — commonly around 4, 7, 9, 12, 15, and larger inches — and each size is a distinct order number. Measure the active display area, not the bezel, and treat that figure as a filter rather than a final answer.

Interfaces are the second discriminator. Look at the rear of the panel and record which ports are present: PROFINET and Ethernet connectors, PROFIBUS, USB host and device ports, and RS-422/485 serial. A 7-inch Comfort Panel with a single Ethernet port serves different network needs than one built around a dual-port switch, and those variants map to separate order numbers. Model-specific units such as 6AV2108-0ch00-0bb0 and 6AV2108-0df00-0bb0 illustrate how closely related listings within one range still resolve to distinct hardware.

Confirming Generation and Configuration

Siemens has revised its panel lines across several generations, and successive versions often share a form factor while differing in processor, memory, and firmware baseline. The order number is what distinguishes them, which is why reading the label rather than judging by appearance is essential. If your machine's engineering project references a specific device configuration, that reference is a second documented source you can match against the physical unit.

When the rear label has faded or been removed, useful fallback evidence includes the machine's electrical drawings, the TIA Portal or WinCC project that addresses the panel, and any maintenance records that name the device. Bring these together so the model you request is a like-for-like match to what the machine was engineered around. Panels intended as full PC stations, listed on the catalog under the Panel PC range, warrant particular care because their internal hardware options are broad.

Where SIMATIC HMI Fits Alongside I/O

An HMI panel rarely stands alone. It typically pairs with a controller and distributed I/O, so identifying the panel is one part of documenting the whole station. If your project also uses distributed I/O, the companion ET 200SP module identification guide walks through the same disciplined approach for those modules. Reading the panel and the I/O with the same rigour keeps your records consistent across the machine.

You can browse the operator-interface range on the HMI panels category page to see how families and order numbers are grouped, which helps confirm that the number you hold belongs to the family you expect.

Preparing an Accurate Inquiry

Once you have identified the device, gather the details that let us match your request precisely. A short checklist:

• The complete 6AV order number, transcribed from the label.
• The panel family and screen size.
• A photo of the rear label showing the order number and any hardware markings.
• The interface set the machine relies on.
• The quantity of units you need for the station.

With those details in hand, submit the inquiry form and our team will work from the exact model you specify. For broader sourcing preparation across a station, the procurement checklist covers the wider set of records worth assembling before you reach out. If any identifier on your panel is unreadable, use the contact page and describe what you can see; we can often work backwards from the machine's documentation to the right SIMATIC HMI model.