When you're outfitting a control panel, the operator interface is the part your team actually touches. Two Siemens HMI touch panels are competing for that spot: the 6AV6641-0CA01-0AX1 and the 6AV2123-2GB03-0AX0. Both are industrial touch-screen interfaces from Siemens, and both list a Country of Origin of Germany. The real differences come down to controller platform and listed price: the two panels pair with different platform references, and the price spread between them is USD 71.35.
Quick Verdict: Choose the 6AV6641-0CA01-0AX1 when the platform label matters more than price. Choose the 6AV2123-2GB03-0AX0 when you want the KTP700 model at a lower listed price.
Comparison at a Glance
| Product | Listed Price | Price Bar |
|---|---|---|
| 6AV6641-0CA01-0AX1 | USD 685.35 | |
| 6AV2123-2GB03-0AX0 | USD 614.00 |
The price bar shows the relative listed-price position; the longer bar belongs to the 6AV6641-0CA01-0AX1.
Where Each Product Stands Out
The 6AV6641-0CA01-0AX1 lists its Type as Touch Panel and carries the full part number in the title, so you can confirm the exact model before you commit. That makes it the better choice if model verification is a priority.
The 6AV2123-2GB03-0AX0 brings the KTP700 model name into the title and sits at the lower end of the price spread. If you already have a KTP700 in the back of your mind, this title makes the match easy.
Product Notes
#### 6AV6641-0CA01-0AX1 Siemens HMI Touch Panel
This listing is for buyers who want Simatic written into the platform design. The Controller Platform is recorded as Simatic and the Type is Touch Panel, so it pairs naturally with a Simatic-based control environment. The full part number appears in the title, which makes it easy to verify against your own BOM. The listing is Siemens-branded, so it fits a cabinet already built around Siemens automation. The trade-off is its price position: it is the higher-priced of the two Siemens panels shown here. If the Simatic platform label is necessary for your project, this is the one to consider; if not, the price gap with the KTP700 may be hard to justify.
#### 6AV2123-2GB03-0AX0 Siemens SIMATIC HMI KTP700 Touch Screen
This listing is built around the S7/300 controller platform, and the KTP700 model name is right in the title. That direct platform pairing makes it the easier choice when your PLC environment is S7/300. It also carries the lower listed price in this head-to-head, so it asks for a smaller outlay at the start. The listing keeps the Siemens brand, so you are still staying within the same brand family. The trade-off is that the platform reference is specifically S7/300; if your system expects the Simatic platform label or a different controller family, the 6AV6641 listing offers that Simatic label instead. For an S7/300-centered build, the KTP700 keeps both the model name and the price on your side.
Final Choice by Use Case
If your control documentation is written around the Simatic platform, the 6AV6641-0CA01-0AX1 is the panel that speaks the same language. It asks for the higher listed price, but it gives you the Simatic platform label and a full part number in the title. If your PLC system is built around the S7/300 controller and you are comparing one panel against another, the 6AV2123-2GB03-0AX0 is the lower-priced listing and the one with the KTP700 model name in the title. Both are Siemens touch-screen HMIs, so the final decision usually comes down to whether you need the Simatic label or want the S7/300 pairing and the lower price.
