Choosing the right PLC HMI can stall when you're weighing screen size, controller platform, and whether a single box includes both the touch screen and the logic unit. These four options - a Siemens SIMATIC HMI KTP700 at the top of the listed price range, a Schneider HMIS65 in the middle, a Coolmay TK & M3S PLC combo, and a Panasonic AIG703WGN1B2 at the lower end - show how wide the field is. The real decision comes down to how much you need at the panel and which controller environment you are already in.
Quick Take
Here's the short version: If you want a complete HMI and PLC in one set, the Coolmay TK with M3S PLC combo includes the matching cable and lists HMI sizes from 4.3 in to 10 in. If you want the lowest listed price, the Panasonic AIG703WGN1B2 is a compact 3.8-inch touch panel. If you have a Siemens S7/300 control cabinet, the KTP700 targets that platform directly. And the Schneider HMIS65 sits in the middle with the Automate controller platform.
Listed Price Comparison
| Product | Listed Price | Price Bar |
|---|---|---|
| 6AV2123-2GB03-0AX0 Siemens SIMATIC HMI KTP700 Touch Screen | USD 614.00 | |
| 1PC New Schneider HMIS65 HMI Touch Screen #US | USD 347.10 | |
| Coolmay TK HMI Touch Screen & M3S PLC Combo Set with Cable | USD 382.56 | |
| AIG703WGN1B2 Panasonic Industrial PLC Touch Screen Machine Interface HMI | USD 149.00 |
Decision Matrix
| Product | Ideal Use Case | Keep in Mind |
|---|---|---|
| Siemens SIMATIC HMI KTP700 | Siemens-centric control cabinets | Highest listed price in this group |
| Schneider HMIS65 | Automate controller environment | Single HMI panel |
| Coolmay TK & M3S PLC Combo | HMI and PLC in one package | Controller included in set |
| Panasonic AIG703WGN1B2 | Basic operator interface | Monochrome gray-scale display |
Product Notes
6AV2123-2GB03-0AX0 Siemens SIMATIC HMI KTP700 Touch Screen
This Siemens panel is built around the S7/300 platform in its controller setup. Its Controller Platform is S7/300, which makes it a direct fall-in for Siemens-based machines. It is also tied to Germany as the country of origin and AC current type. The trade-off is the listed price: at $614, it is the highest-priced panel in this four-product comparison. You are paying for that platform alignment rather than for a bundled PLC or a larger touch screen. If your programs already run in the S7/300 environment, this is the HMI that speaks that language natively.
1PC New Schneider HMIS65 HMI Touch Screen #US
Listed at $347.10, this one-unit Schneider HMI carries the model name HMIS65 and names the Automate controller platform. The country of origin is France. For shops already on Schneider's automation environment, this panel is a clearly specified touch interface without the extra controller hardware. It lands between the $614 Siemens and the $149 Panasonic in listed price, which makes it a middle-cost option. The key consideration is the Automate controller platform - if your PLC uses a different automation environment, this panel will not be the direct match that the Siemens S7/300 model is for its own ecosystem.
Coolmay TK HMI Touch Screen & M3S PLC Combo Set with Cable
The Coolmay kit is the only entry here that bundles the HMI and the PLC together. It includes the M3S PLC and a communication cable, and supports HMI screen sizes from 4.3 in to 10 in, with a plastic/metal housing and a color identifier of M3S-40MT for the PLC side. At $382.56, it costs more than the Schneider HMIS65 but less than the Siemens KTP700. Because the controller is included, it is a good fit for a new machine build where you need both pieces to match from the start. The trade-off is having to accept the bundled M3S PLC as your controller; if you already own a PLC, you would be buying extra hardware.
AIG703WGN1B2 Panasonic Industrial PLC Touch Screen Machine Interface HMI
This Panasonic panel is the lowest-listed-price option at $149 and uses a 3.8-inch TFT monochrome LCD. It offers a 480×192 resolution, a three-color LED backlight (green, orange, red), RS-232C serial, Ethernet, and a mini-USB tool port. That gives you core connectivity in a compact operator interface. The limitation is the gray-scale monochrome display - if your alarms or screens rely on color, this panel won't present those cues the same way. For a basic touch screen at the lowest listed price, it keeps the feature set focused on essential functions.
Final Recommendation by Use Case
Line up your controller environment first. If you are building or maintaining a Siemens S7/300 system, the SIMATIC HMI KTP700 is the direct platform match. If you are running Schneider controls, the HMIS65 is the panel to look at. For a new automation project where you want both the HMI and PLC in one box, the Coolmay TK set is the all-in-one option. For a basic touch interface on simple machine control, the Panasonic AIG703WGN1B2 handles the job. Choose based on what you already have on the control bus, then let the price bars above decide between the remaining candidates.
