For completely dead touch input:
If the touch is so misaligned that you cannot tap the calibration target:
What happens if you accidentally calibrate to a stuck pixel or a damaged spot? The HMI enters a boot loop or boots to a blank screen.
Most older or budget-friendly MCGS models use resistive touch technology (pressure-sensitive). Unlike your phone’s capacitive screen, these rely on precise voltage alignment between the LCD and the touch film.
Common causes of misalignment:
Q1: Does MCGS HMI calibration affect my project logic? No. Calibration only changes how touch coordinates are mapped to the screen. It does not alter your tags, alarms, recipes, or ladder logic.
Q2: How long does calibration take? Less than 30 seconds from start to finish.
Q3: Can I calibrate without a stylus? For resistive screens, it is not recommended. For capacitive screens, your finger is fine.
Q4: My MCGS screen reboots during calibration. What’s wrong? This indicates a power supply issue. The calibration routine may draw extra current. Check your 24V DC power supply for voltage drop. mcgs hmi touch calibration
Q5: Is there a difference between "touch calibration" and "screen alignment" in MCGS? No. The terms are used interchangeably.
Q6: Can I perform remote calibration over Ethernet? Not directly. However, you can use remote desktop software (like VNC) if your MCGS HMI supports it. The remote mouse movements will simulate touches, but you will need someone on-site to press the physical targets.
Before turning screws or tapping screens, understand the root cause. The MCGS uses a resistive touch overlay. Unlike a smartphone (capacitive), resistive screens rely on physical pressure. Two conductive layers touch when you press the screen, creating a voltage change.
Calibration fails for three primary reasons: For completely dead touch input: If the touch
When the screen’s calculated coordinate map no longer matches the LCD’s physical pixel grid, you need a fresh calibration.
To understand calibration, one must distinguish between two coordinate systems:
The goal of calibration is to find a transformation matrix that converts Physical Coordinates $(X_p, Y_p)$ into Logical Coordinates $(X_l, Y_l)$.
To get the most out of your MCGS HMI and avoid frequent recalibration, follow these expert recommendations. Before turning screws or tapping screens, understand the