6AV6640-0CA11-0AX1 Siemens: HMI Panel Configuration Guide By wayne No Comments on 6AV6640-0CA11-0AX1 Siemens: HMI Panel Configuration Guide 3 Min Read This guide walks you through configuring the Siemens 6AV6640-0CA11-0AX1 HMI panel step-by-step, from initial setup to custom screen design, ensuring smooth operator interface integration.