In this new course, we will show you how to use Wincc in TIA Portal to create an application that will run in a standard, basic Siemens touch-panel operator interface, or, human-machine interface, HMI for short.
An HMI is a device that allows the operator to visualize the process and interact with the process using graphics displays. These displays may include pushbuttons, data entry ports and other elements that allow the operator to interact with the process.
These displays also include information about the process, such as tank levels, flow rates, pressures and temperatures, and other information, such as process step or mode, recipe information, or equipment status. Some displays allow setup and process configuration data to be entered, while others may show alarm conditions or process events, while others may show diagnostic counters and alerts.
These displays are critical for giving the operator a quick, concise glimpse into the state of the process so that the process can maintain a continuous output of quality product. When an alarm or abnormal condition occurs, the operator is alerted and elements on the graphic displays can be selected to help correct these abnormal situations or allow for quick corrective actions.
The HMI displays work in conjunction with the PLC program to take actions, monitor the process, and generate alarms and other information that will be important to the operator.
An HMI terminal is most often connected to the control network, whether it is Profibus, Profinet, Ethernet, or some other industrial network, and has access to one or more PLC’s and its connected devices.
The HMI is configured with the tag-name database that catalogs the various data connections that it will need to be able to display data from control devices and to make changes in the data in the form of commands. This HMI database can be a stand-alone database in the HMI device, or it may share access to a database created for a PLC or other device.