The expansion for PLC and HMI, "PLCHMI", is a system composed of an interface that includes PLC modules such as CPU, digital I/Omodule, analog I/O module, communications module, etc. and a control box with HMI display.
The PLC interface is the module that contains the PLC controller, different analog and digital I/O modules and the necessary communicationmodules to communicate with different devices such as HMI, PC, tablet, etc. To communicate with the HMI and/or a PC, the equipmenthas two Ethernet ports.
There is also a SCSI connector to connect the PLC interface with equipment that carries out process control. Inaddition, the PLC interface could be provided with any other connector or communication port (USB, DB-9 or DB-25 serial connector, etc.)to establish a communication between the expansion and the process control unit.
The HMI control box contains a touch panel to monitor and control the process control equipment. By means of the HMI screen thevariables and results of the process can be visualized graphically as well as to control the different actuators. Communication with thecontrol interface is via Ethernet.