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HMI and Scada systems
"HMI (human machine interface) and SCADA (supervisory, control and data acquisition) packages are the link between the
control system and the outside world. These enable users to input production requirements, as well as gather in return
information about production parameters, production rates, lost time information etc. Equipment can range from a basic
keypad and LCD screen, to very sophisticated PC based systems which can connect into the user's own network.
The HMI can be programmed so that an unskilled operator can be led, in easy-to-follow steps, through all that he needs to
do to set up the process or product as required. The higher end HMIs include "recipe" handling facilities, which, as the
name implies, allows for extremely simple management of product types and mixes.
The HMI will also keep the operator informed as to the current status of the process. Gone is the need for a flashing red
warning light and the hope that this will eventually lead to a fault being traced ! The PLC / HMI combination is powerful
enough (with the correct programming) to isolate and identify faults immediately. Maintenance staff are grateful, and
productivity is improved.
At the more powerful end, SCADA software can run on a PC, connected to the PLC, and carry huge amounts of data to or from
the machine or process. The shop floor can become available on your office desktop PC.