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Glossary term

Redundant Array of Independent Disks (RAID) is a technique that server-class computers use to both improve speed of on-disk storage and to improve reliability. Using multiple disks, the computer splits up and/or copies data across the disks so that if one of the disks breaks, no data is lost and the server doesn't crash. You will often hear storage described as RAID 0, RAID 1, etc. The number indicates the type of storage, not the number of hard drives.


Glossary term

In SCADA systems, a Remote Terminal Unit (RTU) is a device installed at a remote location that collects data, codes the data into a format that is transmittable and transmits the data back to a central station, or master.

In Modbus devices, you will sometimes see 'RTU over TCP' as the connection type. This just means that TCP is used to transport data through the network, but the data being transported is using the Modbus RTU format.


Glossary term

A runtime is the part of Ignition that an operator can interact with. It connects to the Ignition Gateway through the network and will allow the operators to control or view anything the designer has already set up. This is a part of the Vision module and often referred to as a Client.