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A control server may also be referred to with these terms in a SCADA system: MTU, supervisory controller, or SCADA server.  +
Many engineering workstations are laptops. Because of their mobile nature, lack of desktop standard, and frequent connection to control system devices and network, engineering workstations can serve as entry points for attacks.  +
Typically programmed in an IEC 61131 programming language, a PLC is designed for real time use in rugged, industrial environments. Connected to sensors and actuators, PLCs are categorized by the number and type of I/O ports they provide and by their I/O scan rate.[[CiteRef::Guidance - ISA99]] An RTU is a special purpose field device that supports SCADA remote stations with both wired and wireless communication capabilities, in order to communicate with the supervisory controller. Wireless radio is leveraged in remote situations where wired communications are not available; typically with field equipment. This role may also be fulfilled by PLCs with radio communication capabilities. The PLC may still be referred to as an RTU in this case.[[CiteRef::Guidance - NIST SP800-82]]  +
In many cases, these involve video screens or computer terminals, push buttons, auditory feedback, flashing lights, etc. The human-machine interface provides means of:[[CiteRef::Guidance - ISA99]] *Input - allowing the users to control the machine *Output - allowing the machine to inform the users  +