20EI217 Industrial Automation Surprise Quiz 2

Sensors and control relays can't generate or interpret protocol communication, _______ is needed to provide an interface between the sensors and the SCADA network.

• Field instruments

• Optical fibres

• HMI

• RTU's

Many digital control systems utilize Ethernet as a communications network, because

• Speed is not affected by traffic

• It is a wireless network standard

• It is fully deterministic

• It is robust and inexpensive

The standard form of RTU is_____________

• Reverse Terminal Unit

• Remote Terminal Unit

• Reverse Terminal Unit

• 0-24V

Data acquisition system interfaces between the real world of physical parameters which are _____ and the artificial world of _______ computation and control

• Analog, digital

• Digital, analog

• Variable, data

• Data, variable

Local control unit is the smallest collection of the hardware in the distributed control system that performs

• Closed loop control system

• Reads only digital input and outputs

• Reads and writes analog inputs and outputs

• Writes digital input and output

Low Level Human Interface (LLHI) connected directly

• LCU or DI/DO via dedicated cabling

• LCU

• DI/DO

• DI/DO via shared communication

Monitoring and controlling the process under normal operating conditions are relatively simple functions compared to operation under abnormal conditions caused by plant equipment or in the instrumentation and control system.

• Process record keeping

• Process diagnostics

• Process control

• Process monitoring

TIA/EIA-485 (formerly known as RS-485) is a digital communication standard with the following traits.

• Single-ended voltage signaling, multidrop

• FSK signaling, superimposed on analog 4-20 mA

• Manchester encoding, multidrop

• Differential voltage signaling, multipoint

Operator interface must allow the operator to have rapid access to all continuous and logic sequences is one the basic requirement for

• Process record keeping

• Process diagnostics

• Process control

• Process monitoring

A separate communication controller interfaces the central processor with the shared communication facility __________

• Centralized configuration

• Modular configuration

• Fixed configuration

• Overlap configuration