Chapter 13, Distributed Logic Control

Question 1

The four basic parts of a SCADA system are:

Answer 1

1. Field devices
2. RTU’s and PLC’s
3. Communication links
4. Central operator workstations

Question 2

Components of a DCS (distributed control system)

Answer 2

-Sensing elements and transmitters
-A Network
-Input/Output (I/O) cards
-Controllers
-FCE’s
-Operator workstations (OIU)

Question 3

RTU (remote terminal unit) consists of:

Answer 3

-microprocessors
-memory
-I/O terminals
-power supply

Question 4

The four different video displays OIU’s use are:

Answer 4

1. Graphic
2. Detail
3. Trend
4. Alarm

Question 5

Logic Gate definition:

Answer 5

An electronic circuit or device that usually has TWO binary inputs and ONE binary output

Question 6

Boolean Algebra:

Answer 6

A branch of algebra where variables can only have one of two values

Question 7

PLC Programming Languages:

Answer 7

-Ladder diagram
-Function Block diagram
-structured text
-sequential function chart
-instruction list

Question 8

The 4 actions available on the RTU are:

Answer 8

-Download configurations to RTU’s
-Upload historical logs
-Change operating parameters
-Manipulate processes