CCST CCST Communications & Networking in Control Systems

Question 1

Which industrial communication protocol uses a token-passing bus architecture and is commonly found in legacy process control systems?

Accepted Answer

PROFIBUS DP

Answer

Modbus RTU

Answer

HART

Answer

Foundation Fieldbus

Question 2

What is the primary purpose of the HART (Highway Addressable Remote Transducer) protocol in process control?

Accepted Answer

Simultaneous analog and digital communication over the same two-wire loop

Answer

High-speed data transfer between PLCs

Answer

Wireless sensor communication

Answer

Ethernet-based control networking

Question 3

In an industrial control network, what does the term 'determinism' refer to?

Accepted Answer

The guarantee that messages are delivered within a defined, predictable time frame

Answer

The ability to encrypt all network traffic

Answer

Automatic error correction in data packets

Answer

Dynamic IP address assignment

Question 4

Which OSI model layer is responsible for defining the electrical and physical characteristics of a fieldbus network cable?

Accepted Answer

Physical layer

Answer

Application layer

Answer

Transport layer

Answer

Data link layer

Question 5

What is the maximum number of devices that can be addressed on a single HART multidrop network segment?

Accepted Answer

15

Answer

4

Answer

32

Answer

64

Question 6

A control system technician needs to isolate a segment of an industrial Ethernet network for troubleshooting. Which device is used to create logical network segments at Layer 2?

Accepted Answer

Managed switch

Answer

Router

Answer

Hub

Answer

Repeater