A & R Weekly Quiz Week 5

What is the function of a PLC’s communication interface?

• To communicate with other PLC

• To communicate with an HMI or SCADA system

• To communicate with other devices or systems

• All of the above

1. What is the most common physical layer used for Modbus communication?

• RS-232

• RS-485

• Ethernet

• USB

What is the maximum number of devices that can be connected to a single Modbus network?

• 32

• 64

• 128

• 256

Is Modbus protocol a master-slave or peer-to-peer protocol?

• Master slave

• Peer to peer

.......................is a security system that monitors and controls incoming and outgoing network traffic.

• Firewall

• Hub

• Switch

• LAN

Ethernet is a standard for

• LAN

• WAN

• MAN

• All of these

Which topology is used in Ethernet?

• Mesh

• Bus

• Tree

• Ring

Ethernet is another name of ............

• MAN

• WAN

• LAN

• PAN

Which of the following modes of communication supports two way traffic but in only one direction at a dime?

• Simplex

• Half duplex

• Full duplex

• All of these

What is the maximum device handling capacity of serial standard protocol RS485 in terms of drivers and receivers on a single line?

• 8

• 10

• 16

• 32