CSI Installation, Configuration & Troubleshooting 2

Question 1

When integrating a new industrial controller into an existing SCADA network, which step should be performed FIRST?

Accepted Answer

Conduct a site survey and document existing network topology

Answer

A site survey and topology documentation ensures the integrator understands existing infrastructure before making any physical or logical changes.

Question 2

A technician installs a VFD (Variable Frequency Drive) but the motor runs at incorrect speed. The most likely configuration issue is:

Accepted Answer

Incorrect base frequency or motor poles parameter

Answer

Base frequency and motor pole count directly determine the speed calculation; incorrect values cause the VFD to output the wrong synchronous speed.

Question 3

Which protocol is most appropriate for time-sensitive communication between PLCs on a manufacturing floor requiring deterministic data delivery?

Accepted Answer

PROFINET IRT

Answer

PROFINET IRT (Isochronous Real-Time) provides deterministic, cycle-synchronized communication suitable for high-speed motion control and I/O.

Question 4

During commissioning, an analog sensor reads 0 mA when the process value is at minimum. The standard 4–20 mA signal specification requires 4 mA at minimum. This condition most likely indicates:

Accepted Answer

An open-circuit or broken loop condition

Answer

A 0 mA reading in a 4–20 mA loop indicates an open circuit or broken loop, since even at zero process value the signal should be 4 mA.

Question 5

A newly installed Ethernet-based control network experiences intermittent communication faults. The integrator checks cable runs and finds several cable segments exceed 110 meters. The issue is most likely:

Accepted Answer

Signal attenuation due to exceeding the 100-meter Cat5e/6 segment limit

Answer

Standard 100BASE-TX/1000BASE-T Ethernet over copper is limited to 100 meters per segment; exceeding this causes signal degradation and intermittent errors.

(CSI) Certified System Integrator Practice Test

(CSI) Certified System Integrator Practice Test

CSI Installation, Configuration & Troubleshooting 2