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WorksheetsAPLC UNIT 5
Total questions: 27
Worksheet time: 14mins
Common reasons why PLC control systems fail:
module failure
power outages
bad network connections
ALL
Possible root cause for I/O module and input/output point problems:
Configuration error
Tripped circuit breaker
Loose terminal block
All
Most of the cases the PLC fails due to following factors:
the input/output (I/O)
Problems with a field device
Problems with the power supply network
All
Protecting both the PLC and maintenance personnel _____ is very Important.
Proper Grounding
Frequent Rebooting
Software Updates
Loose Wiring
EMI stands for _____
Electromagnetic Interference
Electronic Magnetic Induction
Electrical Machine Interface
Energy Management Integration
RFI stands for _____
Radio frequency interference
Remote Frequency Indicator
Random File Input
Rapid Fire Integration
Source of Electromagnetic Interference:
High frequency devices
Power lines
Electric motors
All
Lightning causes _____ Electrical Noise interference.
Electromagnetic interference
Thermal interference
Mechanical interference
Optical interference
The memory of a PLC can become corrupted due to _____
ALL
Power surges
Physical damage
Software bugs
Incorrect wiring
To avoid the possibility of power failure, the majority of today's industrial facilities have _____
Backup power sources
Open windows
Extra parking lots
Swimming pools
Identify the redundant power source for Back up.
UPS
Current source
DC Power Source
AC Power Source
Power failures can cause damage such as _____
System damage & Data loss
Increased internet speed
Improved battery life
Enhanced graphics performance
Faster software updates
On some PLCs, _____ are installed for prolonged power when a blackout hits.
Batteries
Fuses
Relays
Transformers
To safeguard system's smooth communication framework loss, engineers must _____ the connections between devices.
regularly inspect
randomly disconnect
rarely monitor
occasionally ignore
PLC fails factors:
Electromagnetic interference
Electromechanical interference
Electromechanical induction
ALL
EMI _____
Electromagnetic interference
Electronic magnetic induction
Electro mechanical integration
Energy magnetic impulse
The memory of a PLC can become corrupted by _____
ALL
Power surges
Physical damage
Software bugs
Incorrect wiring
What protecting both the PLC and maintenance personnel.
grounding
insulation
fusing
labeling
RFI _____
radio frequency interference
random frequency input
remote file integration
rapid frequency increase
Most PLC control systems need to communicate with periphery devices such as _____
Human Machine Interfaces (HMIs)
Light bulbs
Speakers
Printers
A loss of communication between devices will often result in immediate _____
Plant downtime
increase in production
system upgrade
employee promotion
The peripheral Devices and HMI's are connected with one another via _____ cables.
Ethernet cables
USB cables
HDMI cables
VGA cables
A PLC system surrounded by _____ equipment could be at risk of failure if not properly safeguarded.
Heat emitting
Water cooling
Magnetic
Insulated
To keep the area around the PLC at a relatively low temperature, _____
The cooling setting
The power supply
The input module
The output relay
At temperatures well below the maximum threshold, _____
Manufacturer
Processor
User
Device
A PLC can _____ when the internal status of code is incompatible with something that occurs on the outside.
malfunction or fail
increase efficiency
communicate wirelessly
store more data
In order to reduce the possibility of PLC problems, facility engineers must follow _____ to ensure all parts are safeguarded at all ends.
procedural steps
random checks
verbal instructions
unplanned actions
