WorksheetsFIRSTLOGIC AUTOMATION QUIZ
Total questions: 10
Worksheet time: 3mins
In ladder logic, what condition must be true for a TON timer to begin accumulating?
The rung is false
The preset value is zero
The enable input is true
The counter is zero
What happens when a retentive timer (RTO) is disabled in the logic?
It resets automatically
It keeps the accumulated value
It resets and disables the preset
It stops the scan cycle
You want to count the number of rejected parts. Which instruction will you use?
CTD
TON
CTU
JMP
What happens if a PLC program uses the same output coil (Y0) in multiple rungs?
All rungs will fail
The last condition scanned will control the output
PLC throws an error
Output alternates randomly
What type of PLC memory is typically non-volatile (retains value after power loss)?
RAM
Temporary memory
EEPROM / Retentive memory
Output register
You want a motor to start only if a door is closed and a sensor is active. What logic should you use?
OR logic
XOR logic
AND logic
NOT logic
What is the purpose of a NEGATIVE edge trigger instruction?
Detect signal rising from 0 to 1
Hold value when condition is true
Delay input signal
Detect signal falling from 1 to 0
What is the best way to control a three-phase motor forward and reverse using PLC logic?
Use a single output with toggling
Hold value when condition is true Use SET for forward, RST for reverse
Use interlocked outputs with separate contacts for forward and reverse
Use analog output for direction control
You observe that HMI is not updating values from the PLC. What could be the issue?
Screen resolution too low
Wrong protocol or tag address
Too many animations
Network ping is low
Which of the following HMI objects is typically used to display analog values (e.g., temperature, speed)?
Text button
LED indicator
Trend chart
Alarm viewer
