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These 10 free FESTO-L2-PLC2 questions are organized by exam domain, so you can see how each part of the Level 2: Advanced Mechatronics PLC Technology II: Allen Bradley or Siemens (FESTO-L2-PLC2) blueprint is tested. Reveal the answer and explanation under each question.
A physically normally closed Stop pushbutton gives Stop_OK=1 when released and Stop_OK=0 when pressed. In a Rockwell Logix motor-command rung, XIO Stop_OK is in series with the start/seal-in branch. To make the Stop condition permissive when released and false when pressed, choose:
Correct answer: C - Replace XIO Stop_OK with XIC Stop_OK.
A reversing conveyor uses these commands: FwdCmd = FwdRequest AND NOT RevFeedback RevCmd = RevRequest AND NOT FwdFeedback The feedback bits report energized contactors. In a simulation, both requests rise from 0 to 1 together while both feedback bits remain 0 throughout the evaluation. The required response to conflicting requests is to block both commands. Which edit provides that response?
Correct answer: D - Require NOT RevRequest for FwdCmd, and NOT FwdRequest for RevCmd.
An exhaust-fan command follows the DN bit of a Rockwell Logix TOF using a TIMER tag with PRE=3000 ms. A process-stop request has made the timer rung false. During the normal off-delay, ACC=1200 ms. Select the timer status bits at that instant.
Correct answer: B - EN=0, TT=1, DN=1.
An approved S7-1200 PLC correction exists only in the controller. The TIA Portal V20 laptop project contains older PLC logic and an HMI screen revision that has not been installed. Before reconciling them, the engineer needs separate recoverable offline copies of both sets of work. What is the appropriate sequence?
Correct answer: B - Archive the laptop project, then upload the PLC into a separate project.
A test log appears inconsistent: the watch display reads an input at 0 ms and 500 ms, showing 0 both times, yet the event counter advances from 0 to 1. The test source held the PLC-visible input bit high from 40 ms until 46 ms. The PLC evaluates the input every 1 ms; the counter increments only on an observed rising edge and has no other writer. How can the results be reconciled?
Correct answer: C - The PLC counted the pulse; the watch display sampled before and after it.
An HMI’s BELT MOVING indicator must show actual movement during automatic operation, local jogging, and coastdown after the motor command turns off. StartRequest is the HMI request bit; MotorCommand is the PLC output demand; BeltMotion is 1 while a verified detector senses belt movement and 0 otherwise. All three tags have good quality. Which expression should drive the indicator?
Correct answer: A - BeltMotion
Entering 4.75 bar on a FactoryTalk View ME screen writes 475.0 to the receiving REAL tag. The numeric-input object uses two fixed decimal positions. Communication is good, the PLC expects bar, and no optional expression or PLC scaling alters the write. Which object change preserves the entered pressure?
Correct answer: A - Send the displayed value rather than the stripped value.
A replacement HMI and a PLC share the same VLAN on a Layer 2 switch, with no router. The PLC address is 10.42.8.146 and its mask is 255.255.255.192 (/26). The HMI must use that same mask; none of the candidate addresses is in use. Select the HMI address that supports direct IPv4 communication with the PLC.
Correct answer: D - 10.42.8.173
A photoelectric input fails to set PartPresent. The technician records: • Sensor: 24 V PNP; compatible sinking input group, common at 0 V. • Raw input channel 6: 0 with no target, 1 with a target. • PartPresent: mapped to unused channel 7; remains 0 in both tests. No forces are active. The repair supported by these checks is to:
Correct answer: A - Map PartPresent to channel 6 and verify both target states.
During U.S. servicing covered by OSHA 29 CFR 1910.147, an authorized employee shuts down a pneumatic pusher and locks its electrical and compressed-air supply isolators. The cylinder-side gauge still reads 4 bar. Trapped air can move the pusher, and no restraint prevents that movement. What must happen before anyone enters the pinch-point area?
Correct answer: D - Control the trapped energy under the machine procedure and verify isolation.
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