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These 10 free C-361 questions are organized by exam domain, so you can see how each part of the Programmable Conveyor Systems 1 (C-361) blueprint is tested. Reveal the answer and explanation under each question.
Before servicing a pallet lift at a U.S. manufacturing plant, authorized staff lock out its electrical and pneumatic supplies and verify those isolations. The supply gauge reads zero, but a check valve traps air in the lift cylinder and the raised carriage is unsupported. What remains necessary before anyone works beneath the carriage?
Correct answer: B - Restrain the carriage and control trapped pressure under the approved energy-control procedure.
Near the end of a shift, normal Stop is requested while a carrier is halfway from zone A to its empty, reserved destination B. A second carrier is queued upstream. This machine's normal-stop sequence finishes a transfer already in progress but must not admit another carrier. Guards and transfer conditions remain healthy. Which command sequence preserves the intended shutdown?
Correct answer: A - Block new feed, complete the in-flight transfer, then stop.
In Manual Single Cycle, each new Cycle Start request is intended to execute exactly one complete transfer. One request has been accepted, the pallet has arrived, and the transaction is complete. A second pallet is ready, but no second request has been accepted. Which controller behavior reveals a mode-control defect?
Correct answer: C - The next carrier is released because the transfer permissives remain true.
A worker's loose sleeve catches in the moving conveyor chain and begins drawing the worker toward a nip point. Another operator is beside the emergency-stop button; the main electrical disconnect is across the aisle. The normal Stop function allows an in-flight transfer to finish. What should the operator do first?
Correct answer: B - Actuate the emergency-stop button immediately.
At an asynchronous pallet-transfer line, station 1 has finished processing but its pallet remains against the stopper. Its one-pallet destination at station 2 is occupied by a carrier still being processed. Live PLC data show no transfer request, both drives ready, and no fault. Other zones are operating normally. How should the operator interpret this pause?
Correct answer: C - Station 1 is blocked; retain its pallet until station 2 becomes available.
A station remains in WAIT_FOR_PALLET. A guarded test of its pallet photoeye produces these live observations: Sensor indicator: follows the pallet correctly. Assigned physical PLC input bit: follows the sensor correctly. Zone2Present logic variable: stays at 0. No I/O forces are active. Where should fault isolation begin?
Correct answer: D - The program's mapping of the physical input to the Zone2Present logic variable.
Two feeder conveyors, A and B, share a one-pallet destination. A receives the reservation, withdraws its request, and releases its pallet. The program clears A's reservation as soon as A's departure sensor goes OFF. Before the pallet reaches the destination sensor, B receives the reservation and also releases. Travel time varies over several PLC scans. Which logic change removes this race?
Correct answer: B - Retain A's reservation through confirmed arrival and transaction completion.
A proposed PLC run latch must satisfy three requirements: an accepted StartPulse starts the conveyor; RunPrev holds it running afterward; and either Stop=1 or Enable=0 cancels running, even if StartPulse is also 1. Enable is an ordinary process permissive, and RunPrev is the previous stored run state. Which Boolean expression satisfies all three requirements?
Correct answer: C - RunNext = Enable AND NOT Stop AND (StartPulse OR RunPrev)
An HMI's nonlatched reader alarm returns to normal when communication recovers. The connection has recovered, but the operator has not acknowledged the occurrence. Which state should the alarm list show?
Correct answer: D - Cleared and unacknowledged.
An RFID acceptance run requires at least 99.0% first-attempt read success. The test record shows: Carriers tested: 500. Successful first reads: 490. Retries: one for each of the other 10 carriers; eight succeed and two fail. Which result belongs in the report for the first-attempt criterion?
Correct answer: A - 98.0%; the criterion fails using 490 successful first reads out of 500 carriers.
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