PLC Simulator
Pro
10 min

CCST 29 — Drive Fault / Alarm Handling

ccstmotiondrivefaultalarm
CCST 29 — Drive Fault / Alarm Handling scenario preview

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Briefing

A drive faults (DRIVE_FAULT input) — shut down DRIVE_RUN immediately, latch FAULT_ALARM, and wait for FAULT_ACK to clear it before allowing a restart.

Objectives

  • DRIVE_RUN drops immediately on DRIVE_FAULT
  • FAULT_ALARM latches and only clears on FAULT_ACK
  • Motor cannot restart until FAULT_ALARM is cleared

Hints

  • FAULT_ALARM latches SET on DRIVE_FAULT, RST on FAULT_ACK
  • DRIVE_RUN := DRIVE_CMD AND NOT FAULT_ALARM

I/O Table

Inputs

DRIVE_CMD

Drive run command

BOOL · %I0.0

DRIVE_FAULT

Drive fault signal

BOOL · %I0.1

FAULT_ACK

Fault acknowledge

BOOL · %I0.2

Outputs

DRIVE_RUN

Drive run output

BOOL · %Q0.0

FAULT_ALARM

Fault alarm output

BOOL · %Q0.1

Your program will be tested against:

All test cases run automatically when you submit. Assertions are hidden until you pass.

  1. #1Drive runs on cmd

    Drive runs on cmd

  2. #2Drive drops on fault

    Drive drops on fault

  3. #3Clears on ACK

    Clears on ACK

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