A more effective way to
understand, maintain, and run your PLCs.

/cycle-time — Detects waiting times and cycle-time bottlenecks in PLC ladder logic.

Scanning OB1 for timing gaps...

Found 3 bottlenecks:
→  TON T47      1,200ms   Station 4
→  TON T12        840ms   Conveyor Exit
→  WAIT loop      300ms   PackML Init

Longest delay at Station 4. Review T47 first.

/dead-code — Detects disabled, bypassed, or unreachable code in PLC programs.

Scanning for unreachable logic...

Found 4 inactive blocks:
→  FC22          bypassed since 2021
→  Rung 47       condition always FALSE
→  DB14.flag     written, never read
→  CALL FB33     commented block

No active references found. Safe to review.

/interlocks — Audits safety interlocks, drop chains, bypasses, reset logic, feedback monitoring, and stored-energy de-energization.

Auditing interlock chains...

12 interlocks scanned. 2 flagged:
→  E-stop at Cell 3    no reset confirmation
→  DB5.bypassActive    no timeout guard

Recommend adding reset logic and bypass timeout.

/missing-handshake — Detects missing or broken handshake signals between sequenced actors in PLC code.

FINDING 1 — Incomplete Handshake (Conv001 → Rob010): bArmReleased is confirmed but bHeightClear is not — conveyor can advance before arm has fully cleared the pick zone.

/race — Detects race conditions, multiple writers, scan-order bugs, and cross-task tag contention.

Scanning for concurrent write conflicts...

1 race condition found:
→  DB3.runCmd written by OB1 and OB35
   OB35 fires on interrupt, may override OB1

Last write wins. Add arbitration or priority logic.

/signal-trace — Locates a tag or signal in PLC code and traces every read and write site.

Tracing Motor1_Enable...

Write sites (3):
→  FC10 Rung 4    set on start command
→  FC10 Rung 19   cleared on fault
→  OB86           cleared on CPU restart

Read sites: 7 found across 4 function blocks.