Engineering Intelligence
Engineering Case Explorer
Field-proven industrial failure cases — the corroborated intelligence Hermes Brain ranks against during root-cause analysis.
Total Cases
14
Vendors Covered
7
Domains Covered
7
Vendor
Domain
S7-1200 BF after CPU swap
78%SiemensPLC
- Root cause
- PROFINET device name not assigned to the replacement CPU
- Corrective action
- Assign the configured device name and IP to the new CPU
S7-1500 cycle watchdog from SCL loop
78%SiemensPLC
- Root cause
- Unbounded SCL loop iterating a growing recipe array
- Corrective action
- Bound the loop with an explicit iteration limit
ACS580 overcurrent at acceleration
78%ABBDrives
- Root cause
- Acceleration ramp too short
- Corrective action
- Increase ramp time
Motor phase imbalance from bus joint
78%ABBMotors
- Root cause
- Degraded busbar joint creating supply asymmetry
- Corrective action
- Re-torque the degraded bus joint to schedule
ATV320 OCF from cable fault
78%Schneider ElectricDrives
- Root cause
- Phase-to-earth short in the motor cable gland
- Corrective action
- Replace the damaged gland section
M580 Modbus timeouts from over-polling
78%Schneider ElectricOT Network
- Root cause
- Aggregate poll rate exceeding the CPU Modbus server budget
- Corrective action
- Batch contiguous registers into block reads
PLCnext MQTT drops behind firewall
78%Phoenix ContactOT Network
- Root cause
- MQTT keep-alive longer than the firewall NAT idle timeout
- Corrective action
- Set keep-alive below the NAT idle timeout
DI chatter near VFD cable
78%Phoenix ContactDigital I/O
- Root cause
- Unshielded sensor cable sharing the tray with VFD output
- Corrective action
- Reroute or shield the sensor run
Delta VFD overheat from clogged heatsink
78%DeltaDrives
- Root cause
- Heatsink fins clogged with dust
- Corrective action
- Clean heatsink and replace filters
DOP HMI RS-485 termination loss
78%DeltaHMI
- Root cause
- Missing termination on the extended RS-485 segment
- Corrective action
- Terminate both ends correctly
FX5 output flicker from double coil
78%MitsubishiPLC
- Root cause
- Double coil assignment writing the same output twice
- Corrective action
- Consolidate to one rung with combined logic
MR-J4 AL.16 encoder connection
78%MitsubishiDrives
- Root cause
- Encoder connector partially seated after panel work
- Corrective action
- Restore correct seating and shield bond
NX safe-state hold from EDM feedback
78%OmronPLC
- Root cause
- EDM feedback contact never returning — welded contactor
- Corrective action
- Replace the welded contactor
E5CC drift from copper TC extension
78%OmronAnalog I/O
- Root cause
- Thermocouple extended with copper wire
- Corrective action
- Replace the copper run with matching TC extension cable