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Siemens · Allen-Bradley · Kongsberg
PLC & Automation / IAS
PLC fault-finding, IAS reprogramming, alarm rationalisation (EEMUA 191), redundant CPU sync, OT cyber baseline.
Service available at all US ports — 24/7 worldwide. Our next available technician contacts you within 1 hour.
Symptom checklist
What we hear from the bridge.
- ›PLC battery low warning, backup memory at risk
- ›Modbus RTU comms drop between PLC and remote I/O
- ›Hot-spare CPU fails to sync on redundant rack
- ›HMI graphics mismatch with P&ID after revision
- ›Random scan time spikes from 30 ms to 200 ms
Likely root causes
Where the fault usually lives.
- ›Aged lithium backup (BR2/3A) on PLC CPU below 2.7V
- ›Missing Modbus RS485 termination resistor
- ›Firmware version mismatch between primary and standby
- ›I/O scan logic poorly partitioned
Equipment we bring
Calibrated test equipment, class-acceptable reports.
- RSLogix 5000, Siemens TIA Portal, CODESYS
- Wireshark with Modbus/Profibus dissectors
- B&B USB-COMi RS485 bus analyser
- Tek MSO44 mixed-signal scope
Reports compatible with DNV · BV · ABS · Lloyd's · TL · RINA · ClassNK · IRS.
Often needed together
Parts most often requested with this service.
- plc cpus
- remote io
- hmi spares
- industrial switches
FAQ
Common questions for this system.
- Can we attend remotely via the cabinet's service VPN?
- For diagnostic and configuration export, yes — Kongsberg / Praxis / ABB remote service links let us read the controller without boarding. The physical card swap still needs an ETO at the cabinet.
- Which automation platforms do we cover?
- Kongsberg K-Chief 600/700, Praxis Selma, ABB AC-700, Lyngsø Marine, Siemens S7-1500 marine variants, Allen-Bradley ControlLogix. Service tools and basic spares for each on every dispatch.
- How long does a typical PLC card attendance run?
- Four to eight hours alongside, depending on configuration restore time and whether dual-redundancy fail-over is available. Single-controller cabinets in single-line propulsion vessels need a planned standstill.
Have a vessel calling?
Three quick questions — port, when, contact. Our next available technician will contact you within 1 hour.