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14. Automation System
Wärtsilä Unified Controls – UNIC is a modular embedded automation system. UNIC C2 has
a hardwired interface for control functions and a bus communication interface for alarm and
monitoring.
14.1 UNIC C2
UNIC C2 is a fully embedded and distributed engine management system, which handles all
control functions on the engine; for example start sequencing, start blocking, speed control,
load sharing, normal stops and safety shutdowns.
The distributed modules communicate over a CAN-bus. CAN is a communication bus
specifically developed for compact local networks, where high speed data transfer and safety
are of utmost importance.
The CAN-bus and the power supply to each module are both physically doubled on the engine
for full redundancy.
Control signals to/from external systems are hardwired to the terminals in the main cabinet
on the engine. Process data for alarm and monitoring are communicated over a Modbus TCP
connection to external systems.
Alternatively modbus RTU serial line RS-485 is also available.
Fig 14-1 Architecture of UNIC C2
Short explanation of the modules used in the system:
Main Control Module. Handles all strategic control functions (such as start/stop sequen-
cing and speed/load control) of the engine. MCM
Engine Safety Module handles fundamental engine safety, for example shutdown due
to overspeed or low lubricating oil pressure. ESM
Wärtsilä 32 Product Guide - a21 - 7 September 2016 14-1
14. Automation System Wärtsilä 32 Product Guide