14. Automation System
Wärtsilä Unified Controls – UNIC is a modular embedded automation system. UNIC C3 is used for engines
with electronically controlled fuel injection and has a hardwired interface for control functions and a bus
communication interface for alarm and monitoring.
14.1 UNIC C3
UNIC C3 is a fully embedded and distributed engine management system, which handles all control functions
on the engine; for example start sequencing, start blocking, fuel injection, cylinder balancing, knock control,
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 re-
dundancy.
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.
Figure 14.1
Architecture of UNIC C3
Short explanation of the modules used in the system:
Main Control Module. Handles all strategic control functions (such as start/stop sequencing 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. The safety module is the interface to the shutdown devices and
backup instruments.
ESM
Local Control Panel is equipped with push buttons and switches for local engine control, as well as
indication of running hours and safety-critical operating parameters.
LCP
Local Display Unit offers a set of menus for retrieval and graphical display of operating data, calculated
data and event history. The module also handles communication with external systems over Modbus
TCP.
LDU
Power Distribution Module handles fusing, power distribution, earth fault monitoring and EMC filtration
in the system. It provides two fully redundant 24 VDC supplies to all modules, sensors and control
devices.
PDM
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Product Guide Wärtsilä 34DF - 3/2012
Product Guide
14. Automation System
