The GAC21 is the heart of the main electrical power distribution system. It optimizes power management and saves electrical energy in controlling all onboard generating plants on board vessels.

Both the hardware and software for the PLC conform to IEC61131, the international standard for programmable controllers. The PLC also conforms, as standard, not just to the IEC/JIS, but also to the CE marking/UL standard.

Processing speed : 70 ns
Program memory capacity: Multiple of 16k/32k
Number of input/output points : 8192 max.
Processing speed for dedicated bus : 25Mbps

The PLC constantly monitors the power, CPU, and signal transmission lines. If an error occurs, the error indicator on the malfunctioning module will light up, allowing you to identify the module very easily. The PLC is designed in modules, allowing you to replace any module easily in a short time.
Terasaki's multiple transmission system"TM", which has many records on uses, has been configured using loop topology. It covers data transmission between the switchboard, group starter panel, and integrated type engine monitoring system. It is also applicable to communication with the bridge if serial transmission is used. This allows personnel in the bridge to very easily monitor the status of the power distribution system.
The modules of the PLC are independent for each function. Therefore, if a failure occurs, it can be rectified by replacing only the module in question. This saves the maintenance cost.
The P-ROM containing the software for the PLC comes as a cartridge. Therefore, if any change is made to the software, the P-ROM can be easily changed for this purpose.
The settings for the automatic control of the generator can be changed easily using the handy type setting device (HT21-001).
The GAC21 may be located in a decentralized position for each generator, allowing you to control the generator independently. When used with Terasaki's watch-free system as the best combination, the GAC21 is applicable for a more advanced onboard LAN system.

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