A programmable controller device has a main body with a CPU unit and I/O units connected by a bus line and a power unit for supplying power to the main body. The CPU unit has a memory with a user access area which is accessible by instruction of user program. The power unit generates status data related...http://www.google.se/patents/US7856278?utm_source=gb-gplus-sharePatent US7856278 - Programmable controller device
