3 Product Description  X-CPU 01 
Page 24 of 52  HI 801 009 E Rev. 4.00 
 
NOTE 
 
Module damage due to overtemperature! 
The HIMax modules may only be operated in conjunction with a X-FAN 01 Fan Rack 
or a replacement type. 
 
3.4.21 Operating System 
The operating system loaded into the CPU contains all basic functions of the HIMax 
programmable electronic system (PES), for example: 
  Processing the user programs, 
  Performing all test routines for hardware and software 
  Cycle time monitoring (watchdog) 
  Safe communication with the I/O modules 
  Safe communication with other systems, such as: 
- HIMax 
- HIMatrix 
  Creating and storing events. 
For a description of the operating system functions, see the System Manual (HI 801 001 E). 
Cycle Processing 
A CPU cycle runs through the following phases: 
  Reading the input data 
  Processing the user programs 
  Writing the output data 
  Other activities, e.g., reload processing.