AL16AN Programmable Logic Controller Instruction ... - FF-Automation

AL16AN Instruction ManualPage 9-530/05/99A special program is provided for controllers. This AR program runs on IBM PC compatiblecomputers. The program simulates analog and three-point controllers. The controlleroperation can be monitored with "recorders", and the resulting graphs can be stored ondisk. The program is accompanied by an operating manual, which also contains generalinformation on controllers.The PLC programming program (ALPro) can also be used for monitoring controller variables,collecting historical data, and for documentation.9.5 Three-point controllersAll controllers also provide three-point control outputs in the form of bit data in registermemories R M 225 and 226.ControllerNo.12345678Close outputR M 225 bit01234567Open outputR M 226 bit01234567The pulse interval, i.e. the dead time that the controller will wait for the process responseto settle, is programmed into register memory R M 227. The time range is from 0.1 s to25.5 s, corresponding to the numbers 1 - 255. Register memory R M 224 is reserved forinternal use by the controller program.A typical application, controlling the temperature of the circulating water in a central heatingsystem, is illustrated on the next page.FF-Automation Oy