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

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Page 9-630/05/99AL16AN Instruction ManualThe mixing valve is controlled by pulses driving the actuator motor. The dead time in anapplication of this kind can be several seconds, as a change in the water temperature willnot be immediately felt by the sensor. It is pointless to give further drive pulses to thevalve before the settled effect of the previous action is known. The dead time can be accountedfor when tuning the controller by means of the step response method.Example Temperature control of circulating water by 3-point control.Desired value R I 002Actual value R I 001Mixing valveBoilerO 001 'open'O 002 'close'Logic program for water heating:STR R C 050 ; Integration time (50/255*1500 s)EQ R M 140STR R C 002 ; Differentiation timeEQ R M 139STR R C 110 ; Gain (110/255*2)EQ R M 141STR R I 002 ; Set point, e.g. from a potentiometerEQ R M 138STR R I 001 ; Actual value from temperature sensorEQ R M 137STR R C 001 ; Keep controller in automatic modeEQ R M 136STR R C 010 ; Pulse interval 1 sEQ R M 227STR R M 226 ; Read 'open' bitsBIT M 020 ; Convert to bits (controllers 1 - 8)STR M 021 ; Use bit for controller 2EQ O 001 ; to open valveSTR R M 225 ; Read 'close' bitsBIT M 020 ; Convert to bitsSTR M 021 ; Use bit for controller 2EQ O 001 ; to close valveSTOPFF-Automation Oy
AL16AN Instruction ManualPage 10 - 130/05/9910. DATA COMMUNICATIONSThe AL 16AN board has an RS-232C level connector for data communication (a 9-pinDIN type connector) and parallel with it a module isolated RS485 connector (J400). Thedata communication operating mode is determined by means of a DIP switch and registermemories. The used connector (J101/J400) is selected with jumper. The switchescan be set to override the effect of the register memories.Refer to Chapter 4. SWITCHES.BATJ12J8SW1J101IC4J9IC1RS485 moduleJ40010987Register memory Effect AlternativesR M 215 Operating mode 0 = programming device1,2 = terminal / printout4 = MODBUS computer bus (slave)2 or 4 = modemR M 229 Baud rate 0 = 300 Bd1 = 1200 Bd2 = 2400 Bd3 = 4800 Bd4 = 9600 Bd6 = 28800 BdThe following items should be checked, if serial communication is not working:Settings of DIP switchSetting of R M 229Setting of R M 215Setting of DIP switch 2( R M 229 setting is active only if swithces 3 and 4 are in 'on' position)( Be sure that the baud rate is correct)( Check that operating mode is correct)( DIP switch 2 selects if the serial connection is used for communicationor for programming)( Check that you connected the wires correctly)( If CNV-1 is used)Cable connectionsCNV-1 jumpersModem settings and connections, if one is usedSubstation's address ( In R M 243, address is decimal number)FF-Automation Oy
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AL16AN Programmable Logic Controller Instruction ... - FF-Automation

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