Siemens SIMATIC S5 Manual

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Glossary9–5IP244C79000–Y8576–C858–02I Integral action of the controller.Integration time Duration for measuring the input voltage.Interpolation Determination of intermediate values on the basis of knownboundary values of an interval.L+ 24 V connection positive pole (load voltage).L– 24 V connection (reference point).Limitation value This value limits the influence of the master controller onsecondary controllers (in cascaded controls).Line break monitoring Monitors breaks in the wires to the temperature sensors(thermocouples or Pt 100) and initiates the change over to a safeoperating mode, e.g. by switching over to a stand-by sensor.Low byte Less significant byte (DR) of a 16-bit data word (DW).Lower setpoint Second setpoint, e.g. to allow for a lower temperature control atnight.Machine cycle A production cycle (e.g. time required to inject a plastic part).Main control byte 8-bit information unit to control the channel functions on themodule.Manipulated variable Y Percentage of the sampling time, obtained from the calculationsof the control algorithm (see ”Percentage output”).Manual manipulated Percentage time value for the operating time of the actuatorvariable YH output as value of manipulated variable when the controller isswitched off (manual operation).Manual operation The manipulated variable is not calculated by the controller (thecontroller is switched off), but is specified by the operator or userprogram as a percentage of the range of the manipulatedvariable.Master controller See ”Cascaded Control”.Message Here, a data record (data block) 31 bytes long (for parameters,measured values etc.).Mixed operation Here, simultaneous operation of normal and hot channelcontrollers.Multiplexer Switch to select and connect an analog input channel to the ADCand the module processor.Operating point The operating point is the required actual value which shouldremain the same during control operation or whose systemdeviation should become zero when using P controllers.