Chapter 7. PID Built-In Function Block344 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C7.1 Operands of the PID Function7.1.1 Operands for LD Version of PID Function BlockParameter Description Allowed Types Allowed Operands Optional(????)Instance Variable name of the PIDParameter Block array, which contains user-configurable and internal parameters,described in Reference Array for the PIDFunction. Uses 40 words that cannot beshared.WORD R, L, P, Wand symbolicNoSP The control loop or process set point. Setusing process variable counts, the PIDfunction adjusts the output control variableso that the process variable matches the setpoint (zero error).INT, BOOL arrayof length 16 ormore, ConstantAll except S, SA, SB,and SCNoPV Process Variable input from the processbeing controlled. Often a %AI input.INT, BOOL arrayof length 16 ormoreAll except S, SA, SB,and SC, andconstantNoMAN While Power Flow is received, the PIDfunction block is held in manual mode. If noPower Flow is received the PID functionblock is in Auto mode.Power Flow NA NoUP While Power Flow is received, the ManualCommand is increased by 1 each userconfigured Sample Period.Power Flow NA NoDN While Power Flow is received, the ManualCommand is decreased by 1 each userconfigured Sample Period.Power Flow NA NoCV The control variable output to the process.Often a %AQ output.INT, BOOL arrayof length 16 ormoreAll except %S andconstantNo
