GE PACSystems RX7i Cpu Programmer's Reference Manual

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GE PACSystems RX7i Cpu Programmer's Reference Manual Manual pdf 262 page image

Chapter 5. Function Block Diagram (FBD)GFK-2950C February 2018 2475.6 Control FunctionsThe control functions limit program execution and change the way the CPU executes the applicationprogram.Function DescriptionDo I/O Interrupt. For one scan, immediately services a specified range of inputs oroutputs. (All inputs or outputs on a module are serviced if any reference locations onthat module are included in the DO I/O function. Partial I/O module updates are notperformed.) Optionally, a copy of the scanned I/O can be placed in internal memory,rather than at the real input points.For details, refer to Control Functions in Chapter 4.Mask I/O Interrupt. Mask or unmask an interrupt from an I/O board when using I/Ovariables. If not using I/O variables, use SVC_REQ 17: Mask/Unmask I/O Interrupt,described in Chapter 6.For details, refer to Control Functions in Chapter 4.Proportional Integral Derivative (PID) Control. Providestwo PID closed-loop control algorithms:Standard ISA PID algorithm (PID_ISA)Independent term algorithm (PID_IND)Note: For details, refer to Chapter 7.Service Request. Requests a special control system service.Note: For details, refer to Chapter 6.