Mitsubishi A1SJ71QLP21 Network Module | High-Speed Optical Interface for MELSEC PLC
Mitsubishi Network Module A1SJ71QLP21
The Mitsubishi network module A1SJ71QLP21 supports SI/QSI/H-PCF/wide H-PCF optical cables for dual-loop PC networks (control station/normal station) and remote I/O networks (remote master station).
The purpose of switch control is to generate corresponding PLC outputs based on current input combinations and historical input sequences, enabling the system to operate in a predetermined order—often referred to as sequential control. Sequential control can be manual, semi-automatic, or automatic, with control principles including distributed, centralized, and hybrid modes.
Instruction execution time depends on user program length, instruction type, and CPU speed. In a typical scan cycle, fault diagnosis, communication, input sampling, and output refresh occupy relatively little time, while instruction execution takes the majority.
PLC response time, also known as lag time, is the interval from when an external output signal changes to when the controlled external output signal responds. This delay is caused by input/output circuit time constants, user program arrangement, PLC cyclic scanning, and I/O refresh methods—collectively referred to as the I/O delay time effect.
A Mitsubishi network module, the A1SJ71QLP21, supports SI/QSI/H-PCF/wide H-PCF optical cables for dual-loop PC networks (control/normal stations) and remote I/O networks (remote master stations). The purpose of discrete control is to generate corresponding PLC outputs based on current input combinations and historical input sequences, enabling sequential operation—also known as sequence control. This can be manual, semi-automatic, or automatic, with control principles including distributed, centralized, or hybrid approaches. Instruction execution time depends on program length, instruction type, and CPU speed. In a typical scan cycle, fault diagnosis, communication, input sampling, and output refresh take minimal time, while execution dominates. PLC response time, or lag time, refers to the interval between an external output signal change and the corresponding controlled output change. This delay, known as I/O delay time effect, results from input/output circuit time constants, program arrangement, cyclic scanning, and I/O refresh methods.
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