High-Performance Mitsubishi Q4ACPU PLC CPU Unit – Reliable Automation Control Module
Mitsubishi CPU Unit Q4ACPU
The Mitsubishi CPU unit Q4ACPU features:
●I/O points: 4096
●I/O device points: 8192
●Program capacity: 124k
●LD instruction execution speed: 0.075 μs
Execution time depends on program length, instruction type, and CPU speed. In a scan cycle, fault diagnosis, communication, input sampling, and output refresh take little time, while instruction execution dominates.
An optocoupler consists of two LEDs and a phototransistor. The LED converts input electrical signals into light, and the phototransistor conducts when illuminated, with conduction proportional to light intensity. In the input interface circuit, a closed switch turns on the LED and phototransistor, sending a signal to the internal circuit; an open switch turns them off. This converts external switch signals into digital signals the PLC can process.
User program storage capacity is measured in words or K words (1 word = 16 bits, 1K = 1024 words). Simple logic instructions use 1 word each; timer/counter and shift instructions use 2 words; data operation instructions use 2–4 words.
The Mitsubishi Q4ACPU CPU module features 4096 I/O points, 8192 I/O device points, a program capacity of 124k steps, and a basic instruction (LD) processing speed of 0.075 μs. Execution time accounts for the majority of a scan cycle, while fault diagnosis, communication, input sampling, and output refresh take less time. A photoelectric coupler consists of two LEDs and a phototransistor. The LED converts input electrical signals into light, and the phototransistor conducts under illumination, converting external switch signals into digital signals for the PLC. In linear operation, the output signal is linearly related to the input. User program storage capacity is measured in words or K words (1 word = 16 bits, 1K word = 1024 words). Logic instructions typically occupy 1 word, timer/counter and shift instructions 2 words, and data operation instructions 2 to 4 words.
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