Mitsubishi AY51 Transistor Output Module – High-Speed PLC I/O Module
Mitsubishi Transistor Output Module AY51
Mitsubishi transistor output module AY51: 32 output points, DC 12/24V, off-state leakage current 0.1mA, sink type transistor output, response time 2ms, 16 points per common terminal, 38-point terminal block, with surge absorber.
Each scan cycle: concentrated input sampling, output refresh.
Input refresh: when input port is closed, new input states during program execution are not read until the next scan.
Scan cycle consists of input sampling, program execution, output refresh.
Image register content changes during program execution.
Scan cycle length depends on: CPU instruction speed, instruction execution time, and number of instructions.
Due to centralized sampling and output, there is input/output response delay.
PLC selection: choose based on performance-to-price ratio and control requirements.
System program memory (ROM) stores system programs, management programs, and compilation programs. Used by manufacturer, unchangeable, data retained after power-off.
The AY51 is a Mitsubishi transistor output module with 32 sink-type outputs, rated for DC 12/24V, with an off-state leakage current of 0.1mA and a response time of 2ms. It features 16 points per common terminal, a 38-point terminal block, and built-in surge absorbers. The module operates with a cyclic scan process: input sampling, program execution, and output refresh are performed sequentially. Inputs are sampled only at the start of each scan, so state changes during program execution are not read until the next cycle. Outputs are refreshed after program execution. The scan cycle time depends on CPU speed, instruction execution time, and the number of instructions. This centralized I/O processing introduces input/output response delays. PLC selection should balance performance, functionality, and cost. System program memory is read-only, factory-stored, non-volatile, and contains management, monitoring, and interpretation programs.
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