Mitsubishi Input Module AX82 – High Reliability PLC Digital Input Module
Mitsubishi Input Module AX82
Mitsubishi Input Module AX82
●Input points: 64
●Voltage: DC 12/24V
●Current: 3/7 mA
●Response time: 10 ms
●Common terminals: 32 points per common
●Negative common
●Connector: 37-pin
System program memory stores system programs (management, monitoring, and interpretation/compliation of user programs). It consists of read-only memory, used by the manufacturer; contents cannot be changed and are retained when power is off.
PLC selection: As PLC technology evolves, different series and models offer varied performance, applications, and prices. Selection should balance control requirements with cost-effectiveness.
Scan cycle: Inputs are sampled collectively, outputs are refreshed collectively. During program execution, if input ports are closed, new input states are not read until the next scan cycle.
A scan cycle consists of: input sampling, program execution, and output refresh.
The contents of the image register change as the program executes.
Scan cycle duration depends on:
●CPU instruction speed
●Instruction execution time
●Number of instructions
Due to collective sampling and output, there is an input/output lag (response delay).
The Mitsubishi input module model AX82 features 64 input points, operating at a DC voltage of 12V or 24V, with a current consumption of 3mA or 7mA depending on the input voltage used. Its response time is 10 milliseconds, and it is designed with a common terminal configuration of 32 points per common, utilizing a negative common arrangement. The module is equipped with a 37-pin connector for external wiring.
System program memory is used to store the system program, which includes management programs, monitoring programs, and interpretive or compilation programs that process user programs. This memory is composed of read-only memory (ROM), which is pre-programmed by the manufacturer. Its content cannot be modified by the user and is retained even when power is disconnected.
In the context of PLC selection, as PLC technology continues to evolve, the variety and functionality of PLC products have expanded significantly, leading to broader application areas. Different series and models of PLCs have distinct performance characteristics, are suited to different application scenarios, and vary considerably in price. Therefore, when selecting a PLC, it is essential to consider the best cost-performance ratio while meeting the control requirements, ensuring a reasonable choice of PLC.
During each scan cycle, the PLC performs centralized sampling of input signals and centralized refreshing of output signals. In the input refresh process, when the input terminal is closed during the program execution phase, any new state at the input terminal cannot be read. The new state will only be read during the next scan cycle. A single scan cycle is divided into three stages: input sampling, program execution, and output refresh.
The content of the component image register changes dynamically as the program executes. The length of a scan cycle is determined by three factors: the speed at which the CPU executes instructions, the time required for each instruction itself, and the total number of instructions in the program.
Due to the adoption of centralized sampling and centralized output methods, there is a phenomenon of input/output lag, meaning that input and output response delays occur.
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