Mitsubishi A1SJ51T64 I/O Link Master Module
The Mitsubishi A1SJ51T64 is an I/O Link master module designed for the MELSEC-A series programmable logic controllers. It serves as a communication bridge between the PLC CPU and remote I/O devices, enabling high-speed, reliable transmission of digital and analog signals across distributed control systems. The module is equipped with a dedicated 16-bit microprocessor and battery-backed RAM for large capacity memory and extended I/O control capability.
Technical Specifications
Product Type: I/O Link master module / main communication module
Series: MELSEC-A series
Controlled I/O Points: Up to 128 points (8-point I/O combination modules, up to 128 points; any I/O module, up to 64 points)
Processor: 16-bit dedicated microprocessor
Memory: Large capacity battery backup RAM
Input Points (as I/O module): 32 points
Input Voltage/Current: DC12/24V, 3/7 mA
Input Response Time: 10 ms
Common Configuration: 16 points per common side, positive pole sharing
Communication: I/O Link protocol
Rack Mounting: Main CPU rack (backplane mounting)
Status LEDs: Power, communication, error indication
Operating Voltage: 24 V DC
Manual: User's Manual (SH(NA)-080211)
Product Status: Discontinued (legacy product)
High-Speed Distributed I/O Control
The A1SJ51T64 implements the I/O Link protocol, enabling the PLC CPU to communicate with up to 128 remote I/O points distributed across a facility. This architecture significantly reduces field wiring compared to traditional centralized I/O systems. The module's dedicated 16-bit microprocessor offloads communication processing from the main CPU, ensuring deterministic response times and freeing CPU resources for user program execution. Battery-backed RAM preserves configuration and buffer memory during power interruptions, eliminating the need for reconfiguration after power cycles.
Flexible I/O Configuration
The module supports flexible system configuration using 8-point I/O combination modules (up to 128 points total) or any I/O module (up to 64 points). The I/O points can be distributed to control equipment where space is limited, ensuring that only the required I/O points are installed at each location. The module does not require termination resistors or T-branch connections, providing maximum wiring flexibility. For users requiring long-distance communication, an optional fiber optic cable extension is available.
Application Domains
The A1SJ51T64 is used in large-scale factory automation systems with distributed I/O cabinets, conveyor systems with multiple remote stations, process control applications where sensors are spread across large areas, and retrofit projects for legacy MELSEC-A series systems. It is also suitable for building automation and infrastructure monitoring systems requiring distributed I/O.
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