A9GT-70KBF MITSUBISHI

A9GT-70KBF MITSUBISHI Digital Input Module

Product  Description：

Mitsubishi Electric Digital Input Modules are fundamental components of the MELSEC PLC ecosystem. They act as the "eyes" of the control system by detecting discrete (ON/OFF) signals from field devices. These modules convert high-voltage or low-voltage electrical signals from the plant floor into logic-level data that the PLC’s central processing unit can interpret. Whether sensing the position of a mechanical arm or the press of an emergency stop button, these modules provide the essential feedback required for automated decision-making.

Product Parameters

The technical specifications of Mitsubishi Digital Input Modules are designed to accommodate a wide variety of industrial switching standards:

• Input Voltage Options: Available in 24V DC (most common for sensors), 100-120V AC, and 200-240V AC for direct connection to line-voltage switches.

• Input Type: Features both "Sink" (NPN) and "Source" (PNP) wiring configurations, often selectable via wiring or module model.

• Point Density: Scalable configurations offering 8, 16, 32, or 64 points per module to match the complexity of the machine.

• Input Current: Typical rated input current ranges from 4mA to 6mA per point at 24V DC to ensure low power consumption while maintaining signal integrity.

• Response Time: Configurable hardware and software filters allow for ultra-fast response times, typically adjustable from 0.1ms to 70ms to prevent signal "chatter."

• Insulation Strength: Equipped with photocoupler isolation rated at 2500V AC to protect internal PLC circuitry from external electrical spikes.

Product Advantages

Mitsubishi’s digital input technology is preferred in high-stakes manufacturing due to several key performance factors:

• High Noise Immunity: The integration of robust optical isolation and sophisticated input filtering ensures that the PLC does not register "ghost" signals caused by electromagnetic interference from nearby motors or contactors.

• Visual Diagnostics: Each input point is paired with a dedicated LED indicator on the front panel, allowing maintenance personnel to immediately verify the physical state of sensors without using a laptop.

• Space Efficiency: High-density 64-point modules utilize compact 40-pin connectors, allowing for hundreds of inputs to be managed within a very small control cabinet footprint.

• Intelligent Filtering: Users can programmatically adjust the "noise filter" settings for each input, allowing the system to distinguish between a valid high-speed pulse and a brief electrical surge.

• Simplified Maintenance: Many modules feature removable terminal blocks, allowing for the rapid replacement of a module without the need to disconnect and reconnect individual field wires.

Product Applications

Digital input modules are utilized across all stages of automated production and safety monitoring:

• Limit Sensing: Detecting the end-of-travel for pneumatic cylinders, motorized gates, and robotic axes.

• Operator Interface: Receiving commands from physical pushbuttons, selector switches, and foot pedals located on the factory floor.

• Safety Monitoring: Interfacing with light curtains, door interlocks, and E-stop relays to ensure the system halts during a safety breach.

• Product Presence Detection: Using photoelectric or inductive proximity sensors to confirm the arrival of a part on a conveyor belt.

• Level and Pressure Switching: Receiving discrete signals from float switches and pressure switches to trigger tank filling or system alarms.

Important Precautions

To ensure long-term reliability and avoid hardware failure, the following precautions should be followed:

• Polarity Consistency: When wiring DC sink or source modules, ensure the common (COM) terminal is connected to the correct pole of the power supply. Reversing the polarity on certain models can prevent any signals from being detected or cause damage.

• Voltage Matching: Never apply AC voltage to a DC-rated input module. This will result in immediate and permanent failure of the photocoupler components.

• Cable Length and Routing: For high-speed inputs, keep cable lengths as short as possible. Avoid routing input signal wires parallel to high-current AC power lines to prevent inductive coupling.

• Contact Bounce Management: For mechanical switches that exhibit significant "bounce," increase the input filter timer in the PLC parameters to ensure the CPU only registers a single stable transition.

• Wire Ferrules: Always use crimped ferrules on stranded wires when using screw-type terminal blocks to prevent stray strands from causing short circuits between adjacent input points.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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