MITSUBISHI KAKOKI E-01T-4131, E-01T-4157, E-31N-4132, SR-21 8385 KOYO ELECTRONICS

These parts are modules from the Mitsubishi MELSEC-A series (a now-legacy, but highly reliable and still-maintained platform). The E-01T-4131 and E-01T-4157 are terminal boards, the E-31N-4132 is an interface module, and the SR-21 8385 is a power supply module. Together, they would form part of a control system for processes like sequencing, temperature control, or data acquisition.

• Type: Terminal Board (Terminal Block Unit).

• Description: This is a connector interface terminal board. It acts as the physical wiring endpoint between field devices (sensors, switches) and the electronic control module. The “4131” suffix typically denotes a specific pin configuration and connector type.

• Function: Provides screw terminals for secure wire connections, allowing the main control module to be easily disconnected for maintenance without rewiring.

• Common Use: Used with analog input/output modules (e.g., for thermocouples, RTDs, voltage/current signals) or digital modules in the MELSEC-A series.

• Type: Terminal Board (Terminal Block Unit) – High-density or Specialized Type.

• Description: Similar to the E-01T-4131 but with a different pin layout or connector specification (“4157”). The number change indicates a different wiring configuration, likely for a different type of signal or module.

• Function: Same core function as the 4131, but designed to pair with a different specific module in the series (e.g., a different channel count analog module or a communication module).

• Type: Interface Module or Main Unit.

• Description: This is likely a power supply and interface base unit for the MELSEC-A series. The “E-31N” suggests a form factor and power specification.

  • E-31N: Often denotes a 3-slot or specific size main base unit with an integrated power supply.

  • 4132: Specifies the voltage input (e.g., 100-240V AC, or 24V DC).

• Function:

  • Provides regulated DC power to the plug-in modules (CPU, I/O, special function modules) installed on it.

  • Contains the data bus that allows communication between modules.

  • Provides mounting and electrical interface for the other terminal boards (E-01T-xxxx).

• Type: Power Supply Module.

• Description: This is a 24V DC Output Switching Power Supply. Koyo (now part of JTEKT) is a known manufacturer of industrial electronic components.

  • SR-21: Likely the series/model.

  • 8385: Likely a variant specifying input voltage range (e.g., 85-264V AC wide-range input) and output current (e.g., 1.5A, 2.1A, etc.).

• Function: Converts AC line voltage (e.g., 100-240V AC) to a clean, stable 24V DC output used to power:

  • PLC CPUs and I/O modules (if the main base doesn’t have an integrated supply).

  • Sensors, actuators, relays, and other field devices in the control panel (the “24VDC control voltage” standard in industrial automation).

In a rack-based PLC system like the MELSEC-A, the components might be used as follows:

1. The Koyo SR-21 8385 power supply is mounted in the control cabinet and provides 24V DC power to the entire rack.

2. The Mitsubishi E-31N-4132 base unit is installed. It might use the 24VDC from the Koyo supply or have its own AC input.

3. Various I/O modules (e.g., an analog temperature input module) are plugged into slots on the E-31N base.

4. The Mitsubishi E-01T-4131 and E-01T-4157 terminal boards are attached to the front of their respective I/O modules. All field wiring is connected to these terminal boards.