TOSHIBA USIO21

Description

Product Overview and Description

The TOSHIBA USIO21 is a versatile and compact universal digital I/O module designed for use with Toshiba’s industrial automation controllers, such as their V series PLCs. This module provides a flexible interface for connecting various field devices, allowing it to be configured as either an input or output on a per-point basis. The primary function of the TOSHIBA USIO21 is to offer a highly adaptable solution for machine control where the exact mix of digital inputs and outputs may vary or change over time, eliminating the need for separate dedicated input and output modules. This universal design simplifies spare parts inventory and provides greater flexibility during system design and modifications. Integration of the TOSHIBA USIO21 into a Toshiba PLC rack is straightforward, and its configuration is managed through Toshiba’s dedicated programming software, enabling engineers to tailor each channel to specific sensor or actuator requirements.

Product Parameters and Specifications

• Product Type: Universal Digital I/O Module (Configurable as Input or Output)

• Manufacturer Part Number (MPN): USIO21

• Brand: Toshiba

• Series: Compatible with Toshiba V Series PLCs and other Toshiba automation platforms.

• I/O Points: Typically 16 points, each individually configurable as input or output.

• Input Specifications (when configured as input):

  • Type: Sink or source, DC voltage (e.g., 24V DC).

  • ON Voltage/Current: Specified threshold (e.g., 15V DC min, 3mA min).

  • OFF Voltage/Current: Specified threshold (e.g., 5V DC max).

• Output Specifications (when configured as output):

  • Type: Transistor, sink or source (e.g., 24V DC).

  • Maximum Load Current: Per point rating (e.g., 0.5A).

  • Maximum Inrush Current: Specified short-duration rating.

• Isolation: Photocoupler isolation between the field side and the internal logic circuit.

• Response Time: Fast response time suitable for high-speed counting and control.

• Power Supply: External 24V DC field power supply required for the I/O circuits. Internal logic power drawn from the PLC backplane.

• Connections: Uses removable terminal blocks for easy wiring.

• Status Indicators: LED indicators for each channel showing ON/OFF status.

• Mounting: Mounts on a standard Toshiba PLC base unit or rack.

Key Advantages and Features

The most significant advantage of the TOSHIBA USIO21 is its universal channel configurability, which provides exceptional design flexibility and reduces the risk of I/O count errors during the planning phase. This feature allows for last-minute changes in machine design without requiring hardware modifications. The module offers high-density I/O in a compact form factor, saving valuable space in the control cabinet. Its fast response time makes it suitable for applications requiring quick reaction to sensor signals. The use of photocoupler isolation enhances noise immunity and protects the PLC’s internal electronics from electrical disturbances in the field. The module is designed for reliability and easy maintenance, with clear status LEDs for quick diagnostics. Integration within the Toshiba ecosystem ensures stable performance and straightforward configuration using familiar software tools.

Application Scenarios and Use Cases

The TOSHIBA USIO21 is ideal for applications with a dynamic or mixed I/O requirement. It is commonly used in small to medium-sized machinery such as test stands, assembly stations, and custom automation cells where the exact number of sensors and actuators might evolve. In packaging machinery, it can handle a mix of photoelectric sensor inputs and solenoid valve outputs on a single module. For material handling systems, it can be configured to manage both proximity switch inputs for position detection and output signals for controlling pneumatic diverters. It is also well-suited for prototype equipment and research & development setups where I/O needs are frequently changed. Any application where flexibility and adaptability in digital signal handling are prioritized over having dedicated, fixed-purpose modules is a strong candidate for the USIO21.

Comparison with Competing Products

The TOSHIBA USIO21 competes with other universal or configurable digital I/O modules from major PLC manufacturers, such as the Mitsubishi FX Series’ mixed I/O units, Siemens ET 200SP digital modules (DI/DO), Omron CJ Series Combo I/O Units, and Allen-Bradley Point I/O modules (1734-IB8 / OB8). Compared to standard fixed I/O cards, the universal module offers superior flexibility but may come at a slight premium per point. Versus other universal modules, the TOSHIBA USIO21 differentiates itself through its specific integration with Toshiba’s controller architecture and software environment. Its performance specifications, such as response time and isolation, are competitive within its class. The choice often depends on the existing PLC platform in use; for facilities standardized on Toshiba controllers, the USIO21 is the logical and supported choice for flexible digital I/O.

Selection Guidelines and Important Notes

Selection Advice:

1. Platform Compatibility: Confirm the TOSHIBA USIO21 is compatible with your specific Toshiba PLC CPU and base unit model.

2. I/O Mix Planning: Plan the required number of input and output points carefully. While flexible, the total is fixed (e.g., 16), so ensure the mix fits within the module’s capacity.

3. Load Current Verification: When configuring channels as outputs, ensure the connected load (e.g., solenoid, relay coil) does not exceed the module’s per-point and total current ratings. Use intermediate relays for higher current loads.

4. Field Power Supply: Provide a clean, regulated, and properly sized 24V DC power supply for the I/O circuits. This supply is separate from the PLC’s logic power.

5. Software Configuration: Remember that each channel’s function (input or output) is set in software, not by hardware. Accurate software configuration is critical for correct operation.

Important Precautions:

• Correct Wiring: Pay close attention to the wiring diagrams for sink/source configuration. Incorrect common wiring is a common source of module failure or malfunction.

• Fusing for Outputs: It is good practice to protect each output channel with an appropriately rated external fuse, especially when driving inductive loads.

• Inductive Load Protection: For DC output channels driving inductive loads like solenoids or relay coils, always use a flyback diode across the load to suppress voltage spikes and protect the output transistor.

• Noise Immunity: While isolated, for installations in high-noise environments, use shielded cables for long runs and follow proper panel grounding practices.

• Static Discharge: Handle the module with care, observing standard ESD (electrostatic discharge) precautions to prevent damage to internal electronics.

• Configuration Backup: Always back up the PLC program and I/O configuration. The universal nature of the module means its setup is stored in the software; losing this data would require reconfiguration.

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