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Toshiba Corporation Power Supply 1-5VDC/4-20MA Distributors or Signal Isolator Modules
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Toshiba Corporation produces specialized loop-powered industrial instruments commonly referred to as Distributors or Signal Isolator Modules. These devices act as a transmitter power supply, delivering a 24VDC loop voltage to field instruments while simultaneously converting or isolating the analog input signals between 4–20mA current and 1–5VDC voltage.
Core Legacy Hardware
Depending on whether you are looking for a standalone panel module or a PLC expansion card, Toshiba provides two main options:
- Toshiba CDIS52 / CDIS1 Distributors: These are standalone, legacy DIN-rail style transmitter power supply modules. They supply 24VDC to drive 2-wire field transmitters, take the returning 4–20mA loop current, and output an isolated 1–5VDC analog signal to control systems.
- Toshiba Unified Controller nv Series / V Series Cards: If you are connecting directly to a Toshiba industrial controller rack, they use dedicated process I/O blocks—such as the Toshiba G2 Analog Input Modules (Model AD624 / GAD624)—which explicitly support software-configurable 1–5V and 4–20mA signals across 4 to 8 channels.
Signal Functionality
In industrial instrumentation, a 1–5VDC signal maps precisely to a 4–20mA current signal via a precision 250Ω resistor shunt:
- 1 VDC = 4 mA (Zero scale / Lower Range Value)
- 3 VDC = 12 mA (50% scale)
- 5 VDC = 20 mA (Full scale / Upper Range Value)
Toshiba Corporation Power Supply 1-5VDC/4-20MA Distributors or Signal Isolator Modules
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