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Allen Bradley PLC 3 1771-CH

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1771-CH

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The 1771-CH from Allen Bradley is a cable I/O chassis designed for flexibility in various PLC applications. This unit operates with an input voltage of 10 to 276 VAC and supports output voltage in the same range.

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Ships from Raleigh, NC
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Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All of our products come with DO Supply's 2-year warranty.
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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1771-CH

ManufacturerAllen Bradley
Product TypeCable I/O Chassis/Rack
Product LinePLC 3
Part Number1771-CH
Weight1.81 lbs (0.82 kg)
Backplane Current Requirement1.2 A at 5 VDC
Input Voltage10-276 VAC
Input Frequency47-63 Hz
Output Voltage10-276 VAC
Output Current per Point2 A max.
Isolation Voltage1500 V RMS
Input DelayON: 12 ± 7 ms, OFF: 20 ± 7 ms
Output Switching DeviceTriac
Output Leakage Current5 mA max.
Fuse Protection2 Amps fast-acting fuse per output
Status IndicatorsON/OFF indicator for each channel, "Fuse Blown" indicator
KeyingPlastic keying bands
Addressing Modes2-slot, 1-slot, ½-slot selectable
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The 1771-CH cable I/O chassis by Allen Bradley serves as a vital component in the PLC 3 series. It's built to handle both input and output voltages ranging from 10 to 276 VAC, accommodating a variety of applications. This device is compact and weighs only 1.83 lbs, which aids in installation considerations.

It requires a backplane current of 1.2 A at 5 VDC, ensuring stable operation and communication within a control system. The output is limited to 2 A maximum per channel, making it optimal for standard control tasks. Isolation is a key feature, with a rating of 1500 V RMS protecting the system from electrical disturbances. The design includes a notable input delay, requiring 12 ms (± 7 ms) for ON and 20 ms (± 7 ms) for OFF states, which can assist with timing in control sequences.

The outputs utilize Triac devices for switching, contributing to the robustness of the system. Leakage is minimal, capped at 5 mA, ensuring that the outputs do not compromise overall performance. Each output is equipped with a fast-acting fuse rated at 2 Amps for added protection against overloads.

For user feedback, there are ON/OFF indicators for each output channel and an alert for blown fuses, enabling quick troubleshooting. Keying is provided by plastic bands, simplifying setup, while the addressing modes are adaptable: selectable between 2-slot, 1-slot, and ½-slot configurations for ease of integration with existing systems.