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1790D-T8BV8B A-B CompactBlock LDX DeviceNet Base Module
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- Description 1790D-T8BV8B A-B CompactBlock LDX DeviceNet Base Module Product Dimensions： Product Description (Detailed Explanation) The 1790D-T8BV8B is a digital combination module that offers both inputs and outputs in a single, small-footprint housing. It features 8 Digital Inputs (24V DC) and 8 Solid-State Digital Outputs (24V DC Source). As part of the LDX (Low-profile Distributed eXtension) series, it is engineered for applications where space is at a premium and a full-sized rack-based I/O system is not required. The module connects directly to a DeviceNet network, allowing for decentralized control and reducing long-distance point-to-point wiring between field sensors/actuators and the main control cabinet. Product Parameters (Technical Specifications) Parameter Category Specification Network Protocol DeviceNet Input Type 8-Channel, 24V DC Sinking (Current Sinking) Output Type 8-Channel, 24V DC Sourcing (Solid-State) Voltage Range 10V to 30V DC Output Current Rating 0.5A per point (max. 4A per module) I/O Connection Removable Screw-type Terminal Block Communication Rate 125k, 250k, 500k bps (Auto-baud available) DeviceNet Current Draw Max. 50 mA Mounting DIN Rail or Panel Mount Indicators Module/Network Status LED, individual I/O LEDs Product Advantages (Key Benefits) Space-Saving Design: Its ultra-compact, low-profile form factor makes it ideal for mounting in small junction boxes or directly onto machinery. Integrated Diagnostics: Built-in LEDs provide instant visual status for each I/O point, significantly speeding up on-site troubleshooting. Cost-Efficient: Combines both inputs and outputs in one unit, reducing the total number of nodes required on the DeviceNet network and lowering hardware costs. Removable Terminals: The terminal blocks can be removed without disconnecting wires, allowing for fast module replacement without rewiring errors. Flexible Communication: Fully compatible with RSNetWorx for DeviceNet, providing easy configuration of node addresses and I/O mapping. Precautions (Important Notes) External Power Required: The DeviceNet cable powers the communication circuit, but a separate, external 24V DC power supply is required to power the I/O circuits and field devices. Current Limitation: Do not exceed the 0.5A per channel limit. For inductive loads (like large solenoids), ensure a flyback diode is used to protect the solid-state outputs from back-EMF. Network Termination: Ensure that the DeviceNet network is properly terminated with 121 $\Omega$ resistors at both ends of the trunk line to prevent signal reflection. Grounding: The DIN rail or panel must be properly grounded to ensure the module’s electromagnetic compatibility (EMC) and protection against static discharge. Node Addressing: Ensure the MAC ID (Node Address) is set correctly via the hardware switches or software before adding the unit to an active network to avoid address conflicts. Product Applications (Typical Use Cases) Material Handling: Controlling small conveyors, diverters, and sensors in sorting facilities. Packaging Machinery: Managing photo-eye sensors and small solenoid valves on automated wrapping or labeling lines. Assembly Stations: Interfacing with push-buttons, pilot lights, and limit switches on localized operator workstations. Robotic Cells: Providing localized I/O for end-of-arm tooling or peripheral safety sensors within a robot’s work envelope. HVAC Systems: Controlling fans and monitoring dampers in distributed building management systems. 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