1790D-0W6 Relay Module 6-Output DeviceNet Base

Oiltech Controls ReviewThe Allen-Bradley 1790D-0W6 addresses a critical requirement in decentralized DeviceNet topologies by providing 6 fully isolated Form A relay contacts. This 1790D-0W6 configuration eliminates the constraints of shared commons, as each output point features its own dedicated COM path (1 point/1 COM). This architecture is vital for mixing AC and DC load voltages on a single physical block without introducing cross-phase interference. The engineering choice of a 37-pin D-shell connector minimizes wiring clutter, providing a robust plug-and-play matrix that speeds up cabinet deployment and field swaps.Technical Specifications MatrixRelay Architecture: 6 Form A contact channels configured as single-pole, single-throw (SPST) normally openDC Load Range: 5V DC to 28.8V DC delivering a maximum of 2.0 A resistive current capacityAC Load Range: 30V AC nominal delivering a maximum of 2.0 A resistive current capacityMinimum Conduction Threshold: Highly sensitive dry-contact switching down to 100 µA at 100 mV DCContact Impedance: Initial contact path resistance rated at a maximum of 30 mΩOn-State Voltage Drop: Maximum 0.5V drop measured at 2.0 A resistive load under 24V DCSwitching Lifetime Metrics: 300 Kcycles under full resistive loads; 100 Kcycles under inductive loadsOff-State Isolation Leakage: Maximum leakage current restricted to 1.5 mAContact Actuation Delays: Off to On propagation takes under 10 ms; On to Off takes under 10 msDeviceNet Bus Burden: Draws a maximum power dissipation of 1.2 W at 28.8V DC over an 11 to 28.8V DC spanField Supply Requirements: 24V DC nominal field bus with an operational voltage band of 19.2 to 28.8V DCField Channel Consumption: Active current draw of 10 mA per channel at 28.8V DCGalvanic Physical Isolation: Photocoupler isolation circuit tested at 1250V AC RMS from I/O to internal logicVisual Diagnostics: 6 green status LEDs mounted on the faceplate for instantaneous loop state verificationPhysical Termination: Industrial grade 37-pin D-shell connector ensuring locking vibration-proof connection pointsTarget System IntegrationInterlocking Safety Circuits: Safe isolation switching for master control relays and emergency stop loopsMotor Control Centers: Direct pilot duty excitation for size 1 through size 4 AC contactor coilsVariable Speed Drives: Delivering dry run/fault reset command signals to independent VFD terminal stripsProcess Heating Control: Driving small resistive heating elements and localized immersion heatersFacility Alarm Infrastructure: Activating heavy-duty multi-tone factory sirens and high-draw strobe arraysLogistics & Fulfillment OperationsDispatch Standard: Orders undergo testing and secure packing for shipment within 24 to 28 hoursGlobal Courier Network: Express air transit managed exclusively by premium carriers FedEx, UPS, and DHLHardware Guarantee: Full structural and operational protection backed by our 12-month warranty termsDirect Procurement Desk: Forward all enterprise RFQs and bulk pricing inquiries to [email protected] Engineering & Selection FAQQ: How do I select between the 1790D-0W6 relay block and a standard solid-state sinking module?A: Choose the 1790D-0W6 when your system requires true air-gap physical isolation, zero off-state voltage leakage, or the ability to switch low-voltage AC loads on the same block. If your application demands rapid duty-cycling under 10 ms, select a solid-state module instead to avoid mechanical wear.Q: What field installation practice prevents premature contact failure on the 1790D-0W6 when switching inductive coils?A: You must install external suppression directly across the load. Use an RC snubber network for AC inductive loads and a flyback diode for DC inductive coils to contain the inductive energy spike. For immediate circuit advice, contact us via WhatsApp at 86 158 8020 0923.Q: Can this module operate field devices if the DeviceNet network power supply drops offline?A: No, the module requires active DeviceNet bus power (11 to 28.8V DC) to energize the internal logic circuit and photocouplers, even if your 24V DC field power remains fully energized.Q: Why does the technical data specify a minimum load of 100 µA and 100 mV DC?A: This represents the wetting current required to pierce microscopic contamination layers on the silver alloy contacts. Operating below this threshold can result in unreliable contact closure readings in high-impedance instrumentation loops.Q: Is it permissible to route a 120V AC signal through these relay channels?A: No, the maximum voltage rating for the 1790D-0W6 contacts is strictly capped at 30V AC or 28.8V DC. Exceeding these limits violates safety isolation margins and risks arc-over damage across adjacent pins on the 37-pin D-shell connector.Copyright © 2026 Oiltech Controls Limited. https://www.oiltechcontrols.com/ All rights reserved.All rights reserved.