Allen Bradley1771-OZLReed Relay Contact Output Module, 0-24 V DC, Form A Normally Open, 1771 I/O Chassis

Product Description

What this part is: Allen-Bradley 1771-OZL relay contact output module. Product Type: dry-reed relay contact output module for the 1771 I/O platform. Voltage Rating: 0 to 24 V DC. Relay Type: dry reed, hermetically sealed. Contact Configuration: Form A, normally open. Mounting Type: 1771 I/O chassis, single slot. Unit Quantity: 1 Pc. Decoding the designation: 1771 — the Allen-Bradley 1771 I/O platform, the rack-based I/O family served by PLC-2, PLC-3 and PLC-5 processors. OZ — the relay contact output group within that platform, where each point is a hard metallic contact rather than a solid-state switch. L — the low-voltage dry-reed execution, rated 0 to 24 V DC. Relay data: Relay Type: dry reed. Contact Configuration: Form A, normally open. Voltage Rating: 0 to 24 V DC. Enclosure: hermetically sealed relay capsules. Agency Certification: CSA certified; CSA Class I Division 2 Groups A, B, C and D certified; UL listed; CE marked. Load Type: resistive. What these specs mean in practice: Relay Type: dry reed. Reed relays are the fastest of the three relay technologies Allen-Bradley used in this range, well ahead of the electromechanical relays in the 1771-OW family and the mercury-wetted relays in the 1771-OX. That speed is what makes them the choice for low-voltage, low-power switching where a mechanical contact is still wanted. Enclosure: hermetically sealed. The sealed capsule keeps acid, ammonia, nitrogen and chlorine atmospheres away from the contact surfaces, which is what qualifies the module for noxious environments where an open electromechanical relay would corrode. Contact Configuration: Form A, normally open. A hard metallic contact carries no leakage in the off state, so the module drives high-impedance inputs, intrinsically safe interfaces and instrument circuits that a triac or transistor output would falsely hold true. Agency Certification: CSA Class I Division 2 Groups A, B, C and D. The module is certified for installation in that hazardous-location classification, which is a direct constraint on where a panel can be sited. Load Type: resistive. Contact life is quoted against resistive loads at the rated power. Mounting data: Mounting Type: single slot in a 1771 I/O chassis. Terminations: removable field wiring arm. Controller Platform: PLC-2, PLC-3 and PLC-5 processors using the 1771 I/O structure. Reference documentation: Rockwell publication 1771-TD181, 1771 Digital I/O Relay Contact Output Modules Product Data. Quantity and configuration: Unit Quantity: 1 Pc. One relay contact output module. Interchange guidance: Manufacturer Status: discontinued, 31 January 2021. Part Number: 1771-OZL. MPN Variants: 1771OZL, 1771 OZL. The 1771-OYL is the other dry-reed module in the range and shares the relay technology on a different rating. The 1771-OZ and 1771-OZC are relay contact output modules at higher voltage ratings, and the 1771-OX uses mercury-wetted relays with selectable DC surge protection, so all three are related modules rather than equals. Rockwell publishes IFM interface module solutions covering the 1771-OZL and the 1771-IBN.