Technical Specifications

Main Features and Advantages

High-density relay output architecture distinguishes the 1746-OW16 from lower-channel-count SLC 500 output modules. With sixteen independently controlled relay contacts organized into two groups of eight, the 1746-OW16 maximizes switching capacity within a single chassis slot, reducing module count and cabinet space requirements in control systems that command numerous discrete field devices. This density advantage is particularly valuable in machine control and facility automation applications where panel real estate is constrained.

Flexible voltage compatibility enables the 1746-OW16 to interface directly with a broad spectrum of field devices without external signal conditioning. The module’s relay contacts switch both AC voltages up to 265V and DC voltages up to 125V, allowing a single module to control 24V DC solenoids alongside 120V AC motor starters within the same rack. This eliminates the engineering overhead and component cost associated with interposing relays, simplifying system design and reducing potential failure points.

Galvanic isolation provides a critical safety and reliability advantage for the 1746-OW16. With 1500V AC optical isolation between the PLC logic circuits and output contacts, the module shields the SLC processor from voltage spikes, inductive kickback, and ground potential differences that can propagate from field wiring. Each output channel features an LED status indicator for real-time visual monitoring, enabling maintenance personnel to quickly identify active channels and diagnose faults without accessing programming software. The module also includes a removable terminal block (RTB) design that allows field wiring to remain terminated while the 1746-OW16 module is removed for replacement, minimizing downtime during maintenance operations.