Why the 1746-OV16 Still Earns Its Slot
Downtime on an SLC 500 line rarely waits for a purchase order. When a discrete output card fails, every hour of stalled production costs far more than the module itself. The Allen-Bradley 1746-OV16 keeps that math in your favor: sixteen sinking output channels in a single slot-width module, ready to drive the DC loads that keep a process moving.
This is a discrete output module from the SLC 500 series, manufactured by Allen-Bradley. It delivers a 10-50 VDC output range with a nominal 24 VDC, arranged as one group of sixteen channels. That density matters. Filling sixteen outputs from one slot preserves chassis space for the analog and specialty cards your application still needs.
Where the Cost Case Gets Strong
The 1746-OV16 carries a continuous current rating of 0.50 A per point at 30 °C (86 °F), dropping to 0.25 A at 60 °C (140 °F). Per module, that becomes 8.0 A at 30 °C and 4.0 A at 60 °C. For panel builders, this means fewer interposing relays on moderate DC loads, which trims wiring labor, terminal count, and enclosure footprint. Fewer components also means fewer failure points to chase later.
Surge current reaches 3.0 A per point for 10 ms, enough to absorb the inrush of relay coils and indicating devices without nuisance tripping. Maximum on-state voltage drop is 1.2 V at 0.5 A, so loads receive nearly the full supply voltage. Off-state leakage stays at 1 mA, and the minimum load current is also 1 mA.
Backplane current consumption is 0.270 A. Signal delay is 0.1 ms for the ON transition and 1.0 ms for OFF, with a step response of 60 milliseconds in and 2.5 milliseconds out. Heat dissipation is 0.388 W per point and 7.6 W total, a figure worth checking when you size enclosure cooling.
Practical Fit in Oil, Gas, and Factory Automation
The 1746-OV16 suits applications where DC-operated loads need reliable switching. Typical uses include energizing relay coils, pilot lights, and sounding devices on skids, pump stations, and process panels. The sinking wiring configuration pairs naturally with positive-common DC circuits common in these environments.
Because the module installs directly into a modular SLC 500 chassis, replacement is a slot-for-slot swap. The removable terminal block arrives pre-installed, and you can pull it free to rewire or modify connections without disturbing the rest of the rack. That shortens planned changeovers and unplanned repairs alike.
Buying Checklist Before You Commit
Confirm three things before ordering. First, verify your field devices are compatible with a sinking output configuration and fall within the 10-50 VDC range. Second, total your per-point and per-module current against the temperature-adjusted ratings above, not the 30 °C figures alone. Third, check that your chassis has a free single slot and that your backplane budget absorbs the 0.270 A draw.
If the load profile runs hot, consider whether ambient temperature pushes you toward the 60 °C derating. That single check prevents the most common cause of premature output failure.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. For teams that need spares when you need them, Oil AutoTech offers fast dispatch, worldwide, plus hands-on technical selection help to match the right module to your rack.
Contact Oil AutoTech today for pricing and availability.
