Allen Bradley 1746-OA8 SLC I/O Digital Modules

The Allen-Bradley 1746-OA8 is an SLC 500 AC output module. This module is part of discrete output modules, used to energize electrical loads that operate at an operating voltage range of 85-264 VCA with frequency of 47-63 Hz. The module’s nominal output voltages are 120VAC and 240VAC and occupies a single slot of the 1746 chassis.

Each channel of the 1746-OA8 delivers a continuous output current of 1.0 A @ 30 °C (86 °F) or 0.50 A @ 60 °C (140 °F) while the maximum continuous output current per module is 8.0 A @ 30 °C (86 °F) and 4.0 A @ 60 °C (140 °F). Additionally, each channel has an ON signal delay of 1 ms for resistive load and maximum OFF delay signal of 11 ms for resistive load as well.

The 1746-OA8 draws backplane current amounting to 185 mA @ 5VDC with ON state output voltage drop of 1.50V @ 1.0 A. The module’s minimum load current is 10 mA with maximum OFF state leakage output current of 2 mA. The module’s maximum surge current per point is 10 A for 25 ms.

Technical specifications for 1746-OA8

ManufacturerRockwell Automation

Module TypeDiscrete AC output module

SeriesSLC 500

Part Number/Catalog No.1746-OA8

BrandAllen-Bradley

No. of groups2

No. of channels per group4

Nom Output Voltage120 / 240 VAC

Output Voltage Range85-264 VAC

Backplane current consumption185 mA

ON Signal delay, max. resistive load1 ms

OFF Signal delay, max. resistive load11 ms

Continuous current per point1.00 A at 30 °C (86 °F); 0.5 A at 60 °C (140 °F)

Continuous current per module8.0 A at 30 °C (86 °F); 4.0 A at 60 °C (140 °F)

On-state voltage drop, max1.5V at 1.0 A

Surge current per point10 A for 25 ms

Voltage Range85-265 Volts AC

Outputs8

Current/Output at 30 Celsius1 amp

Current/Output at 60 Celsius0.5 amp

Backplane Current (5 Volts)185 milliamps

Current/Module (30 Celsius)8 amps

ApplicationsGeneral Purpose

Step Response60 milliseconds in, 2.5 milliseconds out