Allen-Bradley/Rockwell Automation 1771-OFE2 field wiring arm

The Allen-Bradley 1771-OFE2 is an analog output module from the 1771 Product family. It features Four (4) individually isolated analog output channels that delivers 4-20 mA output current signal. This module is typically used for controlling Final Control Elements (FCE) such as Variable Frequency Drives (VFD), Dampers, Louvers, Valves and other equipment and devices. It may also be used to implement the output of a Proportional + Integral + Derivative (PID) controller to implement automatic control of an analog loop. Additionally, this module may also be used to transmit signals to measuring, receiving and recording elements such as Signal Isolators, signal converters, panel meters, data loggers and other similar instruments.

Technical specifications for 1771-OFE2

ManufacturerRockwell Automation

Power Dissipation7.9 Watts

Part Number/Catalog No.1771-OFE2

Module TypeIndividually isolated analog output module

BrandAllen-Bradley

Series1771 Product Bulletin

No. of outputsFour (4) outputs

Output Current4-20 mA

Module location1771 I/O chassis

Module widthSingle slot

Digital resolution12-bit binary

Backplane power1.50 A

Thermal Dissipation26.9 BTU/hr

KeyingBetween 10 and 12; Between 26 and 28

Field Wiring ArmCat. No. 1771-WC

Wiring Arm Screw Torque7-9 inch-pounds

Number of I/O4 Isolated (1000 Volt) Differential

Data FormatNatural Binary or BDC Scaling to +/- 9999

Voltage RangeN/A

Current Range4-20 Miliamperes

Backplane Current1.5 Miliamperes

External PowerNone

Wiring Arm1771-WH

CoatingConformal Coat

Typical AC Signal Delay (Off)45 (+/- 15) ms

Typical DC Signal Delay (Off)50 ms

MountingRack Mountable

Indicators2 LED

The 1771-OFE2 is installed to any 1771 I/O chassis. It can serve as local and remote I/O module of a PLC 5 controller. It occupies a single slot of the chassis and uses the 1771-WC field Wiring arm. Each channels has rated isolation of 850 VDC for 1 Second while the Digital to Analog Converter (DAC) settling time is maximum of 0.8 ms. It has backplane current draw of 1.50 Amperes, power dissipation of 7.9 Watts, Thermal Dissipation of 26.9 BTU/hr and adjacent slot power maximum dissipation of 10 Watts. When wiring output devices to the channels of this analog output module, use 12 Gauge stranded or solid wire with insulation thickness of 3/64 inch or 1.2 mm. Recommended cable is Belden 8761. During installation to the chassis, ensure that module keying is set at 10 and 12 / 26 and 28. Tighten wire termination with force of 7-9 lbs/in.