Allen BradleyAnalog Voltage Output Module — Bulletin 1771 I/O (PLC-5), 4 Isolated Channels, 12-Bit, ±10 V DC

Product Description

What this part is

The Allen-Bradley 1771-OFE1 is the voltage-output version of the 1771-OFE analog output module for the Bulletin 1771 I/O system used with PLC-5 controllers. It provides four individually isolated differential voltage outputs, each jumper-selectable for one of three ranges, and draws its power from the 1771 chassis backplane.

Specifications in practice

Outputs per Module: 4, individually isolated. Output Voltage Ranges: +1 to +5 V DC, -10 to +10 V DC, 0 to +10 V DC, selected per channel by configuration jumpers; shipped set to the +10 V position. Output Current: 10 mA maximum per channel.

Digital Resolution: 12-bit binary, 1 part in 4095. Data Format: BCD or 12-bit binary, with selectable scaling to engineering units. Accuracy: ±0.1% of full scale, ±1/2 LSD in BCD mode, ±1/2 LSB in binary mode, including linearity, gain and offset at 25 °C. Temperature Coefficient: ±50 ppm/°C of full-scale range.

Settling Time: 0.8 ms maximum for a resistive load. Internal Scan Rate: 8.0 ms for all channels with BCD data and scaling; 1.6 ms for all channels with binary data and no scaling. Output Capacitance: 0.01 µF. Output Impedance: less than 0.25 Ω, exclusive of contact wiring resistance. Output Overload Protection: all outputs protected against short-circuit load conditions for up to one minute.

Backplane Current: 1.50 A. Power Dissipation: 7.9 W. Thermal Dissipation: 26.9 BTU/hr. Isolation Voltage: tested to 850 V DC for 1 s.

Last State Outputs: jumper-selectable to minimum, middle or maximum of range, or hold last value, on loss of communication; shipped at MID. Indicators: green RUN, red FLT.

Operating Temperature: 0 to 60 °C (32 to 140 °F). Storage Temperature: -40 to 85 °C (-40 to 185 °F). Relative Humidity: 5 to 95%, non-condensing. Shock: 30 g operating, 50 g non-operating. Vibration: 2 g at 10–500 Hz.

Certifications (when product is marked): UL Listed Industrial Control Equipment; CSA certified Process Control Equipment, including Class I, Division 2, Groups A, B, C, D hazardous locations; CE; C-Tick; EEx.

Connections and mounting

Module Location: Bulletin 1771 I/O chassis, one slot, any I/O slot except the left-most. Field Wiring Arm: catalog number 1771-WC. Conductors: 12 gauge (4 mm²) maximum stranded copper wire, Belden 8761. Wiring Arm Screw Torque: 7–9 lb-in (0.8–0.7 N·m). Keying: between 10 and 12, and between 26 and 28. Enclosure Type Rating: none (open-style).

Quantity and configuration

One analog voltage output module, Series B.

Compatibility and replacement

Fits any Bulletin 1771 I/O chassis. Related current-output versions: 1771-OFE2 (+4 to +20 mA) and 1771-OFE3 (0 to +50 mA). Also written 1771OFE1 and 1771-OFE1/B.