Overview
The Allen-Bradley 1771-OFE1 is a four-channel isolated analog output module designed for the PLC-5 platform. This PLC 5 analog output module is a voltage version which converts 12-bit binary or 4-digit BCD (binary-coded decimal) values to analog signals using its 4 outputs. The module’s analog output ranges include +1 to +5 VDC; -10 to +10 VDC and 0 to +10 VDC. The 1771-OFE1 is part of the Allen-Bradley 1771 Universal I/O family and integrates seamlessly into PLC-5 automation systems requiring precise voltage control.
Key Features
- Four (4) individually isolated voltage output channels +/- 10 VDC
- Each channel is individually isolated, ensuring noise immunity and preventing cross-channel interference in demanding process environments
- Accuracy of +0.1% of full scale; +1/2 Least Significant Digit (LSD) when operating in BCD mode and +1/2 Least Significant Bit (LSB) when configured in Binary mode
- Internal scan rate of 8.0 ms for every channel utilizing Binary Coded Decimal (BCD) data and scaling and 1.6 ms for all channels using binary data and no scaling
- No external power supply required, it draws all operating power from the I/O chassis backplane while performing continuous diagnostics
Technical Specifications
- Module Type: Analog Voltage Output
- Number of Channels: 4 isolated
- Output Voltage Ranges: ±10 VDC, 0–10 VDC, +1 to +5 VDC (selectable per channel)
- Resolution: 12-bit
- Channel Isolation: 1000V differential
- Maximum Output Current: 10 mA per channel
- Backplane Current Draw: 1.50 Amperes
- Response Time (BCD, with scaling): 8.0 ms per channel
- Response Time (Binary, no scaling): 1.6 ms all channels
- Operating Temperature Range: 0 – 60 degrees C
- Input Power: 1.5A @ 5V DC
- Certifications: C-TICK, CE, CSA, MARINE, UL
- Series: B
Typical Applications
Peripheral devices such as motor speed controllers, valve positioners, recorders, or signal converters can be connected to the output. The 1771-OFE1 is commonly deployed in:
- Motor speed control and variable frequency drive (VFD) interfaces
- Analog valve positioning for process control
- Transducer and sensor signal conditioning
- Data acquisition and signal recording systems
- Process automation and batch control systems
Compatibility & Replacements
Compatible With
- Allen-Bradley Universal I/O Chassis 1771-A1B, 1771-A2B, 1771-A3B, or 1771-A4B
- PLC-5 controllers and platforms
- Allen-Bradley Remote I/O networks
- Block transfer programming for data transfer
Replaces / Drop-In Replacement For
- Allen-Bradley 1771-OFE (earlier revision; 1771-OFE1 is the current voltage output version)
- Other 4-channel analog output modules in legacy PLC-5 systems requiring identical form factor and mounting
Works With
- PLC-5 programming software and block transfer instructions
- Allen-Bradley Remote I/O communication protocols
- Binary and Binary Coded Decimal (BCD) data formats
- Universal I/O Chassis backplane architecture
