Allen-Bradley 1769-OF4CI CompactLogix Isolated Analog Output Module
Configured for precise final control element drive execution in CompactLogix architectures, the Allen-Bradley 1769-OF4CI (1769-OF4CI Isolated Analog Output Module) provides direct physical/electrical execution.
Suffix Breakdown & Model Matrix
| Base Catalog Number | Output Channels | Isolation Type | Supported Signal Ranges |
|---|---|---|---|
| 1769-OF4 | 4 Non-Isolated | Differential | 0 to 20 mA, 4 to 20 mA, 0 to 10 VDC, +/-10 VDC |
| 1769-OF4CI | 4 Individually Isolated | Channel-to-Channel | 0 to 20 mA, 4 to 20 mA |
| 1769-OF4VI | 4 Individually Isolated | Channel-to-Channel | 0 to 10 VDC, +/-10 VDC, 1 to 5 VDC |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-OF4CI |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.44 lbs (0.65 kg) |
| Dimensions | 118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | 165 mA @ 5.1 VDC backplane draw (2.0 W heat dissipation) |
| Output Channels | 4 Differential (Individually Isolated) |
| Analog Signal Ranges | 0 to 20 mA, 4 to 20 mA (Full scale: 0 to 21 mA, 3.2 to 21 mA) |
| Digital Resolution | 16 bits unipolar (0.323 uA/bit) |
| Conversion Rate | 110 ms |
| Resistive Load Range | 0 to 500 Ohms |
| Non-Linearity | +/-0.05% full scale |
| Power Supply Distance Rating | 8 Modules |
Channel-to-Channel Galvanic Isolation and Backplane Velocity
The 1769-OF4CI contains four individually isolated analog current channels designed to prevent ground loops and eliminate common-mode noise interference across remote actuators. Signal processing is governed by internal calibration hardware that automatically executes self-test algorithms upon power cycle, guaranteeing +/-0.05% non-linearity without requiring manual field calibration. Firmware flash compatibility and optimized backplane bus communication velocity ensure deterministic transfer of PID scaled data, raw values, and engineering units between the primary controller and field output circuits.
Frequently Asked Questions
Q: Does the 1769-OF4CI module require field calibration during routine maintenance?
A: No. The hardware design guarantees calibration accuracy (+/-0.35% full scale) and performs auto-calibration and self-test routines during every power cycle.
Q: What happens if an output loop experiences a short circuit?
A: The module includes built-in short circuit and excess voltage protection. It maintains operational integrity while limiting maximum short circuit current to approximately 21 mA.
Q: What wiring type is recommended for connecting current loops to the module terminal block?
A: Use Belden 8761 or equivalent shielded twisted-pair copper cable. Wire sizes should range between 22 to 14 AWG for solid wire or 22 to 16 AWG for stranded wire.
Field Installation Guidelines
- Mount the module onto a 35 mm DIN rail or attach directly to a subpanel using M4 screws. Verify the DIN rail maintains low impedance bonding to functional earth (FE).
- Ensure the module is installed within 8 slot positions of the system power supply (1769-PA2, 1769-PB2, 1769-PA4, or 1769-PB4) to satisfy the power supply distance rating.
- Handle the module within an ESD-safe workspace, avoiding direct physical contact with backplane connector pins or exposed circuit traces.
- Route 0-20 mA and 4-20 mA current loop wiring in dedicated low-voltage signal conduits separate from AC power cables and inductive load lines.
- Lock the adjacent backplane bus levers securely to ensure bus continuity before energizing the 24 VDC rack power supply.
Allen-Bradley 1769-OF4CI CompactLogix Isolated Analog Output Module
Allen-Bradley 1769-OF4CI CompactLogix Isolated Analog Output Module
Configured for precise final control element drive execution in CompactLogix architectures, the Allen-Bradley 1769-OF4CI (1769-OF4CI Isolated Analog Output Module) provides direct physical/electrical execution.
Suffix Breakdown & Model Matrix
| Base Catalog Number | Output Channels | Isolation Type | Supported Signal Ranges |
|---|---|---|---|
| 1769-OF4 | 4 Non-Isolated | Differential | 0 to 20 mA, 4 to 20 mA, 0 to 10 VDC, +/-10 VDC |
| 1769-OF4CI | 4 Individually Isolated | Channel-to-Channel | 0 to 20 mA, 4 to 20 mA |
| 1769-OF4VI | 4 Individually Isolated | Channel-to-Channel | 0 to 10 VDC, +/-10 VDC, 1 to 5 VDC |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-OF4CI |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.44 lbs (0.65 kg) |
| Dimensions | 118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | 165 mA @ 5.1 VDC backplane draw (2.0 W heat dissipation) |
| Output Channels | 4 Differential (Individually Isolated) |
| Analog Signal Ranges | 0 to 20 mA, 4 to 20 mA (Full scale: 0 to 21 mA, 3.2 to 21 mA) |
| Digital Resolution | 16 bits unipolar (0.323 uA/bit) |
| Conversion Rate | 110 ms |
| Resistive Load Range | 0 to 500 Ohms |
| Non-Linearity | +/-0.05% full scale |
| Power Supply Distance Rating | 8 Modules |
Channel-to-Channel Galvanic Isolation and Backplane Velocity
The 1769-OF4CI contains four individually isolated analog current channels designed to prevent ground loops and eliminate common-mode noise interference across remote actuators. Signal processing is governed by internal calibration hardware that automatically executes self-test algorithms upon power cycle, guaranteeing +/-0.05% non-linearity without requiring manual field calibration. Firmware flash compatibility and optimized backplane bus communication velocity ensure deterministic transfer of PID scaled data, raw values, and engineering units between the primary controller and field output circuits.
Frequently Asked Questions
Q: Does the 1769-OF4CI module require field calibration during routine maintenance?
A: No. The hardware design guarantees calibration accuracy (+/-0.35% full scale) and performs auto-calibration and self-test routines during every power cycle.
Q: What happens if an output loop experiences a short circuit?
A: The module includes built-in short circuit and excess voltage protection. It maintains operational integrity while limiting maximum short circuit current to approximately 21 mA.
Q: What wiring type is recommended for connecting current loops to the module terminal block?
A: Use Belden 8761 or equivalent shielded twisted-pair copper cable. Wire sizes should range between 22 to 14 AWG for solid wire or 22 to 16 AWG for stranded wire.
Field Installation Guidelines
- Mount the module onto a 35 mm DIN rail or attach directly to a subpanel using M4 screws. Verify the DIN rail maintains low impedance bonding to functional earth (FE).
- Ensure the module is installed within 8 slot positions of the system power supply (1769-PA2, 1769-PB2, 1769-PA4, or 1769-PB4) to satisfy the power supply distance rating.
- Handle the module within an ESD-safe workspace, avoiding direct physical contact with backplane connector pins or exposed circuit traces.
- Route 0-20 mA and 4-20 mA current loop wiring in dedicated low-voltage signal conduits separate from AC power cables and inductive load lines.
- Lock the adjacent backplane bus levers securely to ensure bus continuity before energizing the 24 VDC rack power supply.
