Allen-Bradley 1771-OAN PLC-5 AC Digital Output Module
The Allen-Bradley 1771-OAN, also cataloged as the 1771-OAN Digital Output Module, operates as a dedicated hardware component for high-density AC load control and signal switching within Allen-Bradley PLC-5 systems. The module provides 32 solid-state AC outputs partitioned into 4 isolated groups of 8 channels each, controlling solenoids, motor starters, and contactors across a operating voltage range of 80 to 265 VAC.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OAN |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 2.95 lbs (1.34 kg) |
| Dimensions | Standard 1771 I/O Single-Slot Module |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Backplane Current: 0.3 A at 5 VDC |
| Output Count | 32 High-Density AC Points (4 groups of 8) |
| Operating Voltage | 80 to 265 VAC (Nominal: 120/240 VAC, 47-63 Hz) |
| Output Current per Point | 1.0 A at 30 deg C / 0.3 A at 60 deg C |
| Output Current per Group | 2.0 A at 30 deg C / 0.6 A at 60 deg C |
| Output Current per Module | 8.0 A at 30 deg C / 2.4 A at 60 deg C |
| Product Line | Allen-Bradley PLC-5 1771 I/O Platform |
Backplane Bus & Deterministic Control
The 1771-OAN interfaces with the 1771 universal I/O chassis backplane, receiving bit-mapped output state commands directly from the PLC-5 processor over the parallel backplane bus during each I/O scan. The module incorporates optical isolation between backplane logic and field-side AC switching circuits to protect internal backplane communication lines from switching transients. Consistent firmware flash compatibility and signal latching logic ensure stable backplane bus communication velocity across complex PLC-5 chassis configurations.
Frequently Asked Questions
Q: What are the thermal derating restrictions on current capacity for the 1771-OAN module?
A: Current capacity derates with temperature: maximum continuous current per point is 1.0 A at 30 deg C (derating to 0.3 A at 60 deg C), while maximum module total current is 8.0 A at 30 deg C (derating to 2.4 A at 60 deg C).
Q: Can different AC supply voltages be used for the 4 groups on a single 1771-OAN module?
A: Yes, the 32 channels are split into 4 isolated groups of 8 points, allowing each group common to be powered from an independent AC voltage source within the 80 to 265 VAC range.
Field Installation Guidelines
- Power Isolation: Turn off chassis backplane power and field AC power before inserting or removing the module from the 1771 I/O rack.
- Keying Band Alignment: Ensure correct plastic keying bands are inserted into the 1771 chassis backplane connector to prevent accidental insertion of incorrect module types.
- Field Terminal Wiring: Connect AC field loads to the 1771-WN wiring arm attached to the chassis slot, maintaining separate power feeds for each 8-point common group.
- Fuse Protection: Install fast-acting external fuses on each group power lead to protect output switching triacs from overcurrent or short-circuit damage.
- Surge Suppression: Connect RC surge suppressors across inductive field loads (solenoids, contactor coils) to minimize electromagnetic interference and voltage spikes.
Allen-Bradley 1771-OAN PLC-5 AC Digital Output Module
Allen-Bradley 1771-OAN PLC-5 AC Digital Output Module
The Allen-Bradley 1771-OAN, also cataloged as the 1771-OAN Digital Output Module, operates as a dedicated hardware component for high-density AC load control and signal switching within Allen-Bradley PLC-5 systems. The module provides 32 solid-state AC outputs partitioned into 4 isolated groups of 8 channels each, controlling solenoids, motor starters, and contactors across a operating voltage range of 80 to 265 VAC.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OAN |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 2.95 lbs (1.34 kg) |
| Dimensions | Standard 1771 I/O Single-Slot Module |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Backplane Current: 0.3 A at 5 VDC |
| Output Count | 32 High-Density AC Points (4 groups of 8) |
| Operating Voltage | 80 to 265 VAC (Nominal: 120/240 VAC, 47-63 Hz) |
| Output Current per Point | 1.0 A at 30 deg C / 0.3 A at 60 deg C |
| Output Current per Group | 2.0 A at 30 deg C / 0.6 A at 60 deg C |
| Output Current per Module | 8.0 A at 30 deg C / 2.4 A at 60 deg C |
| Product Line | Allen-Bradley PLC-5 1771 I/O Platform |
Backplane Bus & Deterministic Control
The 1771-OAN interfaces with the 1771 universal I/O chassis backplane, receiving bit-mapped output state commands directly from the PLC-5 processor over the parallel backplane bus during each I/O scan. The module incorporates optical isolation between backplane logic and field-side AC switching circuits to protect internal backplane communication lines from switching transients. Consistent firmware flash compatibility and signal latching logic ensure stable backplane bus communication velocity across complex PLC-5 chassis configurations.
Frequently Asked Questions
Q: What are the thermal derating restrictions on current capacity for the 1771-OAN module?
A: Current capacity derates with temperature: maximum continuous current per point is 1.0 A at 30 deg C (derating to 0.3 A at 60 deg C), while maximum module total current is 8.0 A at 30 deg C (derating to 2.4 A at 60 deg C).
Q: Can different AC supply voltages be used for the 4 groups on a single 1771-OAN module?
A: Yes, the 32 channels are split into 4 isolated groups of 8 points, allowing each group common to be powered from an independent AC voltage source within the 80 to 265 VAC range.
Field Installation Guidelines
- Power Isolation: Turn off chassis backplane power and field AC power before inserting or removing the module from the 1771 I/O rack.
- Keying Band Alignment: Ensure correct plastic keying bands are inserted into the 1771 chassis backplane connector to prevent accidental insertion of incorrect module types.
- Field Terminal Wiring: Connect AC field loads to the 1771-WN wiring arm attached to the chassis slot, maintaining separate power feeds for each 8-point common group.
- Fuse Protection: Install fast-acting external fuses on each group power lead to protect output switching triacs from overcurrent or short-circuit damage.
- Surge Suppression: Connect RC surge suppressors across inductive field loads (solenoids, contactor coils) to minimize electromagnetic interference and voltage spikes.
