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Allen-Bradley 1771-P4R PLC-5 Redundant Power Supply Module – Technical Specifications and FAQ
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley (Rockwell Automation) |
| Model | 1771-P4R |
| Product Type | PLC-5 Redundant AC Power Supply Module |
| Product Series | 1771 I/O |
| Function | Supplies DC power to the 1771 I/O chassis backplane |
| Nominal Input Voltage | 120 V AC |
| Input Voltage Range | 97–132 V AC |
| Input Frequency | 47–63 Hz |
| Input Current | Approx. 1 A |
| Output Voltage | 5 V DC |
| Maximum Output Current | 8 A |
| Redundancy Configuration | N+1 redundant power supply system |
| Maximum System Output at 60°C | 8 A (2-unit system); 14 A (3-unit system); 20 A (4-unit system) |
| Maximum Real Input Power | Approx. 59 W |
| Maximum Apparent Input Power | Approx. 92 VA |
| Maximum Transformer Load | Approx. 148 VA |
| Power Dissipation | 16 W maximum |
| Backplane Current | 300 mA at 5 V DC |
| Input Fuse | 1.5 A, 250 V, slow-blow |
| Alarm Relay Rating | 250 V AC, 1 A maximum |
| Mounting | One slot in 1771 I/O chassis |
| Compatible Chassis | 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, 1771-A4B |
| Wiring Requirement | Maximum 14 AWG |
| Operating Temperature | 0 to 60°C |
| Storage Temperature | -40 to 85°C |
| Relative Humidity | 5–95%, non-condensing |
| Dimensions (H × W × D) | Approx. 165 × 89 × 51 mm; chassis-mounted module envelope |
| Weight | Approx. 0.84–0.85 kg |
FAQ
FAQ
Q1: What is the Allen-Bradley 1771-P4R used for?
A: It is a redundant power supply module designed for PLC-5 systems. It provides 5 V DC power to the 1771 I/O chassis backplane.
Q2: What is the input voltage of the 1771-P4R?
A: It operates with a nominal input voltage of 120 V AC and accepts an input range of 97–132 V AC.
Q3: What is the output capacity of the 1771-P4R?
A: It provides 5 V DC output with a maximum current capacity of 8 A per power supply.
Q4: Does the 1771-P4R support redundant operation?
A: Yes. Multiple 1771-P4R modules can operate in an N+1 redundant configuration. A failed power supply can be compensated for by the remaining units, provided the system is correctly configured and within its rated capacity.
Q5: How many 1771-P4R modules can be used in a redundant system?
A: A redundant group can contain two, three, or four adjacent power supply modules. The maximum system output at 60°C is 8 A, 14 A, and 20 A respectively.
Q6: Which chassis are compatible with the 1771-P4R?
A: It is designed for compatible 1771 I/O chassis, including 1771-A1B, A2B, A3B, A3B1, and A4B. Series A chassis are not supported.
Q7: What are the dimensions and weight of the 1771-P4R?
A: Approximate dimensions are 165 × 89 × 51 mm (H × W × D), and the module weighs approximately 0.84–0.85 kg, excluding additional packaging.
Q8: Is the 1771-P4R still available?
A: No. Rockwell Automation discontinued the 1771-P4R on July 30, 2017. It may still be available through surplus inventory and industrial automation spare-parts suppliers.
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Packing & Delivery
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