Power Supplies
Power SuppliesChoose from chassis-based and stand-alone power supplies for your PLC-5 system.
Chassis-based Power Supplies
The power supply modules are used in 1771 Universal I/O chassis to provide 5V DC power directly to the chassis backplane. These power supplies occupy one or two slots and can provide up to 8 A per supply to the I/O chassis. Power supply modules can be paralleled to provide up to 20 A per chassis @ 60 °C (or up to 24 A per chassis at 55 °C). Refer to the power supply selection chart for compatibility information.
Benefits
- Require no space outside the I/O chassis.
- Connect directly to the I/O chassis backplane.
- Contain output-power indicators that indicate if 5V DC is being supplied to the backplane.
- Can be paralleled (using 1771-CT cable) to provide up to 16 A of current per chassis (1771-P4S, -P6S, -P4S1, -P6S1).
- Single failure-proof chassis power of up to 20 A of current per chassis using redundant configurations (1771-P4R, -P6R).
Typical Configurations
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Stand-alone Power Supplies
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Allen-Bradley stand-alone power supplies provide DC voltages as noted. The 1771-P7 and -PS7 power supplies provide 5V DC to power 1771 I/O chassis for installed processors or adapters and I/O modules. The 1771-PS7 power supply additionally provides 5V, ±15V, and 24V DC user power. The 1794-PS1 power supply provides 24V DC for a FLEX I/O adapter and its I/O modules.
Benefits
- Various output current ranges to meet different power supply needs.
- Mounted along side an I/O chassis, these supplies do not require I/O chassis slots.
Typical Configuration
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Product Selection
| Cat. No. | Input Voltage, Nom. | Cabling | Paralleled | Input Voltage Range |
Real Input Power, Max. |
Apparent Input Power, Max. | Xformer Load, Max. | User Output Current |
| 1771-P4S | 120V AC | 1771-CT | -LSP, -LWP, -XP, -ZP, P4S |
97…132V AC | 59 W | 89VA | 148VA | — |
| 1771-P5 | 24V DC | 1771-CT | -P10, -P5 | 20.5…30V DC | 57 W | — | — | — |
| 1771-P5E | 24V DC⋆ | 1771-CT | -P10, -P5 | 20.5…30V DC | 57 W | — | — | — |
| 1771-P4S1 | 100V AC | 1771-CT | -P4S1 | 85…120V AC | 56 W | 89VA | 140VA | — |
| 1771-P6S1 | 200V AC | 1771-CT | -P6S1 | 170…240V AC | 56 W | 89VA | 140VA | — |
| 1771-P4R | 120V AC | Redundancy cable for P4R included | — | 97…132V AC | 59 W | 92VA | 148VA | — |
| 1771-P6R | 220V AC | Redundancy cable for P6R included | — | 194…264V AC | 59 W | 92VA | 148VA | — |
| 1771-P6S | 220V AC | 1771-CT | -P6S, -LWP, -LZP, -LXP | 194…264V AC | 56 W | 89VA | 140VA | — |
| 1771-P7 | 120V AC or 220V AC |
1771-CP1 Local 1771-CP2 Remote 5 ft 1771-CP3 Remote 5 ft |
— | 97…132V AC 195…264V AC |
108 W | 176VA | 270VA | — |
| 1771-PS7 | 120V AC or 220V AC |
1771-PSCC Remote 5.5 ft | — | 97…132V AC 195…264V AC |
171 W | 257VA | 427VA | 8 A @ 5V DC 2 A @ 15V DC 2 A @ -15V DC 2.5 A @ 24V DC |
| 1771-P10 | 125V DC | 1771-CT | -P5, -P10 | 97…145V DC | 51 W | — | — | — |
| ⋆ Has selectable power-loss time delay. | ||||||||
Specifications
| Cat. No. | Backplane Output Current |
Frequency | Fuse | Dimensions (WxHxD), Approx. | Weight | Location | Keying |
| 1771-P4S | 8 A @ 5V DC | 47…63 Hz | 1.5 A, 250V, slow-blow | 1 chassis slot | 0.9 kg (2 lb) | 1771 chassis, 1 slot | — |
| 1771-P5 | 8 A @ 5V DC | DC/Rect sine | 5 A, 32V, normal-blow | 2 chassis slots | 1 kg (2.3 lb) | 1771 chassis, 2 slots | 12 and 14 22 and 24 |
| 1771-P5E | 8 A @ 5V DC | DC/Rect sine | 5 A, 32V, normal-blow | 2 chassis slots | 1 kg (2.3 lb) | 1771 chassis, 2 slots | 12 and 14 22 and 24 |
| 1771-P4S1 | 8 A @ 5V DC | 47…63 Hz | 1.5 A, 250V, slow-blow | 1 chassis slot | 0.9 kg (2 lb) | 1771 chassis, 1 slot | — |
| 1771-P6S1 | 8 A @ 5V DC | 47…63 Hz | 1.5 A, 250V, slow-blow | 1 chassis slot | 0.9 kg (2 lb) | 1771 chassis, 1 slot | — |
| 1771-P4R | 8 A @ 5V DC | 47…63 Hz | 1.5 A, 250V, slow-blow | 1 chassis slot | 0.9 kg (2 lb) | 1771 chassis, 1 slot | — |
| 1771-P6R | 8 A @ 5V DC | 47…63 Hz | 1.5 A, 250V, slow-blow | 1 chassis slot | 0.9 kg (2 lb) | 1771 chassis, 1 slot | — |
| 1771-P6S | 8 A @ 5V DC | 47…63 Hz | 1.5 A, 250V, slow-blow | 1 chassis slot | 0.9 kg (2 lb) | 1771 chassis, 1 slot | — |
| 1771-P7 | 16 A @ 5V DC | 47…63 Hz | 3 A, 250V, normal-blow | 115 x 317 x 160 mm (4.5 x 12.4 x 6.3 in) |
1.9 kg (4.3 lb) | Stand-alone | — |
| 1771-PS7 | 16 A @ 5V DC⋆ | 47…63 Hz | 3 A, 250V, normal-blow | 115 x 317 x 160 mm (4.5 x 12.4 x 6.3 in) |
2.9 kg (6.5 lb) | Stand-alone | — |
| 1771-P10 | 8 A @ 5V DC | DC/Rect sine | 1.5 A, 32V, slow-blow | 2 chassis slots | 1.2 kg (2.6 lb) | 1771 chassis, 2 slots | 12 and 14 20 and 22 |
| ⋆ Total output power (including user) is 100W max. | |||||||
Power Requirement and Transformer Sizing
Each AC-input power supply generates a shutdown signal on the backplane whenever the AC line voltage drops below its lower voltage limit. It removes the shutdown signal when the line voltage comes back up to the lower voltage limit. This shutdown is necessary to help ensure that only valid data is stored in memory.
The external transformer rating (in VA) of each power supply is greater than its real input power (in Watts) because a capacitor-input AC/DC supply draws power only from the peak of the AC voltage wave form. If the transformer is too small, it clips the peak of the sine wave; when the voltage is still above the lower voltage limit, the power supply will sense this clipped wave form as low voltage and could prematurely shut down modules in the chassis.
In the following graphs, the backplane current load is displayed on the vertical axis.
For the DC-input power supply, the input real power is displayed in watts. For each AC-input power supply, the input real power is displayed in watts, apparent power in VA, and the transformer load in VA, each in a separate graph.
- Use the real power value in watts for determining the amount of heat dissipation inside the enclosure.
- Use the apparent power value in VA for estimating power cost.
- Use the transformer load value in VA of each power supply plus all other loads on a transformer to determine the required transformer size.
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