Allen Bradley 1756-PB75 Standard DC power supply module

FAQ

Q1: What is the purpose of the 1756‑PB75 module?
It supplies DC backplane power to a ControlLogix chassis and its installed I/O modules.

Q2: What input voltage range does this power supply accept?
It operates from 18 V to 32 V DC with a nominal 24 V input.

Q3: How much output power does it provide?
It delivers up to approximately 75 W of total power to the chassis at 0 – 60 °C.

Q4: What output rails and currents are available?
It provides multiple backplane DC rails including 1.2 V, 3.3 V, 5.1 V, and 24 V with respective currents of ~1.5 A, ~4 A, ~13 A, and ~2.8 A.

Q5: Does this module have isolation protection?
Yes, it has reinforced insulation rated around 250 V continuous between the power input and backplane.

Q6: How long can it maintain output during brief input drops?
Hold‑up times are around 35–40 ms depending on input DC voltage level.

Q7: What chassis can it be installed in?
It fits the left‑side power slot of most Series B or C ControlLogix 1756 chassis such as A4, A7, A10, A13, or A17.

Q8: What are the size and weight of the module?
The unit measures approximately 140 mm × 112 mm × 145 mm and weighs about 0.95 kg.

1756-PB75 Allen Bradley

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