The Allen-Bradley 5120P1B, which is also referred to as the 5120-P1B or 5120-P1-B spare part, is a pyramid integrator power supply with a B revision. It features two kinds of input, specifically 85 to 132 Volts AC, 5 Amps, and 170 to 264 Volts AC, 3 Amps, with both at a frequency of at 47 to 63 Hertz. The output of this pyramid integrator power supply is either a maximum of 170 W when running without a blower and 223 W if operators are using it with a blower. The 5120P1B pyramid integrator power supply also has maximum outputs of 5 Volts DC, 35 Amps, 12 Volts DC, 3 Amps, and -12 Volts DC, 1 Amps for the module power. Note that this discontinued spare part belongs to the PLC-5 control system, specifically a pyramid integrator system or the PLC-5/250 system. Its primary function is to provide power to the modules connected to a pyramid integrator chassis. You can install this pyramid integrator power supply at the left side of a pyramid integrator chassis, which has a dedicated double-wide slot at the left side.

The pyramid integrator system that the 5120P1B pyramid integrator power supply is part of is the biggest system under the PLC-5 series, as it is an advanced programmable controller that can handle multiple processes simultaneously and acts in a supervisory role when used together with other controllers. The components of a pyramid integrator system include an integrated power supply, such as the 5120P1B pyramid integrator power supply, a remote I/O processor, resource manager, logic processor, chassis, and communication interface (specifically 1771 I/O, Ethernet, OSI, DH and DH+, DECnet/OSI, and OSI (MAP).)