The 1769-PB2 (1769-PB2) is a high-reliability DC expansion power supply module designed for the Allen-Bradley CompactLogix and MicroLogix 1500 controller families. This module is essential for systems where the primary controller's power capacity is exceeded or when creating additional distributed I/O banks via expansion cables. It converts a 24V DC field input into regulated backplane power, ensuring stable operation for logic circuits and communication bus signals.
Engineered with reinforced insulation, the 1769-PB2 (1769-PB2) provides superior electrical separation between the DC input source and the sensitive internal backplane. This isolation prevents external noise, grounding disturbances, and surge transients from affecting CPU performance or I/O data integrity. With a distance rating of 8 modules per side, it offers the flexibility needed for high-density industrial control cabinets and multi-rack architectures.
The following specifications define the electrical and environmental parameters for the 1769-PB2:
Manufacturer: Allen-Bradley / Rockwell Automation
Model Number: 1769-PB2
Product Type: DC Expansion Power Supply
Input Voltage Range: 19.2 to 31.2 V DC
Nominal Input Voltage: 24 V DC
Power Consumption: 50 VA @ 24 V DC
Backplane Output (5.1V DC): 2.0 Amps
Backplane Output (24V DC): 0.8 Amps
Maximum Power Dissipation: 7.5 Watts @ 60 °C
Maximum Inrush Current: 30 Amps @ 31.2 V DC
Power Supply Distance Rating: 8 modules (Left or Right side)
Isolation Voltage: 75V continuous (Tested at 1697V DC for 1 second)
Internal Protection: Non-replaceable fuse (Wickmann 19193-6.3A / Littelfuse 021706.3MXP)
Terminal Wiring: 14 AWG (2.5 mm²) solid copper rated for 90 °C
Operating Temperature: 0 to 60 °C (32 to 140 °F)
Mounting Options: DIN Rail or Panel Mount
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