Allen-Bradley 1764-24BWA MicroLogix 1500 Controller Base Unit
Configured for discrete logic execution and field I/O control within Allen-Bradley MicroLogix 1500 architectures, the Allen-Bradley 1764-24BWA (1764-24BWA PLC Base Unit) provides direct physical/electrical execution. The base unit integrates 12 discrete 24 VDC inputs and 12 electromechanical relay outputs to control industrial actuators, solenoids, and motor contactors. An integrated line-level power supply accepts 120 VAC input power to energize internal processing electronics, onboard I/O circuits, and connected 1769 Compact I/O expansion modules across the backplane bus.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1764-24BWA |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.75 kg (1.65 lbs) |
| Dimensions | Compact MicroLogix 1500 base housing |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 120 VAC input power |
| Discrete Inputs | 12 points (24 VDC sink/source) |
| Output Type | 12 electromechanical relay outputs |
| Terminal Style | Screw terminal blocks |
| Mounting Type | DIN rail or panel mount |
| System Integration | MicroLogix 1500 base platform with 1769 I/O expansion bus |
Backplane Bus Communication & Deterministic Networking
The 1764-24BWA base unit serves as the physical and electrical foundation for the MicroLogix 1500 system, hosting the removable processor unit while providing backplane bus communication velocity across attached 1769 Compact I/O expansion modules. Onboard backplane bus control logic manages deterministic I/O scan updates between the central CPU and local discrete channels. Integrated noise suppression circuitry prevents backplane logic resets caused by inductive switching transients on adjacent relay channels, maintaining high firmware flash compatibility and stable execution during high-density I/O operations.
Frequently Asked Questions
Q: What power source is required to operate the 1764-24BWA base unit?
A: The base unit operates on a 120 VAC nominal primary power supply connected directly to the designated AC line terminals.
Q: What contact switching rating is supported by the 12 relay output channels?
A: The 12 electromechanical relay outputs provide Form A dry contacts capable of switching AC and DC load circuits up to individual channel thermal and current limits.
Q: Can additional I/O modules be attached to the 1764-24BWA base unit?
A: Yes, the base unit supports local I/O expansion via 1769 Compact I/O modules attached through the right-side backplane expansion connector.
Field Installation Guidelines
- Mount the 1764-24BWA base unit onto a standard 35 mm DIN rail or secure it to a grounded enclosure backpanel using mounting screws.
- Verify that line power is isolated before terminating 120 VAC primary supply conductors to the AC power input screw terminals.
- Wire 24 VDC discrete field input sensors and output load devices to the dedicated screw terminal blocks, observing correct polarity for DC sensor circuits.
- Connect the main cabinet protective earth bar to the base unit grounding terminal using a low-impedance copper grounding conductor.
- Apply 120 VAC line power and confirm that the unit status LEDs illuminate before snapping the processor module into the base unit slot.
Allen-Bradley 1764-24BWA MicroLogix 1500 Controller Base Unit
Allen-Bradley 1764-24BWA MicroLogix 1500 Controller Base Unit
Configured for discrete logic execution and field I/O control within Allen-Bradley MicroLogix 1500 architectures, the Allen-Bradley 1764-24BWA (1764-24BWA PLC Base Unit) provides direct physical/electrical execution. The base unit integrates 12 discrete 24 VDC inputs and 12 electromechanical relay outputs to control industrial actuators, solenoids, and motor contactors. An integrated line-level power supply accepts 120 VAC input power to energize internal processing electronics, onboard I/O circuits, and connected 1769 Compact I/O expansion modules across the backplane bus.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1764-24BWA |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.75 kg (1.65 lbs) |
| Dimensions | Compact MicroLogix 1500 base housing |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 120 VAC input power |
| Discrete Inputs | 12 points (24 VDC sink/source) |
| Output Type | 12 electromechanical relay outputs |
| Terminal Style | Screw terminal blocks |
| Mounting Type | DIN rail or panel mount |
| System Integration | MicroLogix 1500 base platform with 1769 I/O expansion bus |
Backplane Bus Communication & Deterministic Networking
The 1764-24BWA base unit serves as the physical and electrical foundation for the MicroLogix 1500 system, hosting the removable processor unit while providing backplane bus communication velocity across attached 1769 Compact I/O expansion modules. Onboard backplane bus control logic manages deterministic I/O scan updates between the central CPU and local discrete channels. Integrated noise suppression circuitry prevents backplane logic resets caused by inductive switching transients on adjacent relay channels, maintaining high firmware flash compatibility and stable execution during high-density I/O operations.
Frequently Asked Questions
Q: What power source is required to operate the 1764-24BWA base unit?
A: The base unit operates on a 120 VAC nominal primary power supply connected directly to the designated AC line terminals.
Q: What contact switching rating is supported by the 12 relay output channels?
A: The 12 electromechanical relay outputs provide Form A dry contacts capable of switching AC and DC load circuits up to individual channel thermal and current limits.
Q: Can additional I/O modules be attached to the 1764-24BWA base unit?
A: Yes, the base unit supports local I/O expansion via 1769 Compact I/O modules attached through the right-side backplane expansion connector.
Field Installation Guidelines
- Mount the 1764-24BWA base unit onto a standard 35 mm DIN rail or secure it to a grounded enclosure backpanel using mounting screws.
- Verify that line power is isolated before terminating 120 VAC primary supply conductors to the AC power input screw terminals.
- Wire 24 VDC discrete field input sensors and output load devices to the dedicated screw terminal blocks, observing correct polarity for DC sensor circuits.
- Connect the main cabinet protective earth bar to the base unit grounding terminal using a low-impedance copper grounding conductor.
- Apply 120 VAC line power and confirm that the unit status LEDs illuminate before snapping the processor module into the base unit slot.
