Application Scenarios
Consider a small packaging machine in a food plant where the control panel runs on 120 VAC, the conveyor photo-eyes are 24 VDC NPN sensors, and the outputs drive a mix of 120 VAC solenoid valves and a small 24 VDC auxiliary relay. The engineering team chose the 1764-24BWA because one base unit covered all three electrical regimes: AC line power in, 24 VDC sink/source inputs for the sensors, relay outputs for the valves, and the onboard 24 VDC user-power output to energize the relay coil and the sensor common. No separate 24 VDC supply was needed, and the panel was built in a single day with one DIN-rail footprint.
In a second scenario, a system integrator maintaining a 15-year-old bottling line needed a drop-in spare for a failed base. The line’s program, HMI tags, and expansion I/O (1769 modules) were all tied to the MicroLogix 1500 architecture. Rather than rebuild the panel, the integrator sourced a tested 1764-24BWA from a specialist supplier, swapped it in under the existing wiring and program, and had the line running within the shift. The bottler’s maintenance manager later noted that keeping two tested spares on the shelf was cheaper than the downtime a single failed base had already cost them.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1764-24BWA (MicroLogix 1500 24-Point Base Unit) |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | Programmable Controller Base Unit (MicroLogix 1500) |
| Embedded I/O | 12 inputs / 12 outputs (24 points total) |
| Input Configuration | 8 standard 24 VDC inputs (terminals 0–7) + 4 fast 24 VDC inputs (terminals 8–11) |
| Input Circuit Type | 24 VDC, sink/source (jumper-selectable on terminals 0–7) |
| Input On-State Voltage | 14…30 VDC @ 30 °C (86 °F) ; 10…30 VDC for terminals 8–11 |
| Input Operating Voltage | 14…26.4 VDC @ 55 °C (131 °F) |
| Input Frequency Response | Terminals 0–7: 0…20 kHz ; Terminals 8–11: 0…1 kHz (scan-time dependent) |
| High-Speed Inputs | 4 channels @ 20 kHz |
| Output Type | 12 relay outputs (Form A, normally open), 2 isolated per unit |
| Relay Contact Rating | 24…125 VDC ; 120/240 VAC ; 2 A resistive @ 30 VDC or 250 VAC |
| Output Isolation | 2596 VDC |
| Input Isolation | 2145 VDC |
| User Power Output | 24 VDC @ 400 mA, 400 µF max — unique to the 1764-24BWA |
| Line Power | 85…265 VAC, 47…63 Hz |
| Power Consumption | 88 VA |
| Power Supply Inrush | 120 VAC: 25 A for 8 ms ; 240 VAC: 40 A for 4 ms |
| Power Supply Isolation | 2596 VDC |
| Communication Port | Channel 0, RS-232 (DF1 full-duplex, DH-485 half-duplex, ASCII, Modbus) |
| Compatible Processors | 1764-LSP (RS-232), 1764-LRP (RS-232 + Ethernet 10/100) |
| Expansion I/O | 1769 Compact I/O modules, up to 512 total I/O points |
| Real-Time Clock | 1764-RTC or 1764-MM1RTC (required for timed/date-stamped operations) |
| Memory Modules | 1764-MM1 / MM1RTC (8K), 1764-MM2 / MM2RTC (16K), 1764-MM3 / MM3RTC (16K, recipe data) |
| Maximum Expanded I/O | 512 points |
| Mounting | DIN rail or panel mount (horizontal orientation) |
| Terminal Screw Torque | 1.13 N·m (10 in-lb) rated ; 1.3 N·m (12 in-lb) maximum |
| Dimensions (H × W × D) | 138 × 150…190 × 87 mm (approx. 5.43 × 6.62 × 3.43 in) |
| Weight | Approx. 0.91 kg (2.00 lb) |
| Operating Temperature | 0…+55 °C (32…131 °F) ambient |
| Storage Temperature | –40…+85 °C (–40…185 °F) ambient |
| Operating Humidity | 5…95% relative humidity (non-condensing) |
| Vibration | Operating: 10…500 Hz, 5G, 0.015 in peak-to-peak ; Relay operation: 2G |
| Shock (panel mounted) | Operating: 30G ; Non-operating: 40G (without Data Access Tool) |
| EMC / Safety | UL 508, C-UL (CSA C22.2 No. 213), CE compliant, C-Tick, GOST-R, KCC |
| Hazardous Location | Class I, Division 2, Groups A/B/C/D |
| Marine / Other | ABS, BVS, DNV, GL, KRS, LR approvals ; SIL 2 capable (system-dependent) |
| Country of Origin | Singapore |
| UPC | 611320023619 |
| Lifecycle Status | Discontinued — Rockwell end-of-sale May 4, 2017 ; repair and functional replacement available |
| Standard Warranty | 1 year (new/manufacturer); surplus units carry seller warranty |
