Implementing 3-Switch XOR Ladder Logic with Internal Bit
Implement a 3-SPST switch XOR light circuit in LogixPro or RSLogix 500 using an internal relay bit. Includes truth tables, boolean equations, and verified.
The Allen-Bradley 1766-L32BWA is a MicroLogix 1400 32-point programmable controller with integrated digital I/O and Ethernet communication.
This configuration provides 20 digital 24 VDC inputs and 12 relay outputs. The inputs include 12 high-speed channels and eight standard channels.
The controller uses a 100 to 240 VAC power supply and provides an isolated 24 VDC sensor power output. The MicroLogix 1400 platform includes 20 KB of memory, online editing, data logging, recipe storage, and expansion support.
Integrated communication includes an Ethernet port supporting EtherNet/IP, Modbus TCP/IP, and DNP3 over IP. Serial communication supports DF1, DH-485, Modbus RTU, ASCII, and DNP3.
The supplied unit is identified as Series C with firmware revision 21. Rockwell Automation currently lists catalog number 1766-L32BWA with an Active Mature lifecycle status.
MicroLogix 1400 programmable controller
32 embedded digital I/O points
20 digital 24 VDC inputs
12 relay outputs
12 high-speed DC inputs
Eight standard DC inputs
100 to 240 VAC power supply
Integrated 24 VDC sensor power
20 KB controller memory
Online program editing
Data logging capability
Recipe storage
Embedded real-time clock
Embedded Ethernet communication
RS-232 and RS-485 communication
EtherNet/IP support
Modbus TCP/IP support
Modbus RTU support
DNP3 communication
Supports up to seven 1762 expansion I/O modules
Machine control
Packaging machinery
Material handling systems
Pump and motor control
Small process control systems
Distributed equipment control
Industrial monitoring and data logging
Replacement of installed MicroLogix 1400 controllers
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Catalog Number | 1766-L32BWA |
| Product Family | MicroLogix 1400 |
| Product Type | 32-Point Programmable Controller |
| Series | C |
| Firmware | 21 |
| Total Embedded I/O | 32 |
| Digital Inputs | 20 |
| High-Speed Inputs | 12 |
| Standard Inputs | 8 |
| Outputs | 12 relay outputs |
| Embedded Analog I/O | None |
| Memory | 20 KB |
| Lifecycle Status | Active Mature |
| Country of Origin | Singapore |
| UPC | 612598518104 |
Rockwell currently identifies the 1766-L32BWA as a MicroLogix 1400 32-point controller with 12 fast 24 VDC inputs, eight normal 24 VDC inputs, 12 relay outputs, and 110/240 VAC power.
| Parameter | Specification |
|---|---|
| Power Supply Voltage | 100 to 240 VAC |
| Voltage Tolerance | -15% / +10% |
| Frequency | 47 to 63 Hz |
| Power Consumption | 120 VA |
| 120 VAC Inrush Current | 25 A for 8 ms |
| 240 VAC Inrush Current | 40 A for 4 ms |
| Sensor Power Output | 24 VDC at 250 mA |
| Sensor Power Capacitance | 400 µF maximum |
The MicroLogix 1400 selection guide groups the 1766-L32BWA with the 100...240 VAC supply versions and lists 120 VA power consumption with integrated 24 VDC sensor power.
| Parameter | High-Speed Inputs 0-11 | Standard Inputs 12-19 |
|---|---|---|
| Number of Inputs | 12 | 8 |
| Input Type | 24 VDC | 24 VDC |
| ON-state Voltage | 4.5 to 24 VDC | 10 to 24 VDC |
| ON-state Voltage at 60 degC | Up to 26.4 VDC | Up to 26.4 VDC |
| ON-state Voltage at 30 degC | Up to 30 VDC | Up to 30 VDC |
| OFF-state Voltage | 0 to 1.5 VDC | 0 to 5 VDC |
| Operating Frequency | Up to 100 kHz | Up to 1 kHz |
| Nominal ON Current at 24 VDC | 9.9 mA | 5.3 mA |
The exact input characteristics and high-speed capabilities are specified for the 1766-L32BWA family in the MicroLogix 1400 selection guide.
| Parameter | Specification |
|---|---|
| Number of Outputs | 12 |
| Output Type | Relay |
| Maximum Continuous Current per Channel | 2.5 A |
| Maximum Group Common Current | 8 A for channels 8-11 common |
| Turn ON / OFF Time | 10 ms maximum |
| Minimum Load Current | 10 mA |
| Maximum Controlled Load | 1440 VA |
| Voltage | Make Current | Break Current | Continuous Current |
|---|---|---|---|
| 240 VAC | 7.5 A | 0.75 A | 2.5 A |
| 120 VAC | 15 A | 1.5 A | 2.5 A |
| 250 VDC | 0.11 A | 0.11 A | 1.0 A |
| 125 VDC | 0.22 A | 0.22 A | 1.0 A |
The Rockwell selection guide provides these relay output ratings for the 1766-L32BWA controller group.
| Interface | Supported Functions |
|---|---|
| Channel 0 | Isolated RS-232 / RS-485 |
| Channel 1 | 10/100 Mbps Ethernet |
| Channel 2 | Non-isolated RS-232 |
| EtherNet/IP | Supported |
| Modbus TCP/IP | Supported |
| Modbus RTU | Supported |
| DNP3 | Supported |
| DNP3 over IP | Supported |
| DF1 | Supported |
| DH-485 | Supported |
| ASCII | Supported |
The MicroLogix 1400 includes three communication channels. The embedded Ethernet port supports EtherNet/IP, Modbus TCP/IP, and DNP3 over IP.
| Parameter | Specification |
|---|---|
| User Program Memory | 10 KB |
| User Data Memory | 10 KB |
| Total Memory | 20 KB |
| Data Logging Area | 128 KB |
| Recipe Storage | Up to 64 KB |
| Expansion I/O | Up to 7 x 1762 modules |
| Online Editing | Supported |
| Real-Time Clock | Integrated |
Rockwell specifies 10 KB for the user program and 10 KB for user data. It also provides separate logging and recipe-storage capability.
| Parameter | Specification |
|---|---|
| Width | 180 mm |
| Height | 90 mm |
| Depth | 87 mm |
| Required Ventilation Clearance | 50 mm on all sides |
The official MicroLogix 1400 dimensional drawing gives 180 x 90 x 87 mm for the controller.
Verify the complete catalog number 1766-L32BWA before replacement.
Confirm the installed unit requires the 100 to 240 VAC power configuration.
Record the existing controller program and communication parameters before removal.
Preserve Ethernet, RS-232, and RS-485 network settings.
Confirm input commons and relay output commons before reconnecting field wiring.
Verify high-speed input assignments where counters or pulse-catch functions are used.
Restore the RSLogix 500 project and verify firmware compatibility.
Check all 20 inputs and 12 relay outputs before returning the machine to service.
Match Series C where the installed machine requires the same hardware revision.
Confirm firmware revision 21 against the existing RSLogix project before replacement.
The 1766-L32BWA does not include embedded analog I/O.
Do not confuse it with the 1766-L32BWAA, which includes embedded analog channels.
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Returns & Warranty



The Allen-Bradley 1766-L32BWA is a MicroLogix 1400 32-point programmable controller with integrated digital I/O and Ethernet communication.
This configuration provides 20 digital 24 VDC inputs and 12 relay outputs. The inputs include 12 high-speed channels and eight standard channels.
The controller uses a 100 to 240 VAC power supply and provides an isolated 24 VDC sensor power output. The MicroLogix 1400 platform includes 20 KB of memory, online editing, data logging, recipe storage, and expansion support.
Integrated communication includes an Ethernet port supporting EtherNet/IP, Modbus TCP/IP, and DNP3 over IP. Serial communication supports DF1, DH-485, Modbus RTU, ASCII, and DNP3.
The supplied unit is identified as Series C with firmware revision 21. Rockwell Automation currently lists catalog number 1766-L32BWA with an Active Mature lifecycle status.
MicroLogix 1400 programmable controller
32 embedded digital I/O points
20 digital 24 VDC inputs
12 relay outputs
12 high-speed DC inputs
Eight standard DC inputs
100 to 240 VAC power supply
Integrated 24 VDC sensor power
20 KB controller memory
Online program editing
Data logging capability
Recipe storage
Embedded real-time clock
Embedded Ethernet communication
RS-232 and RS-485 communication
EtherNet/IP support
Modbus TCP/IP support
Modbus RTU support
DNP3 communication
Supports up to seven 1762 expansion I/O modules
Machine control
Packaging machinery
Material handling systems
Pump and motor control
Small process control systems
Distributed equipment control
Industrial monitoring and data logging
Replacement of installed MicroLogix 1400 controllers
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Catalog Number | 1766-L32BWA |
| Product Family | MicroLogix 1400 |
| Product Type | 32-Point Programmable Controller |
| Series | C |
| Firmware | 21 |
| Total Embedded I/O | 32 |
| Digital Inputs | 20 |
| High-Speed Inputs | 12 |
| Standard Inputs | 8 |
| Outputs | 12 relay outputs |
| Embedded Analog I/O | None |
| Memory | 20 KB |
| Lifecycle Status | Active Mature |
| Country of Origin | Singapore |
| UPC | 612598518104 |
Rockwell currently identifies the 1766-L32BWA as a MicroLogix 1400 32-point controller with 12 fast 24 VDC inputs, eight normal 24 VDC inputs, 12 relay outputs, and 110/240 VAC power.
| Parameter | Specification |
|---|---|
| Power Supply Voltage | 100 to 240 VAC |
| Voltage Tolerance | -15% / +10% |
| Frequency | 47 to 63 Hz |
| Power Consumption | 120 VA |
| 120 VAC Inrush Current | 25 A for 8 ms |
| 240 VAC Inrush Current | 40 A for 4 ms |
| Sensor Power Output | 24 VDC at 250 mA |
| Sensor Power Capacitance | 400 µF maximum |
The MicroLogix 1400 selection guide groups the 1766-L32BWA with the 100...240 VAC supply versions and lists 120 VA power consumption with integrated 24 VDC sensor power.
| Parameter | High-Speed Inputs 0-11 | Standard Inputs 12-19 |
|---|---|---|
| Number of Inputs | 12 | 8 |
| Input Type | 24 VDC | 24 VDC |
| ON-state Voltage | 4.5 to 24 VDC | 10 to 24 VDC |
| ON-state Voltage at 60 degC | Up to 26.4 VDC | Up to 26.4 VDC |
| ON-state Voltage at 30 degC | Up to 30 VDC | Up to 30 VDC |
| OFF-state Voltage | 0 to 1.5 VDC | 0 to 5 VDC |
| Operating Frequency | Up to 100 kHz | Up to 1 kHz |
| Nominal ON Current at 24 VDC | 9.9 mA | 5.3 mA |
The exact input characteristics and high-speed capabilities are specified for the 1766-L32BWA family in the MicroLogix 1400 selection guide.
| Parameter | Specification |
|---|---|
| Number of Outputs | 12 |
| Output Type | Relay |
| Maximum Continuous Current per Channel | 2.5 A |
| Maximum Group Common Current | 8 A for channels 8-11 common |
| Turn ON / OFF Time | 10 ms maximum |
| Minimum Load Current | 10 mA |
| Maximum Controlled Load | 1440 VA |
| Voltage | Make Current | Break Current | Continuous Current |
|---|---|---|---|
| 240 VAC | 7.5 A | 0.75 A | 2.5 A |
| 120 VAC | 15 A | 1.5 A | 2.5 A |
| 250 VDC | 0.11 A | 0.11 A | 1.0 A |
| 125 VDC | 0.22 A | 0.22 A | 1.0 A |
The Rockwell selection guide provides these relay output ratings for the 1766-L32BWA controller group.
| Interface | Supported Functions |
|---|---|
| Channel 0 | Isolated RS-232 / RS-485 |
| Channel 1 | 10/100 Mbps Ethernet |
| Channel 2 | Non-isolated RS-232 |
| EtherNet/IP | Supported |
| Modbus TCP/IP | Supported |
| Modbus RTU | Supported |
| DNP3 | Supported |
| DNP3 over IP | Supported |
| DF1 | Supported |
| DH-485 | Supported |
| ASCII | Supported |
The MicroLogix 1400 includes three communication channels. The embedded Ethernet port supports EtherNet/IP, Modbus TCP/IP, and DNP3 over IP.
| Parameter | Specification |
|---|---|
| User Program Memory | 10 KB |
| User Data Memory | 10 KB |
| Total Memory | 20 KB |
| Data Logging Area | 128 KB |
| Recipe Storage | Up to 64 KB |
| Expansion I/O | Up to 7 x 1762 modules |
| Online Editing | Supported |
| Real-Time Clock | Integrated |
Rockwell specifies 10 KB for the user program and 10 KB for user data. It also provides separate logging and recipe-storage capability.
| Parameter | Specification |
|---|---|
| Width | 180 mm |
| Height | 90 mm |
| Depth | 87 mm |
| Required Ventilation Clearance | 50 mm on all sides |
The official MicroLogix 1400 dimensional drawing gives 180 x 90 x 87 mm for the controller.
Verify the complete catalog number 1766-L32BWA before replacement.
Confirm the installed unit requires the 100 to 240 VAC power configuration.
Record the existing controller program and communication parameters before removal.
Preserve Ethernet, RS-232, and RS-485 network settings.
Confirm input commons and relay output commons before reconnecting field wiring.
Verify high-speed input assignments where counters or pulse-catch functions are used.
Restore the RSLogix 500 project and verify firmware compatibility.
Check all 20 inputs and 12 relay outputs before returning the machine to service.
Match Series C where the installed machine requires the same hardware revision.
Confirm firmware revision 21 against the existing RSLogix project before replacement.
The 1766-L32BWA does not include embedded analog I/O.
Do not confuse it with the 1766-L32BWAA, which includes embedded analog channels.
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
Singapore
|