Allen-Bradley MicroLogix 1100 Modules – 1763-L16BBB

Technical Dossier

Product Details And Specifications

Allen-Bradley MicroLogix 1100 Series Technical Notes

The Allen-Bradley MicroLogix 1100 series (catalog prefix: 1763) is a compact, fixed-I/O programmable logic controller platform developed by Rockwell Automation. It is deployed across a broad range of continuous and discrete process industries, including petrochemical refining, water/wastewater treatment, pharmaceutical manufacturing, and power generation auxiliary systems. Its embedded 10/100 Ethernet port (EtherNet/IP), onboard LCD operator interface, and support for up to 144 I/O points via expansion make it one of the most widely installed small PLC platforms in global heavy industry. Installed base estimates place the MicroLogix 1100 in active service at tens of thousands of sites across North America, Europe, and Asia-Pacific, with a significant proportion of units operating beyond their original design lifecycle in legacy control panels.

The Evolution of MicroLogix 1100 Architecture

The MicroLogix 1100 was introduced by Rockwell Automation as a successor to the MicroLogix 1000 (1761 series), addressing the demand for integrated Ethernet connectivity in a sub-compact form factor. The original MicroLogix 1000 lacked native Ethernet and required external communication adapters for network integration. The 1100 resolved this by embedding an EtherNet/IP port directly on the base unit, enabling direct MSG instruction communication with other Logix controllers and SCADA systems without additional hardware.

The architecture is built around a fixed-I/O base unit with an integrated power supply, CPU, and I/O in a single housing. Expansion is achieved via the 1762 MicroLogix Expansion I/O modules, which connect to the right side of the base unit via a proprietary backplane bus. The controller supports up to 7 expansion modules, extending the maximum I/O count to 144 discrete or analog points. Programming is performed exclusively via RSLogix 500 (or Studio 5000 Logix Designer for migration projects), using Ladder Diagram (LD) as the primary language, with limited Function Block Diagram (FBD) support in later firmware revisions.

Rockwell Automation has classified the MicroLogix 1100 as a mature product. While not formally discontinued as of this writing, the recommended migration path for new designs is the Micro820 (2080 series) or Micro850 (2080 series) controllers, which offer expanded memory, IEC 61131-3 multi-language support, and plug-in module architecture. For existing installations, Rockwell continues to provide spare parts and firmware support, but feature development has ceased.

MicroLogix 1100 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified MicroLogix 1100 base unit catalog (1763 series) and directly associated 1762 expansion I/O modules. All models listed are confirmed Rockwell Automation catalog numbers.

Base Controllers (1763 Series)

• 1763-L16AWA: 10 DC In / 6 Relay Out, 120/240VAC power supply, Series A base unit.
• 1763-L16BBB: 10 DC In / 6 DC Out (24VDC source), 24VDC power supply — the most common variant in 24VDC panel architectures.
• 1763-L16BWA: 10 DC In / 6 Relay Out, 120/240VAC power supply, DC input variant.
• 1763-L16DWD: 10 DC In / 6 Relay Out, 12/24VDC power supply, relay output base unit.

1762 Expansion I/O Modules (MicroLogix Expansion)

• 1762-IA8: 8-point 120VAC discrete input expansion module.
• 1762-IQ8: 8-point 24VDC sinking discrete input expansion module.
• 1762-IQ16: 16-point 24VDC sinking discrete input expansion module.
• 1762-IQ8OW8: 8-point DC input / 8-point relay output combination module.
• 1762-OA8: 8-point 120/240VAC discrete output expansion module.
• 1762-OB8: 8-point 24VDC sourcing discrete output expansion module.
• 1762-OB16: 16-point 24VDC sourcing discrete output expansion module.
• 1762-OW8: 8-point relay output expansion module, rated 240VAC/30VDC.
• 1762-OW16: 16-point relay output expansion module for high-density relay applications.
• 1762-IF2OF2: 2-channel analog input (0–10V / 4–20mA) + 2-channel analog output combination module.
• 1762-IF4: 4-channel analog input module, 12-bit resolution, voltage or current configurable.
• 1762-OF4: 4-channel analog output module, 12-bit resolution, voltage or current configurable.
• 1762-IT4: 4-channel thermocouple/mV input module, supports J, K, T, E, R, S, B type thermocouples.
• 1762-IR4: 4-channel RTD/resistance input module, supports Pt100, Pt1000, Ni, and resistance inputs.
• 1762-IQ32T: 32-point 24VDC sinking discrete input module for high-density applications.

Quality Control for the MicroLogix 1100 Range

MicroLogix 1100 base units and 1762 expansion modules are tested against a defined acceptance protocol prior to dispatch. The test procedure addresses the specific failure modes documented in Rockwell Automation field service bulletins for this platform:

• Power supply rail verification: 5VDC logic rail and 24VDC I/O rail measured under load using calibrated bench supply and electronic load.
• Backplane bus integrity: Expansion modules are connected to a reference base unit and polled via RSLogix 500 to confirm error-free I/O tree enumeration. Backplane communication faults (error code 0x0001 or 0x0002) are treated as rejection criteria.
• Discrete I/O functional test: All input channels verified with a 24VDC test signal; all output channels verified under a resistive load. Leakage current on DC output modules measured and compared against datasheet limits.
• Analog module calibration check: For 1762-IF4, 1762-OF4, 1762-IT4, and 1762-IR4 modules, input/output accuracy is verified at 0%, 50%, and 100% of rated range using a calibrated signal source. Modules with offset error exceeding ±0.5% of full scale are rejected.
• Ethernet port test: Base units are assigned a test IP address and pinged at 100Mbps. EtherNet/IP explicit messaging (CIP Read/Write) is verified using a reference Logix controller.
• Firmware version documentation: FRN (Firmware Revision Number) is recorded for each base unit and included in the shipment documentation.