The Allen‑Bradley 1769-L27ERM-QBFC1B belongs to the CompactLogix 5370 L2 PAC controller family.
This controller delivers scalable performance in a compact form for small to mid‑range automation systems.
It includes a built‑in 24V DC power supply and eliminates the need for external lithium batteries.
A removable 1GB industrial SD card provides reliable non‑volatile memory storage for user programs.
The 1769-L27ERM-QBFC1B supports up to 32 tasks and 100 programs per task for flexible application design.
It offers integrated motion control over EtherNet/IP with support for up to 16 motion axes.
Dual Ethernet ports support linear, star, and Device Level Ring (DLR) network topologies.
This controller reduces panel space requirements by up to 40% while maintaining high functionality.
It connects to HMIs, SCADA, OPC servers, and third‑party tools for complete system integration.
The 1769-L27ERM-QBFC1B supports up to four 1769 Compact I/O modules and one expansion bank.
The 1769-L27ERM-QBFC1B features 1MB of embedded user memory for program execution.
It includes a 1GB industrial SD card for non‑volatile data and program storage.
The controller supports up to 32 individual tasks to manage multiple processes simultaneously.
Each task can hold up to 100 separate programs for structured application development.
High‑performance processing ensures fast scan times and reliable real‑time control.
Sigma‑Delta analog conversion provides high‑resolution measurement with flexible update times.
This controller provides 16 embedded 24V DC sinking/sourcing digital input channels.
It also includes 16 embedded 24V DC sourcing digital output channels for direct field control.
Four high‑speed counter (HSC) inputs support fast pulse and position monitoring applications.
Four universal analog input channels accept voltage, current, resistance, RTD, and thermocouple signals.
Two single‑ended analog output channels supply configurable voltage and current signals.
Analog inputs offer 16‑bit unipolar and 15‑bit plus sign bipolar measurement resolution.
The 1769-L27ERM-QBFC1B supports update times from 11 ms up to 5000 ms for analog loops.
Analog input ranges include ±50 mV, ±100 mV, 0–5V, 1–5V, 0–10V, and ±10V.
Current inputs support 0–20 mA and 4–20 mA for standard industrial transmitters.
Resistance measurement covers 0–150, 0–500, 0–1000, and 0–3000 ohm ranges.
Supported RTD types include Pt385, Pt3916, Cu426, Ni618, Ni672, and Ni‑Fe 518.
Thermocouple support includes J, K, T, E, R, S, B, N, and C types across full temperature ranges.
Analog outputs provide 0–5V, 1–5V, 0–10V, ±10V, 0–20 mA, and 4–20 mA ranges.
The 1769-L27ERM-QBFC1B has two EtherNet/IP ports and one USB programming port.
Ethernet supports DLR, linear, and star topologies for robust network architecture.
It allows up to 120 TCP connections and 256 CIP connected messaging sessions.
The controller handles 32 multicast and 128 unicast produced tags for efficient data sharing.
Communication extends to HMIs, SCADA, DCS, OPC servers, gateways, and databases.
It connects to distributed Flex I/O and POINT I/O modules over the Ethernet network.
Optional DeviceNet communication is available using the 1769‑SDN module.
The 1769-L27ERM-QBFC1B mounts securely on standard DIN rails in control panels.
Shipping dimensions measure 11 x 8 x 6 inches with a total weight of 3 pounds.
Recommended wiring uses copper conductors rated for 90°C operating temperature.
Solid wire sizes range from 22 AWG to 14 AWG for secure terminal connections.
Stranded wire sizes range from 22 AWG to 16 AWG for flexible cabling scenarios.
The replacement terminal block part number is 1769‑RTBN18 for field maintenance.
This controller is available in Series A and Series B revisions for broad compatibility.
Begin installation by selecting a suitable location on a standard industrial DIN rail.
Ensure the mounting area provides adequate clearance and ventilation for the controller.
Align the 1769-L27ERM-QBFC1B with the DIN rail and snap it firmly into position.
Connect the 24V DC power supply to the dedicated power terminals on the controller.
Use copper wire within the recommended AWG range for all power and I/O connections.
Attach digital input and output devices according to sinking or sourcing configuration needs.
Wire analog sensors, transmitters, RTDs, or thermocouples to the universal analog input terminals.
Connect analog output devices to the dedicated single‑ended output channels.
Attach Ethernet cables to both ports for network communication and device integration.
Insert the 1GB industrial SD card to store non‑volatile user programs and data.
Apply power and verify LED indicators to confirm proper startup and operation.
Use the USB port with programming software for initial configuration and project download.
| Brand Name | Allen‑Bradley |
| Model No. | 1769-L27ERM-QBFC1B |
| Product Type | CompactLogix PAC Controller |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
