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Description
Application Scenarios
Imagine a high-speed packaging line producing consumer goods at 120 units per minute. The system requires precise servo coordination for film feeding, sealing jaws, and product indexing, while also managing dozens of sensors, actuators, and an HMI. Previously, this might have required separate motion controllers and PLCs, increasing complexity and cost. With the 1769-L38ERM, a single controller handles the entire application—managing up to 16 axes of synchronized motion while simultaneously executing logic and communication tasks. The built-in dual Ethernet ports allow the 1769-L38ERM to create a DLR network, eliminating the need for a separate Ethernet switch and simplifying the network topology -1. Plant engineers report that commissioning time is reduced by approximately 30% compared to multi-controller architectures, and the integrated motion reduces wiring and cabinet space.
For OEMs building process skids for the oil and gas industry, the 1769-L38ERM addresses a critical pain point: the need for a scalable, high-performance controller that can handle complex PID loops, analog I/O, and safety integration in a compact footprint. Its rackless design allows flexible mounting on DIN rails or panels, and the ability to support up to 31 local 1769 Compact I/O modules across three expansion banks provides ample capacity for sensor and actuator integration -4. The built-in energy storage eliminates battery maintenance concerns, a significant advantage in remote or hazardous locations where routine battery replacement is impractical -7.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1769-L38ERM |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | Programmable Automation Controller (PAC) |
| User Memory | 5 MB (volatile, maintained by energy storage) |
| Ethernet Ports | 2 x 10/100 Mbps, embedded switch with DLR support |
| EtherNet/IP Nodes | Up to 80 nodes -1-4 |
| CIP Connections | 256 connections -12 |
| Integrated Motion | Up to 16 axes CIP Motion with kinematics support -1-4 |
| Local I/O Capacity | Up to 31 x 1769 Compact I/O modules across 3 banks -4 |
| Max Programs per Task | 1000 programs -12 |
| Serial Port | 1 x RS-232 (DF1, ASCII protocols) |
| USB Port | 1 x USB Client |
| Backplane Current Draw | 850 mA @ 5V DC; 700 mA @ 24V DC -4 |
| SD Card | Included: 1GB (1784-SD1); Supports up to 2GB (1784-SD2) -1-4 |
| Hazardous Location | Class I, Division 2, Groups A, B, C, D |
| Programming Software | RSLogix 5000 / Studio 5000 Logix Designer |
| Dimensions (HxWxD) | 118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in.) |
Technical Principles and Innovative Values
- Innovation Point 1: Embedded Ethernet Switch and DLR Support – The 1769-L38ERM features dual Ethernet ports that function as an integrated switch, allowing the controller to be deployed in ring, star, or linear topologies without requiring external Ethernet switches. Device Level Ring (DLR) capability enables network redundancy: if a single cable break occurs in the ring, communication re-routes in under 3 milliseconds. This is critical for applications where network downtime directly impacts production throughput -1-7.
- Innovation Point 2: Integrated CIP Motion with Kinematics – The “M” designation in 1769-L38ERM signifies integrated motion capability. The controller can manage up to 16 axes of synchronized motion directly over EtherNet/IP using the CIP Motion protocol. This eliminates the need for dedicated motion controllers and proprietary motion networks, reducing system cost and complexity. Kinematics support enables coordinated multi-axis movements such as delta robots, gantry systems, and articulated arm control—directly from the Logix programming environment -1-7.
- Innovation Point 3: Rackless Design and Flexible Expansion – Unlike traditional PLCs that require a backplane chassis, the 1769-L38ERM features a rackless design that mounts directly to DIN rail or a mounting plate. Expansion is achieved by snapping 1769 Compact I/O modules directly onto the controller or through remote I/O banks, with support for up to 31 local modules across three banks. This modular architecture reduces cabinet space requirements and allows system expansion without replacing the entire controller -4.
- Innovation Point 4: Battery-Free Energy Storage – The 1769-L38ERM uses built-in energy storage circuitry to maintain user memory and the real-time clock during power loss, eliminating the need for a replaceable battery. This reduces maintenance costs, eliminates the risk of data loss due to battery depletion, and simplifies compliance with environmental regulations. For systems with frequent power cycles or extended outages, the controller also includes an SD card slot for program storage and automatic program loading on power-up -4-7.
- Innovation Point 5: Unified Logix Control Engine – The 1769-L38ERM runs the same Logix control engine as larger ControlLogix controllers, providing a consistent programming environment across the entire Rockwell Automation portfolio. This means programs written for a 1769-L38ERM can be easily migrated to a ControlLogix platform for larger applications, preserving engineering investment. The controller supports 32 tasks with up to 1000 programs per task, enabling complex, multi-process applications to be structured logically and efficiently -12.
