Allen-Bradley 1769-L36ERM: The Top-Tier 1769 Controller for Mid-Size Multi-Axis Machines

Application Scenarios

A regional OEM building continuous-motion carton erectors was hitting a wall with the 1769-L33ER​ on their previous-generation machine: 2 MB memory filled up fast once they added 8 Kinetix 5500 axes, a PanelView Plus 7, three banks of 1769 I/O, and a handful of PowerFlex 755 VFDs on the same EtherNet/IP network. They’d maxed out at 8 axes (the L33ER ceiling) but the new customer spec called for 12 servo axes plus two more VFD positioning loops, and the logic was growing beyond 1.6 MB with AOI-heavy code for tool-change sequencing. The swap to 1769-L36ERM/A​ solved three things at once: memory jumped to 3 MB (letting them keep all AOIs and add data-logging), axis count unlocked to 16 (CIP Motion over the same dual EtherNet/IP ports, no extra motion card), and EtherNet/IP node capacity went from 32 to 48—enough to hang three remote POINT I/O arms and a second HMI without network reshuffling. The machine shipped with firmware v32, Studio 5000 v32, and a 1784-SD2 2 GB card for non-volatile backup. The integrator’s commissioning lead noted the biggest win wasn’t just the headroom—it was that the 1769-L36ERM/A​ let them keep the exact same 1769 rack layout (30 modules across 3 banks) and the same 1769-PA4 power supply, so the panel drawings barely changed.

Parameter

Technical Principles and Innovative Values

• Innovation Point 1: CIP Motion Without a Dedicated Motion Card.​ The 1769-L36ERM/A​ handles servo axis profiling, position/velocity/torque loops, and even kinematic transformations entirely over standard EtherNet/IP via the dual embedded ports. No SERCOS, no 1756-M08SE, no external motion PCI—just a CAT6 run from the controller port to a Kinetix 5500/5700 drive. CIP Sync (IEEE 1588) gives sub-microsecond clock alignment across axes, so a 12-axis registration section on a flow wrapper stays phase-locked even at 300 packs/min.
• Innovation Point 2: 3-Bank 1769 Expansion in a 55 mm Footprint.​ Most compact PLCs cap out at one local bank (~8 modules). The 1769-L36ERM/A​ drives up to 30 1769 I/O modules across three banks using 1769-CRR3 / 1769-CRL3 ribbon expansion cables, each bank needing its own 1769-PA4 or -PB4 power supply (the 425 mA @ 5 V backplane limit still applies per-bank). This lets a single controller host high-density DI/DO/AI/AO/HSC/ASCII on one rack instead of forcing distributed POINT I/O for everything—cheaper per-point and simpler panel layout for OEMs.
• Innovation Point 3: Battery-Less + SD Architecture.​ The 1769-L36ERM/A​ ditches the traditional 1756-series lithium battery. Retentive data survives via supercap (≥8-day RTC hold) plus a 1784-SD1 (1 GB, ships standard) or 1784-SD2 (2 GB, upgrade). Firmware, program, and tag data can all persist on the SD—swap a dead controller, pop the SD into the new one, power up, and the machine is back. For food/bev or pharma lines where battery disposal is a compliance headache, this alone justifies the 5370 generation over the older L3x (L35E/L32E) it replaced.

Application Cases and Industry Value

Case 1 – Continuous-Motion Flow Wrapper (Snack Food).​ A contract packer running 12 lanes of pillow-pack cookies used the 1769-L36ERM/A​ to coordinate a 14-axis servo train: 4 × Kinetix 5700 on the former/chain, 6 × Kinetix 5500 on the cross-seal rotary knives, 2 × Kinetix 5500 on the discharge turner, plus 2 × PowerFlex 755 for the film unwind/rewind. CIP Motion over a DLR ring meant that when a forklift crushed the “B-side” Ethernet cable during a pallet move, the ring healed in <300 ms and the knives never lost phase—zero scrap on that run. The 3 MB memory held the OEM’s library of 48 AOIs (lane-tracking, mark-registration, auto-splice) plus 6 weeks of OEE datalogging to the SD card. The plant engineer’s feedback: “We tried fitting this on an L33ER first. It ran, but firmware upload took 45 seconds and we were at 88% memory. The 1769-L36ERM/A​ gave us the breathing room and the second Ethernet port for the DLR.”Case 2 – Automotive Sub-Assembly Dial Indexer (OEM Skid).​ An integrator built a 6-station dial with 10 servo axes (pick, place, press, vision-registration, torque-monitor) and ~180 1769 I/O points spread across 22 modules in 2 banks. The 1769-L36ERM/A​ hosted the logic, talked CIP Motion to Kinetix 5700, and served as an EtherNet/IP bridge to a remote 1734 POINT I/O rack on the dial rotor (via a managed switch on port 2). The DLR topology on port 1 tied the HMI, the dial’s local 1769 rack, and a barcode scanner into a single resilient loop. Commissioning time dropped ~18% versus the previous L35E-based design because the USB port let the programmer tether a laptop without hunting for a 1784-CP10 serial cable, and Studio 5000 v32’s motion profile preview meant they dialed in the cam curves at the desk instead of on the floor.

Related Product Combination Solutions

• 1769-L33ER​ – The middle sibling: 2 MB, 8 axes, 16 modules/2 banks, 32 EtherNet/IP nodes. Often paired alongside 1769-L36ERM/A​ on OEM lines where a “master + slave” 1769 rack split makes sense.
• 1769-PA4 / 1769-PB4​ – 120 VAC / 24 VDC system power for 1769 racks; each I/O bank under a 1769-L36ERM/A​ needs its own supply, and the controller itself draws from the first-bank PS via backplane.
• 1769-CRR3 / 1769-CRL3​ – Ribbon expansion cables linking bank 1→2→3; mandatory once you go beyond 8 modules on a 1769-L36ERM/A​ build.
• 1784-SD2​ – 2 GB Secure Digital card; the 1769-L36ERM/A​ ships with SD1 (1 GB), but SD2 is the recommended field-upgrade for large AOI libraries and datalogging.
• Kinetix 5700 (2198-Dxxx)​ – The natural servo drive pairing for 1769-L36ERM/A​ CIP Motion; dual-axis modules save cabinet space, and Safe Torque Off is native.
• PanelView Plus 7 (2711P-Txxx)​ – Standard HMI companion; the 1769-L36ERM/A​ DLR port daisy-chains straight to the PVP7’s second Ethernet port with zero extra switch hardware.
• 5069-L310ER​ – The CompactLogix 5380 migration target if you’re planning ahead; 5 MB memory, 1769-I/O compatibility via 5069-IFB/OFB interface modules, but note: different rack, different PSU, not a drop-in for 1769-L36ERM/A.