Stratix 5700 1783-BMS20CL Replacement Guide

Overview

The Allen-Bradley Stratix 5700 series has been a foundational standard for industrial Ethernet deployments, bridging the gap between Operational Technology (OT) and Information Technology (IT). Developed by Rockwell Automation in collaboration with Cisco, these managed switches utilize Cisco IOS (Internetwork Operating System) technology to provide robust network management, advanced security, and seamless integration into Rockwell's Logix control environment.

Among the various models in this family, the 1783-BMS20CL has been a workhorse for medium-to-large control panels. Configured as a 20-port Layer 2 Lite switch, it provides a balance of high port-density and streamlined software features suited for basic managed network topologies.

However, because the Stratix 5700 platform is now transitioning deeper into its lifecycle end-of-use and discontinuation phases, automation engineers must strategize their replacement paths. Whether you need an identical, direct replacement to minimize immediate engineering downtime, or a modern migration path to active hardware families like the Stratix 5200 or Stratix 5800, this technical guide outlines the critical parameters, compatibility considerations, and physical step-by-step procedures to execute a successful swap.

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Legacy Product Information

The 1783-BMS20CL is a 20-port Managed Ethernet Switch featuring "Layer 2 Lite" firmware. This firmware profile is optimized for standard industrial applications that require diagnostic visibility, VLANs, and basic loop-prevention protocols (such as Spanning Tree Protocol), without the added complexity or cost of Full Layer 2 routing profiles or Network Address Translation (NAT).

Technical Specifications

• Catalog Number: 1783-BMS20CL
• Total Ports: 20 Ports
  • 16 Fast Ethernet Ports: 10/100 Base-T (RJ45 copper)
  • 2 Gigabit Ethernet Ports: 10/100/1000 Base-T (RJ45 copper)
  • 2 Combo Gigabit Ports: Dual-purpose slots that can function either as 10/100/1000 RJ45 copper ports or accommodate Small Form-Factor Pluggable (SFP) fiber-optic transceivers.
• Firmware Profile: Layer 2 Lite
• Power Supply: Dual redundant 12V/24V/48V DC power inputs (Operating range: 9.6–60V DC)
• Enclosure Rating: IP30, DIN-rail mount
• Operating Temperature: -40 °C to 60 °C (-40 °F to 140 °F)
• Configuration Tools: Studio 5000 Logix Designer Add-On Profile (AOP), Device Manager (HTML/Java Web Interface), Command Line Interface (CLI) via Console RJ45 Port.
• Lifecycle Status: Discontinued / Legacy. Rockwell Automation has phased out active production of this catalog number, making direct replacements from OEM channels difficult to source new.

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Recommended Replacements

When replacing the 1783-BMS20CL, industrial facilities have three primary options depending on their engineering budget, timeline resilience, and desire to modernize their network physical layer.

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Compatibility Considerations

When migrating from a legacy 1783-BMS20CL to a newer switch architecture, you must examine several technical parameters to avoid commissioning delays.

Firmware & Configuration Translation

The Stratix 5700 runs classic Cisco IOS. The newer Stratix 5200 and 5800 families operate on Cisco’s modernized IOS-XE operating system. If you attempt to copy the raw command-line configuration (config.text or running-config) directly from a 1783-BMS20CL SD card to a Stratix 5200, the parser will fail on several parameters. Specifically, Smartports configuration commands, port mirroring definitions, and VLAN access map configurations have evolved and require syntax adjustments.

Rockwell Studio 5000 Integration (CIP / AOP)

One of the key selling points of the 1783-BMS20CL is its native integration with Logix-based PLCs via Common Industrial Protocol (CIP).

• Add-On Profiles (AOP): The Stratix 5700 AOP is built directly into legacy Studio 5000 routines. If you replace the 1783-BMS20CL with a Stratix 5200 (1783-CMS20CR), you must install the updated Logix Designer Add-On Profile corresponding to the Stratix 5200.
• Controller Keying: Upgrading the hardware requires taking the Logix controller briefly out of Run mode to modify the I/O Configuration Tree unless Electronic Keying is set to "Disable Keying" on the switch diagnostic module.

SD Card Portability

The 1783-BMS20CL reads configurations from a custom industrial SD card (such as catalog 1783-MCG). This SD card cannot be placed directly into a Stratix 5200 or 5800 to restore system operations. This method is only supported when replacing a 1783-BMS20CL with an identical refurbished or surplus 1783-BMS20CL unit.

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Upgrade Benefits

Upgrading from the legacy Stratix 5700 to the modern Stratix 5200 or modular 5800 platform unlocks several key technological advantages:

1. Enhanced Edge Cybersecurity: Modern switches feature updated security mechanisms, including advanced IEEE 802.1x authentication, TACACS+ and RADIUS enhancements, port-level access control lists (ACLs), and more robust defense against Man-in-the-Middle (MitM) physical tampering.
2. Elimination of Adobe Flash/Java Tech Debt: Legacy Stratix 5700 firmware relied on Java or Flash dependencies for its Device Manager web interface. Upgraded platforms use modern, fast, responsive HTML5 administrative web GUIs accessible from any modern web browser.
3. True Gigabit Performance: While the 1783-BMS20CL limits you to 10/100 Mbps on 16 of its 20 ports, standard upgraded variants offer all-Gigabit wire speeds. This bandwidth is crucial for integrating high-resolution industrial IP cameras, overhead vision systems, and high-frequency remote telemetry units.
4. Resilience and Product Lifecycle Support: Moving away from a discontinued platform ensures your facility complies with insurance, cybersecurity compliance standards, and corporate lifecycle support policies.

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Common Migration Challenges

Transitioning your plant infrastructure presents potential roadblocks:

• Physical Depth and Cabinet Clearance: Modern industrial switches can differ in depth and physical volume compared to the original Stratix 5700 block design. Confirm that your enclosure has enough clearance space for fiber bend radiuses.
• Fiber SFP Compatibility: Traditional 100FX (Fast Ethernet) fiber optic SFP transceivers (e.g., 1783-SFP100FX) installed in your legacy 1783-BMS20CL combo ports may not be supported on standard SFP interfaces of modern Gigabit-only switches. Verify if you need to upgrade optical transceivers to Gigabit models (such as 1783-SFP1GSX or 1783-SFP1GLX).
• Console Cable Standards: The 1783-BMS20CL features an RJ45 console port. Upgraded variants typically transition to USB Type B or Micro-USB console ports, demanding a change in field service programmers' laptop accessories.

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Step-by-Step Replacement Procedure

Follow these detailed steps depending on whether you are executing a direct hardware swap or migrating to a modern ecosystem.

Option A: Direct Swap with a Surplus/Refurbished 1783-BMS20CL (Fastest Recovery)

1. Power Isolation: Locate the circuit breakers powering the redundant DC terminals on the target 1783-BMS20CL. Switch off both DC sources. Verify that the system LED diagnostics are blank.
2. Cable Tagging: Label every single Ethernet connector with its designated physical port number (Port 1 through Port 20) to preserve network segment allocations and VLAN assignments. Unplug all RJ45 cables and remove fiber SFP modules by pulling down their extraction bails.
3. Card Extraction: Locate the SD card slot on the front/top face of the failing switch. Press the card inward to release, then slide it out.
4. Physical Demounting: Insert a flat-head screwdriver under the DIN-rail tension latch of the failed unit. Pull down to release and pivot the switch up and off the DIN rail.
5. Physical Installation: Hook the top flange of the replacement 1783-BMS20CL onto the DIN rail, then apply downward and inward pressure until the bottom latch clicks securely.
6. Card Insertion: Slide the saved SD card into the slot of the replacement switch until it clicks home.
7. Re-cabling: Re-insert all Ethernet RJ45 cables and SFP modules into their corresponding ports. Ensure SFP bays snap cleanly into place.
8. Power Execution: Re-apply the DC power supply feeds. The switch will automatically pull the boot configuration directly from the SD card. Observe the LEDs: wait for the system (SYS) LED to turn solid green.

Option B: Migrating to a Newer Stratix 5200 (1783-CMS20CR)

1. Information Harvesting: Connect a console cable to the active 1783-BMS20CL. Launch a terminal emulator (e.g., PuTTY) set to 9600 baud, 8 data bits, no parity, 1 stop bit, no flow control. Run commands:
   • show running-config (Save copy to text file)
   • show vlan brief
   • Record IP configurations, subnet masks, default gateways, and custom Smartports macro applications.
2. Logix Configuration Prep: Open the Studio 5000 Logix Designer project. Download the Stratix 5200 Add-On Profile. Add the new switch type to the I/O configuration network tree, matching the IP configuration of the old unit. Match any CIP-enabled tag linkages to preserve HMI diagnostic readouts.
3. Physical Replacement: Power down the old 1783-BMS20CL. Unmount it from the DIN rail and mount the new Stratix 5200.
4. Rewiring & Port Matching: Reconnect all Ethernet cables. Ensure any Fast Ethernet fiber circuits are configured through compatible Gigabit transceivers if required by the new switch architecture.
5. Initial Commissioning: Connect your technician's PC directly to the dynamic DHCP port or base default port of the new Stratix 5200. Access the HTML5 express setup utility via your browser. Assign its static management IP, subnet mask, and login credentials.
6. Manual Configuration Implementation: Utilizing the text-based backup configuration harvested in Step 1, apply matching VLAN tables, assigned trunk lines, and customized port characteristics using the new switch's system terminal or HTML5 user interface dashboard.
7. Verify Network Concurrency: Re-establish link connectivity with adjacent switches. Confirm communication flow to PLCs, remote IO racks, and supervisory control computers.

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Frequently Asked Questions

Q: Can I run my new active-migration switch without changing the Logix Designer AOP?

A: If you only use the Stratix 5700 as an unmanaged block or a vanilla L2 device without checking diagnostic tags, yes. However, if the PLC’s I/O tree expects a 1783-BMS20CL diagnostic profile via CIP connections, it will error out with a connection mismatch. You must update the Logix project to reflect the proper replacement model catalog number.

Q: Does the legacy SD card work if formatting differences exist?

A: No. The database schema and command structure between IOS and IOS-XE are fundamentally incompatible. Inserting an old SD card into standard modern switches may lead to startup errors or physical driver initialization faults.

Q: What is the exact difference between the "Lite" (CL) and "Full" (CG) software levels on the 20-port variants?

A: Layer 2 Lite (CL) provides basic layer 2 switching functions, web GUI setup, Express Setup, security policies, and VLAN support. Layer 2 Full (CG) adds physical routing protocols, dynamic routing capabilities, 1:1 NAT (Network Address Translation) functions, and expanded advanced security protocols.

Q: Can I use 10/100Mbps SFPs on the newer Stratix replacement switches?

A: Most premium multi-gig platforms do not backward negotiate down to 100FX SFP transceivers on SFP/SFP+ combo ports. Check your replacement manual; you may need to source upgraded 1000Base-X (Gigabit) SFPs to establish link continuity with old fiber runs.

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Related Products & Families

• Stratix 5700 Base Series: 1783-BMS10CL, 1783-BMS20CG, 1783-BMS12T4D2W
• Stratix 5200 Modern Series: 1783-CMS20CR, 1783-CMS10BL, 1783-CMS20CG
• Stratix 5800 Advanced Series: 1783-BMS10A, 1783-BMS10CGN, 1783-XMS14T
• Stratix SFP Accessories: 1783-SFP100FX, 1783-SFP1GSX, 1783-SFP1GLX, 1783-SFP100LX
• Sperry/Allen-Bradley Power Supplies: 1606-XLE120E, 1606-XLP72E (Recommended DC power feed hardware)

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Need Help?

Finding optimal replacements for discontinued automation equipment can be a challenge. At Palm Parts Solution, we specialize in high-quality, comprehensively tested new, refurbished, and surplus industrial automation hardware.

If you need a direct drop-in replacement 1783-BMS20CL to avoid immediate engineering hours, configuration updates, or program changes, Palm Parts Solution can supply certified legacy parts with complete, peace-of-mind warranties. Contact our industrial automation specialists today to secure your critical machinery and minimize downtime.