Allen-Bradley 1783-BMS20CGP Replacement for Stratix 5700

Product Overview

Allen-Bradley 1783-BMS20CGP Replacement for Stratix 5700: Seamless Transition to Modern Industrial Networking

Upgrading or replacing the Allen-Bradley 1783-BMS20CGP Stratix 5700 20-Port Managed Industrial Ethernet Switch is one of the most common network modernization tasks in Rockwell Automation-based control systems. Whether your existing 1783-BMS20CGP has reached end-of-life, suffered hardware failure, or your plant is migrating from an older flat network architecture to a structured, ring-topology EtherNet/IP backbone, this replacement unit delivers a smooth, low-risk transition with minimal engineering rework.

The 1783-BMS20CGP is a 20-port managed switch from the Stratix 5700 family, designed specifically for industrial environments running ControlLogix, CompactLogix, or GuardLogix controllers over EtherNet/IP. It supports Device Level Ring (DLR) topology, IGMP snooping, QoS prioritization, and VLAN segmentation — all critical features for deterministic communication between PLCs, I/O modules, HMIs, and drives in a production environment. This replacement unit preserves full compatibility with those network features, allowing your existing configuration templates and Logix Designer project files to be reused without structural changes.

In a typical migration scenario, the 1783-BMS20CGP sits at the core of a machine-level or cell-level EtherNet/IP ring, interconnecting devices such as the 1756-EN2TR EtherNet/IP communication module in a ControlLogix rack, distributed 1734 POINT I/O adapter modules, PowerFlex 525 or PowerFlex 755 drives, and PanelView Plus HMI terminals. Because the replacement unit maintains the same port count, SFP uplink slots, DIN-rail mounting footprint, and 24 VDC power input specification as the original, physical installation into an existing control cabinet requires no panel modification. Existing cable runs — whether Cat5e, Cat6, or fiber via SFP — connect directly without re-termination.

From a software perspective, the switch configuration can be restored from a previously exported Stratix Device Manager or Studio 5000 Logix Designer network configuration backup. Port assignments, VLAN IDs, QoS DSCP markings, and IGMP querier settings transfer cleanly. If the original configuration file is unavailable, the replacement unit ships with factory defaults and can be reconfigured using the embedded web interface or via the Logix Designer Add-On Profile (AOP) for Stratix switches, which is available through Rockwell Automation’s FactoryTalk software ecosystem.

For plants running a broader Stratix network infrastructure, this replacement integrates seamlessly alongside other Stratix family members. A common architecture pairs the 1783-BMS20CGP with a Stratix 5400 (1783-HMS series) as the supervisory distribution switch, while Stratix 2000 unmanaged switches (1783-US series) serve simple device-level drops. The 1783-BMS20CGP replacement fits into this hierarchy without requiring firmware or topology changes at adjacent nodes.

During the physical swap, the recommended procedure is to document all port-to-device mappings before powering down, replace the unit, restore the configuration, and verify ring health via the DLR supervisor status in Logix Designer before resuming production. The entire hot-swap process — including configuration restore and ring verification — typically completes within 30 to 60 minutes for a prepared maintenance team, significantly reducing unplanned downtime compared to sourcing a new unit through standard distribution channels with extended lead times.

Beyond the switch itself, a complete network modernization project may also involve replacing aging 1783-ETAP EtherNet/IP tap modules used for DLR ring connections, upgrading 1756-EN2T single-port EtherNet/IP bridge modules to dual-port 1756-EN2TR variants to support ring redundancy, and refreshing 1734-AENT or 1734-AENTR POINT I/O EtherNet/IP adapter modules to current firmware-compatible versions. These companion components are available from our inventory and can be sourced alongside the 1783-BMS20CGP replacement to complete a single-purchase, single-shipment modernization kit.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete Stratix 5700 network replacement or upgrade project rarely involves a single component. In practice, the 1783-BMS20CGP is the central node in a broader EtherNet/IP architecture. During the same maintenance window, engineers frequently address adjacent components: the 1756-EN2TR dual-port EtherNet/IP module in the ControlLogix chassis provides the ring-capable controller connection; 1734-AENTR POINT I/O EtherNet/IP adapters serve as the distributed I/O endpoints on the ring; PowerFlex 525 drives connect as EtherNet/IP nodes for coordinated motion and process control; and PanelView Plus 7 HMI terminals provide the operator interface layer. For fiber uplink segments, LC-type SFP transceivers compatible with the 1783-BMS20CGP SFP slots are required. Where signal isolation between legacy 4–20 mA analog field instruments and the new EtherNet/IP I/O layer is needed, signal isolators or 1492 terminal block wiring systems bridge the gap cleanly. All of these components can be sourced together to minimize procurement cycles and consolidate shipping into a single delivery.

Retrofit Guidance FAQ

Q: Can I reuse my existing Ethernet cabling?
Yes. The 1783-BMS20CGP replacement uses standard RJ45 copper ports (10/100 Mbps auto-negotiating) and SFP combo ports. Existing Cat5e or Cat6 runs and fiber SFP modules are fully reusable.

Q: Will my Logix Designer program require changes?
No. The switch appears as a standard EtherNet/IP device. If you use the Logix Designer AOP for Stratix switches, simply re-import the AOP and restore the configuration. Controller I/O tags and ladder logic are unaffected.

Q: Does the replacement support the same DLR ring topology?
Yes. The replacement unit supports DLR in both Supervisor and Ring Node modes, identical to the original 1783-BMS20CGP. Ring health status is visible in Logix Designer without additional configuration.

Q: What is the physical installation space requirement?
The unit mounts on standard 35 mm DIN rail. The footprint and depth are equivalent to the original, so no panel modification is required in an existing control cabinet.

Q: How do I handle the communication protocol transition if upgrading from an older flat network?
The 1783-BMS20CGP replacement supports VLAN segmentation to isolate legacy device traffic from the EtherNet/IP control plane. IGMP snooping limits multicast I/O traffic to relevant ports only, preventing bandwidth saturation during the transition period.

Warranty Assurance

Every 1783-BMS20CGP replacement unit shipped from TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to shipment, each unit undergoes functional verification including power-on self-test, port link verification, and DLR ring participation testing. In the event of a confirmed hardware defect within the warranty period, we provide a replacement unit or full refund — your choice — with priority processing to minimize your production impact. Our technical support team is available to assist with configuration questions, compatibility verification, and post-installation commissioning guidance. Orders are processed and dispatched within 1–3 business days, with express shipping options available for urgent breakdown situations. All units are securely packaged for international freight and include full documentation.