Allen-Bradley 1783-BMS20CA Stratix 5700 Upgrade Solution

Product Overview

Allen-Bradley 1783-BMS20CA Stratix 5700 Upgrade Solution: Seamless Migration from Legacy Industrial Ethernet Infrastructure

The Allen-Bradley 1783-BMS20CA is a 20-port managed industrial Ethernet switch from Rockwell Automation’s Stratix 5700 series, engineered for demanding plant-floor network environments. As industrial facilities transition away from aging unmanaged switches, legacy ring topologies, and end-of-life network hardware, the 1783-BMS20CA serves as a direct replacement and upgrade path that preserves existing wiring infrastructure while delivering modern managed-switch capabilities including IGMP snooping, QoS, VLAN segmentation, and Device Level Ring (DLR) protocol support.

For facilities currently operating older Stratix 5700 variants such as the 1783-BMS10CA (10-port) or the 1783-BMS10CGL (fiber-combo), the 1783-BMS20CA provides a port-count expansion path without requiring changes to the control cabinet backplane or PLC rack layout. The switch mounts on standard DIN rail and accepts 24 VDC input, matching the power supply architecture already present in most Allen-Bradley control panels powered by a 1606-XLP or 1606-XLS series power supply module.

Migration projects involving ControlLogix or CompactLogix controllers — including the 1756-L85E or 5069-L330ERM — benefit directly from the 1783-BMS20CA’s native EtherNet/IP support. The switch integrates transparently into Studio 5000 Logix Designer projects, appearing as a managed device on the EtherNet/IP network tree without requiring additional configuration beyond the initial IP assignment. This eliminates the programming rework that typically accompanies network hardware replacements in legacy systems.

For systems that previously relied on unmanaged switches or older Cisco IE 2000 series hardware, the upgrade to the 1783-BMS20CA introduces VLAN isolation between safety, motion, and standard I/O traffic — a critical requirement for modern functional safety architectures. When combined with a 1783-ETAP EtherNet/IP tap or a 1783-US5T unmanaged switch for edge device connections, the 1783-BMS20CA forms the backbone of a fully segmented plant-floor network.

Wiring compatibility is a primary concern during any network hardware migration. The 1783-BMS20CA uses standard RJ45 copper ports (10/100 Mbps auto-negotiating) and is fully compatible with existing Cat5e and Cat6 structured cabling. No re-termination is required when replacing an older unmanaged switch of equivalent port count. For installations that include fiber uplinks to a supervisory SCADA system or historian server, the switch’s SFP expansion slots accept standard 100BASE-FX or 1000BASE-SX modules, preserving existing fiber runs.

Physical installation space is another key consideration. The 1783-BMS20CA’s compact DIN-rail form factor fits within standard 300mm and 400mm wide control cabinets. When replacing a bulkier rack-mount switch or a panel-mount Ethernet hub, the space savings can be significant — often freeing room for additional 1734-AENT POINT I/O adapter modules or a 2711P-T10C21D8S PanelView Plus 7 HMI terminal within the same enclosure.

Communication protocol compatibility is fully maintained. The 1783-BMS20CA supports EtherNet/IP, Modbus TCP, and standard IEEE 802.3 Ethernet, making it suitable for mixed-vendor environments where third-party drives, sensors, or remote I/O from brands such as Siemens, Schneider Electric, or Beckhoff share the same network segment. This is particularly valuable in brownfield retrofit projects where not all field devices are being replaced simultaneously.

For motion control applications, the switch’s low-latency forwarding and QoS prioritization ensure that time-sensitive EtherNet/IP I/O traffic from Kinetix 5700 servo drives or PowerFlex 755 variable frequency drives is not disrupted by background SCADA polling or HMI refresh traffic. This is a common pain point when migrating from unmanaged switches that treat all traffic with equal priority.

Commissioning the 1783-BMS20CA is straightforward. The switch is configurable via Rockwell’s RSLinx Classic or Studio 5000 network browser, and its web-based management interface is accessible from any engineering workstation on the same subnet. No specialized network engineering tools are required, reducing the skill barrier for plant maintenance teams performing the replacement during a scheduled shutdown window.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete migration to the 1783-BMS20CA typically involves coordinating several interconnected components within the same control system. For I/O expansion, the 1734-AENT POINT I/O EtherNet/IP adapter connects directly to the managed switch, enabling distributed I/O without additional gateways. Where analog signal isolation is required between field instruments and the PLC, a 1492-AIFM analog interface module or a third-party DIN-rail signal isolator can be inserted between the field wiring and the I/O module without affecting the network configuration.

For facilities upgrading their HMI alongside the network infrastructure, the 2711P-T10C21D8S PanelView Plus 7 terminal connects natively over EtherNet/IP to the same network segment managed by the 1783-BMS20CA. Programming cable access during commissioning is handled via a standard USB-to-Ethernet adapter or a 1784-U2DHP USB-to-DH+ interface for legacy DH+ segments that remain in service during a phased migration.

Power distribution within the upgraded control cabinet is typically handled by a 1606-XLP95E or 1606-XLS240E power supply, which provides the 24 VDC rail shared by the switch, I/O modules, and safety relays. For ring topology configurations, the 1783-BMS20CA’s DLR supervisor capability eliminates the need for a separate ring manager module, reducing component count and cabinet complexity compared to older Stratix 5700 deployments that required a dedicated 1783-ETAP2F tap module for ring closure.

In servo and drive applications, the switch’s QoS configuration ensures that Kinetix 5700 drive cyclic data and PowerFlex 755 parameter updates are prioritized correctly, preventing motion faults caused by network congestion during high-load production cycles. This is a documented issue in legacy unmanaged-switch deployments and is fully resolved by the managed QoS capabilities of the 1783-BMS20CA.

Retrofit Guidance FAQ

Q: Can I replace my existing unmanaged switch with the 1783-BMS20CA without changing any wiring?
A: Yes. All RJ45 copper connections are directly compatible. Simply disconnect the existing switch, mount the 1783-BMS20CA on the same DIN rail, reconnect the cables, and assign an IP address via the web interface or Studio 5000. No re-termination is required.

Q: Will my existing Studio 5000 project require modification after the switch replacement?
A: In most cases, no. If the replacement switch is assigned the same IP address as the legacy device, EtherNet/IP I/O connections will re-establish automatically after the controller re-establishes communication. VLAN and QoS configuration is additive and does not affect existing I/O mapping.

Q: Is the 1783-BMS20CA compatible with third-party devices on the same network segment?
A: Yes. The switch supports standard IEEE 802.3 Ethernet and Modbus TCP in addition to EtherNet/IP, making it fully interoperable with Siemens, Schneider Electric, Beckhoff, and other vendor devices on the same subnet.

Q: What is the physical space requirement for installation?
A: The 1783-BMS20CA mounts on standard 35mm DIN rail and requires approximately 45mm of horizontal rail space. It fits within standard 300mm and 400mm wide control cabinets without modification.

Q: How is the switch configured for DLR ring topology?
A: The 1783-BMS20CA can be configured as a DLR ring supervisor or ring node via the Studio 5000 network browser or the switch’s web management interface. No additional hardware is required for ring closure in most standard topologies.

Q: What communication protocols are supported for SCADA integration?
A: EtherNet/IP, Modbus TCP, and standard SNMP for network management. The switch is compatible with Rockwell FactoryTalk, Wonderware, and Ignition SCADA platforms via standard Ethernet connectivity.

Warranty Assurance

Every Allen-Bradley 1783-BMS20CA shipped by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each unit undergoes functional verification including power-on testing, port connectivity checks, and firmware version confirmation. Units are shipped in original or equivalent protective packaging to prevent transit damage.

In the event of a confirmed defect within the warranty period, TOPNLMS provides replacement support with priority processing. Our technical team is available to assist with installation questions, compatibility verification, and commissioning guidance via email and phone. Replacement units are dispatched within 3–5 business days of defect confirmation.

We maintain in-stock inventory of the 1783-BMS20CA and related Stratix 5700 series components to support urgent replacement requirements. Express shipping options are available for critical production downtime situations. All units are sourced through verified supply channels and are accompanied by documentation confirming authenticity and traceability.

For procurement inquiries, bulk pricing, or technical pre-sales support, contact our team directly.

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