Allen-Bradley 193-EC2DD Replacement for E3 Plus DeviceNet

Product Overview

Allen-Bradley 193-EC2DD Replacement for E3 Plus DeviceNet: Seamless Transition & Legacy System Upgrade

The Allen-Bradley 193-EC2DD is a DeviceNet-enabled electronic overload relay from Rockwell Automation’s E3 Plus series, designed for motor protection in demanding industrial environments. As legacy motor control centers (MCCs) and DeviceNet-based control architectures age, many facilities face the challenge of sourcing direct replacements or executing a controlled upgrade path without disrupting production. TOPNLMS maintains verified stock of the 193-EC2DD to support both drop-in replacement and phased migration strategies.

The 193-EC2DD integrates directly into Allen-Bradley 193-series mounting bases and is fully compatible with existing DeviceNet network segments managed by a ControlLogix or CompactLogix PLC. Engineers migrating from earlier E1 Plus or E3 overload relays will find that the 193-EC2DD retains the same DIN-rail footprint and terminal block layout, eliminating the need for panel re-drilling or wiring harness redesign. The DeviceNet node address and baud rate are configured via front-panel rotary switches, preserving compatibility with existing RSNetWorx for DeviceNet configuration files and EDS device profiles.

For facilities running a 1756 ControlLogix chassis with a 1756-DNB DeviceNet scanner, the 193-EC2DD appears as a standard Group 2 Only slave device. No changes to the scanner’s scanlist are required when performing a like-for-like swap, provided the node address is matched to the outgoing unit. Where the existing overload relay is wired to a 1794 FLEX I/O adapter or a 1734 POINT I/O DeviceNet coupler, the same node-level replacement procedure applies — the host controller’s I/O tree requires only a re-download of the existing configuration, not a full program revision.

Wiring compatibility is a primary concern during any overload relay replacement. The 193-EC2DD uses the same A1/A2 control circuit terminals and T1/T2/T3 load-side terminals as its predecessors in the 193 series. Control voltage options (100–240 V AC or 24 V DC) must be confirmed against the existing control transformer or 1606 power supply output before installation. For applications where the overload relay is mounted directly to a 100-C or 104-C series contactor, the 193-EC2DD’s integral bypass plug ensures mechanical and electrical continuity without additional wiring adapters.

In DeviceNet architectures, the 193-EC2DD transmits real-time motor diagnostics — including current, thermal capacity used, and fault codes — over the network to the host PLC. This data is mapped into the controller’s input image table and can be consumed by existing ladder logic or function block routines without modification, provided the I/O mapping was originally configured for an E3 Plus device. Facilities upgrading from a non-networked overload relay to the 193-EC2DD will need to add a DeviceNet drop cable and configure the device in RSNetWorx, then update the PLC program to consume the new I/O data.

Physical installation space is rarely a constraint when replacing within the E3 Plus family. The 193-EC2DD occupies the same 45 mm width profile as other 193-series devices and mounts to the same 193-DNDL or 193-DNDN mounting base. Control cabinet layouts designed around the original device require no modification. For retrofit projects where the original mounting base is worn or damaged, a replacement 193-DNDL base can be sourced alongside the relay to complete the assembly.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete 193-EC2DD retrofit typically involves more than the overload relay itself. For facilities upgrading a full motor starter assembly, the 100-C09 or 100-C16 IEC contactor is commonly paired with the 193-EC2DD via the integral bypass plug, eliminating the need for separate auxiliary contact wiring. Where the DeviceNet trunk cable requires extension or a new drop, a standard DeviceNet thin cable with micro-style connectors and a 1485P-P1A5-M5 tap provides a clean, standards-compliant connection point.

In ControlLogix-based systems, the 1756-DNB DeviceNet scanner module manages all 193-EC2DD nodes on the network segment. If the scanner’s node capacity is near its limit, a second 1756-DNB can be added to the chassis to distribute the load. For CompactLogix applications, the 1769-SDN scanner card serves the same function and is compatible with the same RSNetWorx configuration workflow.

Power supply integrity is critical during any overload relay replacement. The 1606-XLP power supply series provides stable 24 V DC control power for the 193-EC2DD’s control circuit and is commonly found in the same control cabinet. Where the existing power supply is undersized or aging, replacing it concurrently with the overload relay reduces the risk of nuisance trips during commissioning.

For facilities that also need to update their HMI layer, a PanelView Plus 7 terminal connected to the ControlLogix controller can display real-time motor current and fault status sourced from the 193-EC2DD’s DeviceNet data, without requiring additional field wiring. Signal isolators such as the 1492-AIFM series may be required where analog output signals from the overload relay are routed to legacy analog input cards with different signal ranges.

Finally, for engineers who need to commission or troubleshoot the DeviceNet segment during the retrofit, a 1784-U2DN USB-to-DeviceNet interface cable provides a direct connection from a laptop running RSNetWorx to the live network, enabling node scanning, EDS upload, and parameter verification without interrupting the rest of the network.

Retrofit Guidance FAQ

Q: Can I replace my existing E3 Plus overload relay with the 193-EC2DD without modifying my PLC program?
A: Yes, provided the replacement unit is configured with the same DeviceNet node address and the I/O mapping in the original program was built for an E3 Plus device. A re-download of the controller configuration is recommended but no logic changes are required.

Q: Is the wiring layout identical to the unit I am replacing?
A: For replacements within the 193 E3 Plus family, the terminal designations (A1/A2 for control, T1/T2/T3 for load) are identical. Verify control voltage compatibility before energizing.

Q: What DeviceNet baud rate does the 193-EC2DD support?
A: The 193-EC2DD supports 125 kbps, 250 kbps, and 500 kbps, selectable via front-panel rotary switch. Match the baud rate to the existing network segment setting.

Q: Will the 193-EC2DD fit in the same cabinet space as my current overload relay?
A: Yes. The 193-EC2DD shares the 45 mm width profile of the E3 Plus family and mounts to the same 193-DNDL or 193-DNDN base. No panel modifications are required for like-for-like replacements.

Q: How do I handle the EDS file for the replacement unit?
A: The EDS file for the 193-EC2DD is available from Rockwell Automation’s product compatibility and download center. Register it in RSNetWorx for DeviceNet before scanning the network to ensure correct device identification.

Q: What if my existing overload relay is hardwired and not on DeviceNet?
A: Migrating from a hardwired overload to the 193-EC2DD requires adding a DeviceNet drop cable, configuring the device in RSNetWorx, and updating the PLC program to consume the new network I/O data. TOPNLMS technical support can assist with pre-sales configuration guidance.

Warranty Assurance

Every 193-EC2DD shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to shipment, each unit undergoes functional verification including continuity testing, network communication check, and visual inspection for physical integrity. Units that fail any inspection criterion are quarantined and not shipped.

In the event of a confirmed defect within the warranty period, TOPNLMS will arrange a replacement unit or issue a refund, subject to return inspection. Our standard lead time for warranty replacements is 3–5 business days from receipt of the returned unit. For critical production environments, we recommend maintaining a spare unit on-site; TOPNLMS can supply small buffer stock quantities to support this practice.

Orders are processed within 1 business day. Shipping from our Xiamen warehouse is available via DHL Express, FedEx International Priority, and sea freight for bulk orders. Export documentation including commercial invoice, packing list, and certificate of origin is provided with every international shipment. For B2B customers requiring formal purchase orders, net payment terms are available upon credit approval.

Contact our technical sales team for pre-sales compatibility verification, bulk pricing, or expedited shipping arrangements.