Allen-Bradley 1793-OB16P ArmorBlock Upgrade Solution

Product Overview

Allen-Bradley 1793-OB16P ArmorBlock Upgrade Solution: Seamless Transition from Legacy I/O Systems

The Allen-Bradley 1793-OB16P is a 16-point, 24VDC sourcing digital output module from Rockwell Automation’s ArmorBlock 1793 Series — a field-proven, IP67-rated distributed I/O platform designed for harsh industrial environments. As the 1793 Series approaches end-of-life and spare parts become increasingly scarce, plant engineers and system integrators are actively seeking verified replacement and upgrade paths that minimize downtime, preserve existing wiring infrastructure, and maintain compatibility with existing ControlLogix, CompactLogix, and FlexLogix controller platforms.

TOPNLMS stocks the 1793-OB16P and its compatible ecosystem components, providing a reliable procurement channel for MRO buyers, OEM integrators, and automation engineers managing legacy system continuity or phased migration projects.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration away from aging 1793-OB16P installations rarely involves a single module swap. In practice, the upgrade process touches multiple layers of the control architecture. When the 1793-ADN DeviceNet adapter that hosts the ArmorBlock I/O node reaches end-of-life alongside the output module, engineers typically evaluate a parallel migration to the 1794 FLEX I/O platform, retaining the same ControlLogix or CompactLogix controller while replacing the field I/O subsystem. In this scenario, the 1794-ADN DeviceNet adapter for FLEX I/O provides a direct communication-layer equivalent, preserving the existing DeviceNet trunk cable, termination resistors, and node addressing without requiring a network redesign.

On the output side, the 1794-OB16 FLEX I/O 16-point 24VDC digital output module offers a functionally equivalent replacement with the same point count and voltage class, though the physical wiring must be transitioned from ArmorBlock M12 connectors to the FLEX I/O terminal base wiring system — specifically the 1794-TB3 or 1794-TB32 terminal base, which accommodates standard 0.5mm² to 2.5mm² field wiring. This transition is well-documented in Rockwell’s migration guides and is a common retrofit path executed during scheduled maintenance windows.

For installations where the DeviceNet network itself is being retired in favor of EtherNet/IP, the 1788-EN2DN EtherNet/IP-to-DeviceNet linking device allows the existing ArmorBlock 1793 nodes — including the 1793-OB16P — to remain operational while the upper network layer is modernized. This approach is particularly valuable in phased migration projects where full I/O replacement is deferred to a later capital expenditure cycle.

Input-side parity is equally important during output module replacements. The companion 1793-IB16 ArmorBlock 16-point 24VDC digital input module shares the same housing, adapter, and power architecture as the 1793-OB16P, making it a natural co-replacement candidate when the full ArmorBlock node is being refreshed. Similarly, the 1793-IE8 analog input module and 1793-OE4 analog output module are frequently sourced together when a complete ArmorBlock I/O station is being rebuilt or upgraded.

Power integrity is a critical consideration in any I/O migration. The 1606-XLP power supply series from Allen-Bradley is commonly specified to provide stable 24VDC rail power to ArmorBlock and FLEX I/O nodes, ensuring that output modules like the 1793-OB16P receive clean, regulated power within the 20.4–26.4VDC operating range. Where panel space is constrained, the 1606-XLP60E (60W DIN-rail mount) is a compact and reliable choice.

For engineers managing the programming side of the migration, the 1784-U2DHP USB-to-DH+ interface cable and the 1747-UIC USB-to-DH485 adapter are commonly used to maintain connectivity to legacy SLC 500 or MicroLogix controllers during the transition period, while Studio 5000 Logix Designer handles the ControlLogix-side I/O configuration for the replacement modules.

Retrofit Guidance FAQ

Q: Can I replace the 1793-OB16P without rewiring the field devices?
A: Yes, if you are replacing with another 1793-OB16P unit. The M12 quick-disconnect connectors used by the ArmorBlock platform allow module-level replacement without disturbing field wiring. If migrating to FLEX I/O (1794-OB16), field wiring must be re-terminated to the FLEX terminal base.

Q: Will my existing DeviceNet configuration and node address be preserved?
A: Yes. The node address is set on the 1793-ADN adapter, not the output module itself. Replacing the 1793-OB16P does not affect the DeviceNet node address or the I/O mapping in your RSLogix 5000 / Studio 5000 project, provided the adapter is retained.

Q: Is the 1793-OB16P compatible with ControlLogix and CompactLogix controllers?
A: Yes, via a DeviceNet scanner module (e.g., 1756-DNB for ControlLogix or 1769-SDN for CompactLogix). The module appears as a standard DeviceNet I/O device in the I/O tree and is configured using RSNetWorx for DeviceNet.

Q: What is the physical installation space requirement?
A: The 1793-OB16P uses the standard ArmorBlock form factor. No additional panel space is required for a like-for-like replacement. For FLEX I/O migration, account for the 1794 terminal base width (approximately 35mm per module slot) in your panel layout.

Q: Can the module be replaced under power (hot-swap)?
A: The 1793 ArmorBlock platform does not support hot-swap. The DeviceNet node must be taken offline and 24VDC I/O power removed before module replacement. Plan for a controlled shutdown window of approximately 15–30 minutes for a single-node swap.

Q: What programming changes are needed after replacement?
A: For a like-for-like 1793-OB16P replacement, no programming changes are required. For migration to 1794-OB16 FLEX I/O, the I/O module must be re-added to the Studio 5000 project under the appropriate DeviceNet scanner, and output tag mappings must be verified and updated in the ladder logic or function block program.

Warranty Assurance

Every 1793-OB16P unit shipped by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each module undergoes a pre-shipment functional inspection to verify output channel integrity, connector condition, and labeling accuracy. Units are shipped in anti-static packaging with appropriate cushioning to prevent transit damage.

In the event of a warranty claim, TOPNLMS provides a straightforward replacement or refund process. Contact our technical support team at [email protected] with your order number and a description of the fault. Our team targets an initial response within 1 business day. Replacement units are dispatched from our Xiamen warehouse, with express shipping options available to minimize system downtime.

For time-critical MRO procurement, TOPNLMS maintains buffer stock of high-demand ArmorBlock and FLEX I/O modules to support same-day or next-day dispatch for verified orders. Volume pricing and blanket order arrangements are available for OEM integrators and plant maintenance teams managing multi-site inventories.

We understand that unplanned downtime in industrial environments carries significant operational and financial consequences. Our procurement guarantee is simple: verified stock, accurate specifications, traceable sourcing, and responsive after-sales support — backed by a 12-month warranty on every unit.