Allen Bradley1734D-IA8XOA8SPOINTBlock DeviceNet Combination I/O Block, 8 x 120 V AC Inputs + 8 x AC Outputs, Spring-Clamp Terminations

Product Description

The 1734D-IA8XOA8S is a POINTBlock: a DIN-rail block that combines eight 120 V AC inputs and eight AC outputs with an integrated DeviceNet communication interface and removable field terminations, plus a POINTBus expansion port so you can bolt standard 1734 POINT I/O modules onto its right-hand side.

Catalogue number decode

1734 = POINT I/O platform · D = POINTBlock, meaning the DeviceNet network interface and the field terminations are built in · IA8 = eight 120 V AC inputs · X = combination module · OA8 = eight AC outputs · S = spring-clamp termination.

That last letter is the one that matters when you are matching an existing installation. The otherwise-identical 1734D-IA8XOA8 (no S) is cage clamp; this S variant is spring clamp. Same electricals, different wiring action — and a detail most distributor listings omit entirely.

Why a POINTBlock instead of an adapter plus modules:
A conventional POINT I/O drop needs a 1734-ADN or similar network adapter, then separate modules, then a 1734-TB terminal base under each one. A POINTBlock collapses that into a single part:

It is the DeviceNet node itself — no separate network adapter required. The photographs show the 5-pin DeviceNet connector and the node-address setting on the module.No separate 1734-TB terminal bases — terminations are integrated and removable, so you can unplug the wiring loom and swap the block without re-terminating. The removable terminal assembly is visible alongside the module in the photographs.24 V DC from the DeviceNet connection feeds a non-isolated DC/DC converter that generates the internal +5 V DC, powering both the block and the POINTBus expansion port for any downstream POINT I/O.The practical result is a compact, low-part-count remote AC I/O drop — useful where you have a handful of 120 V field devices a long way from the controller and no room for a full chassis.

Field power behaviour — plan for this

Applied field power connects to the internal field power bus and propagates to every module to the right of the block. If you need a different field voltage or an isolated group further along the rail, you must break the bus deliberately with a 1734-FPD field power distributor, a 1734-EP24DC, or a 1734-EPAC. Forgetting this is how mixed-voltage POINT I/O rails end up with 120 V arriving somewhere it should not.

Mounting

76.2 x 60.0 x 133.4 mm (3.0 x 2.36 x 5.25 in.). Rockwell specifies a 25.4 mm (1 in.) air gap on all sides and the DIN rail secured roughly every 200 mm — relevant because a fully populated POINTBlock rail with AC modules generates real heat in a sealed enclosure.

Lifecycle: obsolete, with no migration part
This is an end-of-life catalogue number. No Rockwell product page remains for it, the 1734D POINTBlock family has been dropped from the current 1734 selection guide, and the specific installation-instruction publication (1734-IN022) is no longer served from Rockwell’s literature library — only the general 1734-UM001 user manual survives. Rockwell publishes no migration part. Since DeviceNet itself is legacy, a modern replacement means moving to EtherNet/IP POINT I/O or a Compact 5000 drop, which is a network change and not a like-for-like swap. That is the argument for buying the exact part for a running line.

Specifications we will not quote

Because Rockwell has withdrawn the datasheet for this number, several figures a buyer would reasonably want — output current per point and per module, points per common and group isolation, on-state voltage and current, off-state leakage, POINTBus current draw, operating temperature range and the certification list — are not available from Rockwell. Distributor listings do quote numbers, but we found at least one distributor spec table for this part that contradicts itself and mislabels the module as an input-only block, so we are not repeating unverified figures here. Confirm electrical limits against 1734-UM001 or a physical inspection of the module nameplate before designing around them.

Condition and configuration

Supplied as a single block with its removable terminal assembly, in an antistatic bag rather than a retail carton. The photographs show the yellow factory “Passed” test sticker and the intact “Warranty Void If Removed” seal, the LED point indicators for the eight inputs and eight outputs, the node-address setting and the DeviceNet connector. The nameplate carries the input/output rating table, UL, CE and DeviceNet conformance marks.

Interchange and searching

Also written 1734DIA8XOA8S, 1734D-IA8XOA8-S and 1734D IA8XOA8S. Closest relatives: 1734D-IA8XOA8 (cage clamp version of this block), 1734D-IA8XOW8S (relay outputs instead of AC), 1734D-IB8XOB8E (24 V DC version). Commonly searched as “POINTBlock”, “POINT Block DeviceNet AC I/O” and “1734 combination module 8 in 8 out”.