Allen Bradley450L-E4HL0900YDGuardShield LineE Enhanced Safety Light Curtain Transceiver, 900 mm Protected Height, 30 mm Hand Resolution

Product Description

The 450L-E4HL0900YD is a GuardShield 450L-E “LineE” enhanced safety light curtain. Rockwell Automation catalogues it as a transceiver with 30 mm (1.18 in.) hand resolution and 900 mm (35.46 in.) protected height. Lifecycle status is Active — this is a current catalogue number, not an obsolete one.

What the catalogue number tells you

Within the 450L-E family the four-digit block is the protected height in millimetres: 0900 here is 900 mm, while 450L-E4HL1500YD is the 1500 mm version. These are different parts and are not interchangeable — protected height must cover the full access opening you are guarding, and a curtain that is too short leaves an unguarded gap above or below the field.

Resolution: why 30 mm matters
Rockwell rates this curtain at 30 mm hand resolution — the smallest object that is guaranteed to break a beam anywhere in the field. Resolution is what sets the minimum safety distance in the ISO 13855 / ANSI B11.19 calculation: coarser resolution means a larger required standoff from the hazard. A 30 mm hand-resolution curtain is the normal choice for guarding a machine opening where an operator’s hand or arm can reach in. If your risk assessment calls for finger detection you need a finer-resolution curtain (typically 14 mm), not this one; if only whole-body access needs detecting, a coarser 4-beam or 2-beam device is cheaper and simpler.

Quantity and configuration

Each piece is a single self-contained aluminium stick — the photographs show one housing per unit, in Allen-Bradley red and black with the catalogue number printed on the top face. Two units are in stock, which is enough to make up one complete guarded opening if your configuration takes a pair. Because Rockwell’s own catalogue description for this number is “transceiver” rather than “transmitter” or “receiver”, confirm the opposite-side component your installation requires against Rockwell’s 450L-E documentation before ordering — get the pairing wrong and you have a stick you cannot commission.

Fitting and commissioning notes

Rockwell publishes a 2-D drawing, a DXF product drawing and a 3-D STEP model for this catalogue number, so bracket and mounting-plate work can be modelled before the curtain arrives. Budget for mounting brackets, the interconnect/patchcord, and a safety relay or safety controller to accept the OSSD outputs — none of those are included here. Alignment is the usual commissioning risk on a 900 mm field: mount both sticks on a rigid common reference, not on separate sheet-metal panels that can move relative to each other.

Compliance

Safety devices are only valid as installed. The protective device must be selected and positioned from a documented risk assessment, and the safety distance recalculated for your machine’s stopping time. Verify the required performance level and the device’s rated category against the current Rockwell datasheet for your standard before commissioning — Rockwell’s public product page for this catalogue number does not publish the type/PL/SIL rating, so we do not state one here.

Interchange and searching

Also written 450L-E4HL0-900YD and 450LE4HL0900YD. GuardShield is Rockwell’s safety light curtain sub-brand; the 450L family superseded the earlier 440L GuardShield generation, so buyers replacing a 440L will find the mounting and wiring differ.