The Allen-Bradley 1756-LSP is a ControlLogix GuardLogix safety partner co-processor engineered to achieve SIL 3 / PL e safety ratings. Brand new factory original surplus modules are available with quick international delivery. Ensure complete machine safety redundancy and secure your inventory spares today.
The Allen-Bradley 1756-LSP is a dedicated GuardLogix Safety Partner Controller belonging to the ControlLogix platform. This specialized hardware module functions exclusively as a co-processor alongside a primary GuardLogix controller (such as the 1756-L61S, 1756-L62S, or 1756-L63S) to establish a redundant, 1oo2 (One out of Two) voting safety architecture.
| Parameter | Specification |
|---|---|
| Model | 1756-LSP |
| Brand | Allen-Bradley / Rockwell Automation |
| Origin | USA |
| Weight | 0.36 kg |
| Dimensions | 3.5 x 14.2 x 14.5 cm (Single-slot module) |
| Backplane Current Draw | 1200 mA @ 5.1 VDC / 14 mA @ 24 VDC |
| Power Dissipation | 3.5 W |
| Thermal Dissipation | 11.9 BTU/hr |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Vibration / Shock Rating | 2 g @ 10 to 500 Hz / 30 g (Operating) |
| Discontinued Date | June 01, 2017 (Legacy safety asset) |
The 1756-LSP does not store or process independent user logic. It executes identical safety tasks in parallel with the primary safety controller. By performing cross-checking calculations on the safety data stream, the primary and partner module pair ensures fail-safe execution. This tightly coupled architecture enables the system to satisfy strict functional safety criteria up to SIL 3 (IEC 61508) and Performance Level e (PL e) / Category 4 (ISO 13849-1).
While the 1756-LSP houses internal tracking registers, it relies completely on the primary controller’s safety memory allocation. When paired with the 1756-L61S or 1756-L62S, it leverages 1 MB of safety memory, which expands to 3.75 MB when matched with a 1756-L63S processor.
Q: Can the 1756-LSP be placed in a separate chassis from the primary safety controller?
A: No. To satisfy functional safety constraints, the 1756-LSP must be installed in the slot immediately adjacent (typically to the right) of the primary GuardLogix safety controller within the same local ControlLogix chassis.
Q: What happens if the 1756-LSP safety partner faults or is removed while running?
A: Because the architecture relies on 1oo2 voting verification to achieve SIL 3 compliance, a fault or removal of the safety partner will immediately drop the safety task into a configurable fail-safe state, typically disabling safety-related outputs across the control network.
The Allen-Bradley ControlLogix 1756-L55M16 is an advanced industrial controller from the Logix5000 family, equipped with 7.5 MB of user logic memory, 208 KB of dedicated I/O memory, and a dual-CPU processor architecture that optimizes logic execution separate from chassis backplane traffic. Built for heavy-duty automation systems, it manages up to 128,000 total digital I/O points with a blistering 0.08 ms program scan time. Supporting multi-network connectivity across EtherNet/IP, ControlNet, and DeviceNet alongside producer/consumer data tag broadcasting, this processor provides the ultimate scalability, multi-language scheduling, and reliable multitasking control for complex, modern factory floor operations.
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