Product Overview
The Allen-Bradley 1756-L7SP is a dedicated safety partner controller within the GuardLogix family, engineered to work alongside a primary GuardLogix L7 safety controller. This module forms a 1oo2 (one-out-of-two) safety architecture, delivering up to Safety Integrity Level 3 (SIL 3) and Performance Level e (PL e) functionality for critical industrial processes. The 1756-L7SP must be installed in the slot immediately to the right of the primary controller, ensuring seamless synchronization and redundant safety logic execution.
As part of the ControlLogix platform, the 1756-L7SP occupies two slots and draws minimal backplane current: 5 mA at 1.2 VDC and 800 mA at 5.1 VDC. Its power dissipation is rated at 2.5 W, with a thermal dissipation of 8.5 BTU/hr, making it an energy-efficient choice for safety-rated systems.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Series |
GuardLogix |
| Module Type |
Safety Partner Controller |
| Module Width |
Two (2) Slots |
| Backplane Current (5.1 VDC) |
800 mA |
| Backplane Current (1.2 VDC) |
5 mA |
| Power Dissipation |
2.5 W |
| Thermal Dissipation |
8.5 BTU/hr |
| Isolation Voltage |
30V continuous (basic insulation, USB port-to-system, type tested at 980V AC for 60 s) |
| Enclosure |
None (Open-Style) |
| Compatible Primary Controllers |
1756-L71S, 1756-L71SK, 1756-L72S, 1756-L72SK, 1756-L73S, 1756-L73SK |
| Compatible Chassis |
1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K, 1756-A17, 1756-A17K |
| Standard Power Supplies |
1756-PA50, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K |
| UPC |
10885630016495 |
Key Features & Benefits
-
SIL 3 / PL e certified architecture: The 1756-L7SP works with a primary controller to achieve the highest safety integrity levels, making it suitable for emergency shutdown and process safety applications.
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Seamless integration: Designed to pair with 1756-L71S, 1756-L72S, and 1756-L73S series controllers, the module shares the primary controller's memory—no separate user memory is required.
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Compact and efficient: Occupying only two slots, the module minimizes chassis space while consuming just 2.5 W, reducing heat load in the control cabinet.
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Robust electrical isolation: With 30V continuous isolation and type testing at 980V AC for 60 seconds, the USB port is well protected against voltage transients.
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Flexible mounting: The 1756-L7SP installs in any available slot of a compatible 1756 chassis, provided it sits immediately right of the primary controller.
Industry Applications
The Allen-Bradley 1756-L7SP excels in high-integrity safety systems across multiple industries. In oil and gas facilities, it supports emergency shutdown (ESD) systems that demand SIL 3 reliability. In automotive manufacturing, the module enables safe robot cell control and press protection. For pharmaceutical production, it ensures batch processing safety with PL e performance. Its 1oo2 architecture provides redundancy that reduces nuisance trips while maintaining fail-safe operation.
Installation & Setup Guidance
Installing the 1756-L7SP is straightforward:
- Ensure the primary GuardLogix controller is installed in the chassis.
- Insert the 1756-L7SP into the slot immediately to the right of the primary controller.
- Connect the backplane power; the module draws 5 mA at 1.2 VDC and 800 mA at 5.1 VDC.
- Use the USB port for local programming and diagnostics—observe isolation ratings (30V continuous, basic insulation).
- Verify proper seating and locking of the module to ensure reliable backplane communication.
No special wiring is required beyond standard ControlLogix backplane connections. The module is open-style, so it must be installed in a suitable enclosure to meet environmental ratings.
Compatibility & Integration
The 1756-L7SP is designed exclusively for GuardLogix L7 safety systems. It pairs with primary controllers 1756-L71S, 1756-L71SK, 1756-L72S, 1756-L72SK, 1756-L73S, and 1756-L73SK. It fits in any of the listed 1756 chassis and works with standard power supplies such as the 1756-PA50 and 1756-PB75. The module supports EtherNet/IP, DeviceNet, and ControlNet communication protocols, enabling seamless integration into existing plant networks. Programming is accomplished via RSLogix 5000/Studio 5000 using Relay Ladder Logic (RLL), Structured Text (ST), or Sequential Function Chart (SFC).
Selection Guide & Purchasing Advice
Before purchasing the 1756-L7SP, verify your primary controller model and chassis compatibility. Confirm that your power supply meets the backplane current requirements (5 mA @ 1.2 VDC, 800 mA @ 5.1 VDC). If you are upgrading an existing GuardLogix system, ensure the firmware versions of the primary and partner controllers match. PLC Source PRO offers genuine Allen-Bradley 1756-L7SP modules with fast shipping and expert support—contact us for availability and bulk pricing.