The Allen-Bradley 1756-L7SP, also cataloged as the 1756L7SP Safety Partner Module, operates as a dedicated hardware component for safety cross-checking and SIL 3 / PLe redundancy execution within GuardLogix ControlLogix System architectures.

Product Classification & Structural Matrix

• Catalog Number: 1756-L7SP

• Alternate Catalog: 1756L7SP

• Product Series: GuardLogix Safety System

• Physical Form Factor: Two-Slot Chassis Width

Physical & Technical Specifications

Deterministic Safety Execution & Backplane Velocity

The 1756-L7SP couples directly with the primary GuardLogix safety controller over the 1756 backplane bus to deliver high-density safety logic processing. Deterministic EtherNet/IP and backplane communication protocols maintain synchronized safety task execution, ensuring fail-safe operations under strict safety SIL 3 / PLe execution deadlines without compromising backplane bus communication velocity.

Package Component List

• 1 x 1756-L7SP GuardLogix Safety Partner Module

• 1 x Factory Documentation Sheet

Module Mounting & Wiring Rules

• Adjacent Slot Placement: Install the 1756-L7SP in the slot immediately adjacent to the primary 1756-L7xS GuardLogix primary safety processor.

• Chassis Power Isolation: Turn off backplane power to the 1756 chassis before module insertion or removal to prevent electrical damage.

• Grounding Compliance: Ensure the 1756 chassis is securely grounded to the enclosure central ground bus bar following standard industrial cabinet grounding procedures.

Frequently Asked Questions

• Q: What is the primary purpose of the 1756-L7SP module?

  It serves as a dedicated coprocessor partner to enable SIL 3 and PLe safety integrity ratings for GuardLogix systems.

• Q: How many backplane slots does the 1756-L7SP occupy?

  The physical housing occupies two adjacent slots within a standard ControlLogix 1756 chassis.

• Q: What is the backplane current draw at 5.1 VDC?

  The module draws 801 mA (0.801 A) from the 5.1 VDC backplane supply rail during operation.

• Q: What is the maximum thermal dissipation for this module?

  Thermal dissipation is rated at 8.5 BTU per hour under nominal operating conditions.

• Q: Can the 1756-L7SP be used as a standalone controller?

  No, it functions exclusively as a safety partner module paired with a primary GuardLogix safety controller.

• Q: What is the total power dissipation of the 1756-L7SP?

  The internal power dissipation of the unit is rated at 2.5 W.

• Q: What backplane current is drawn from the 1.2 VDC line?

  The current draw on the 1.2 VDC backplane bus rail is strictly 5 mA.

• Q: Is power isolation required before seating the module in the chassis?

  Yes, power to the backplane chassis must be fully isolated before module installation or removal.