Allen Bradley 1756-SRM ControlLogix System Redundancy Module

FAQ

Q1: What is the Allen-Bradley 1756-SRM?
A: It is commonly listed as a ControlLogix System Redundancy Module. Rockwell’s legacy documentation identifies the corresponding module as the 1757-SRM.

Q2: What is the main function of the SRM module?
A: It provides controller-level redundancy by maintaining communication and synchronization between primary and secondary ControlLogix chassis.

Q3: How does the redundancy module communicate?
A: It uses a fiber-optic connection between the redundant chassis, with the legacy SRM supporting 62.5/125 µm multimode fiber.

Q4: How many chassis slots does the module require?
A: The SRM requires two slots in each redundant chassis.

Q5: What are the backplane current requirements?
A: The specified current draw is approximately 1.2 A at 5V DC and 20 mA at 24V DC.

Q6: What is the operating temperature range?
A: The operating temperature range is 0 to 60°C, with a storage range of −40 to +85°C.

Q7: Is the 1756-SRM still an active product?
A: The legacy SRM technology is discontinued and has been superseded by newer ControlLogix redundancy modules such as the 1756-RM2/RM3 families. Rockwell’s current documentation lists 1756-RM2 and 1756-RM3 as the newer redundancy-module families.

Q8: What are the dimensions and weight?
A: The approximate dimensions are 145 × 102 × 140 mm, and the approximate weight is 1.36 kg.

1756-SRM Allen Bradley

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