- 4 MB user memory and 2 MB safety memory for larger GuardLogix 5570 projects
- Requires a 1756-L7SP immediately to the right with matching major and minor firmware
- Uses SD nonvolatile storage and the installed 1756-ESMCAP energy-storage module
1756-L72S is the 4 MB/2 MB GuardLogix 5570 controller for safety applications requiring more memory than the 1756-L71S.
The primary controller and 1756-L7SP form one safety pair; partner position and exact firmware alignment are essential.
Before substitution, verify both memory allocations, the validated safety signature, SD image, safety I/O and energy-storage-module status.
Availability, condition, price, and shipping time for 1756-L72S are confirmed during quotation.
Allen-Bradley 1756-L72S GuardLogix 5570 Controller Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Confirm both standard and safety project memory requirements
- Do not substitute a 2M/1M controller from family similarity alone
- Review the approved safety application after any memory-class change
- Use the USB Type B service port for temporary programming and maintenance access
- Verify the installed 1784-SD1 image before any load-on-power-up or restoration operation
- Inspect the 1756-ESMCAP status and observe the documented shutdown procedure
- Use a 1756-L7SP immediately to the right of 1756-L72S
- Match the major and minor firmware revisions of both safety-pair modules
- Repeat the required safety validation after controller or safety-project changes
- GuardLogix applications requiring 4 MB standard memory and 2 MB safety memory
- SIL 3 and Performance Level e machine-safety systems using a matched 1756-L7SP
- Distributed CIP Safety architectures using supported ControlLogix communication modules