Differences in GuardLogix Controllers

1756-L6xS

• firmware version v. 17 - 20

• battery back-up of user application

• CompactFlash for backup non-volatile memory

1756-L7xS vs. 1756-L6xS

• firmware version v. 20+

• non-volatile memory is SD card instead of CompactFlash

• Replaceable Energy Storage module for battery back-up of user application

1756-L8xES vs. 1756-L7xS

• firmware version v. 31+

• Non-replaceable Energy Storage module for battery back-up of user application

• Safety Signature has changed instead of 32-bit hexadecimal value it is a 32 character hexadecimal value stored as a SINT(33).

• Built-in Ethernet port

• Task Monitor Tool no longer works. To get similar data there is a web page on the controller itself.

See also:

http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1756-rm100_-en-p.pdf

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1756-um001_-en-p.pdf