Difference between Allen Bradley PLC's

[Akif KC 0]

Hi all,

I am starting a new topic again because it is different topic.

Can someone please explain me what is the difference between the Compact Guardlogix 1769 PLC's vs 1756 PLC's? Thank you very much guys. :)

[kaiser_will 65]

Big differences between the 2 platforms in my opinion...local I/O modules that can be used, CPU specs (i.e., number of CIP axes, number of tasks, etc.).

1769 GuardLogix (i.e., 5370 GuardLogix) can utilize 1769 (i.e., CompactLogix) I/O modules in local rack.  http://literature.rockwellautomation.com/idc/groups/literature/documents/pp/1769-pp014_-en-p.pdf

1756 GuardLogix is a two-PLC solution with a primary processor and a safety processor that utilizes 1756 (ControlLogix) I/O modules in local rack.  http://literature.rockwellautomation.com/idc/groups/literature/documents/td/1756-td001_-en-p.pdf

As a machine designer, the deciding factors between the two will be PLC power [(simple machine, few motion axes) vs. (extensive I/O, many motion axes)] or I/O module family desired.