Hi,



I just wondering what type of processor chip used for the AB Logix5555 (Control Logix Processor). Is it ARM processor? Because I saw there is "Philips" logo with "ARM" characters on the chips when opened up the Logix5555 cover.

Please share if you know about it. Thanks.

Regards,
aboon78

The main CPU on a ControlLogix is a custom application-specific integrated circuit (ASIC) that A-B has built specifically for the controller. High temperature and vibration specs on the packaging, and optimized for boolean operations (traditional CPU's would be very busy masking). I actually never really looked at whose label is on the plastic but I guess it's Philips. Couldn't very well have Infineon making them, could we ?

The guts of of that chip are a closely guarded trade secret. Most A-B employees (including me) do not have any access to the low-level details of the controller. You get code names thrown around so you can tell the difference between the chip implementations (there are mid-range and high-performance versions) but no details.

One of those big chips is the backplane interface controller and the other one is the logic solver.