i'm trying to set up a generic CIP msg to a ControlLogix to pull the processor status (ie program, run, or fault) and throw it up on a display.  does anyone know that class/instance/attrib to grab this stuff?

The easy way would be to perform a GSV instruction in the controller itself, and then interpret the results in a simpler format (i.e. a 1,2,3,4) for the MMI screen to display.

You can do a GSV instruction to the CONTROLLERDEVICE object class, and retrieve an INT data type that contains the status of the controller.

RSLogix 5000 help describes it as follows:

Status INT Bits identify status:
Bits 3-0 are reserved

Bits 7-4 Meaning
0000 reserved
0001 flash update in progress
0010 reserved
0011 reserved
0100 flash is bad
0101 faulted
0110 run
0111 program

Bits 11-8 Meaning
0001 recoverable minor fault
0010 unrecoverable minor fault
0100 recoverable major fault
1000 unrecoverable major fault

Bits 13-12 Meaning
01 keyswitch in run
10 keyswitch in program
11 keyswitch in remote

Bits 15-14 Meaning
01 controller is changing modes
10 debug mode if controller is in Run mode

Of course, if the controller is in Program mode the GSV won't execute and you won't be able to tell.  Hmm.  

So you have to figure out what the hex codes for CONTROLLERDEVICE and STATUS are.   I wonder if my handy-dandy CIP analyzer is still around here.....

Okay, I *think* it is:

Class      0x01 hex    (Identity)
Instance 0x01 hex    (this one controller)
Attribute 0x05 hex    (Status integer)

Tuesday I'll be able to check this against a real ControlLogix and figure out if it's correct.

This was answered over at the RSLogix forum recently:

Knowbase A9411 - Checking processor status and memory usage using DDE/OPC reads from RSLinx

Applications that use DDE/OPC with RSLinx can check the status and some other processor information using predefined items in RSLinx version 2.20 and higher.

Status items:
@Status - returns a string containing the current status of the controller (OK or Faulted)
@Mode - returns a string containing the processor mode (Run, Program, Remote Run, Remote Program)
@ProcessorName - returns a string containing the processor name
@Revision - returns a string containing the processor's firmware revision

Quote (Eddie Willers @ May 24 2002,6:14)

I wonder if my handy-dandy CIP analyzer is still around here.....

what is this?  and where can i get one?