semilogical
Jul 11 2007, 02:14 PM
In the SLC-500's the data file S2 - Status has most everything you need to know what is happening inside the processor. I've been trying to find the same information block in the Control Logix Platform. To date I haven't found any pre-structured tags that indicates the status of the processor.
Anyone know where I can look?
Also, in the same line, is there a watchdog setup for the system that indicated a heartbeat that can be used when messaging another processor? We are trying to maintain a system health tag that we can use in the system.
b_carlton
Jul 11 2007, 02:24 PM
In ControlLogix most of the system informaton can be read using the GSV command. You have to specify exactly what you want to read and prepare an appropriate memory tag as the destination. Similarly, using the SSV command, you can set parameters in the system. They dont't have many directly addressable values or bits as you had in the SLC 'S' registers.
In the software go to 'Help' then 'Instruction Help'. Find the GSV button. Scroll to the very bottom and check out GSV/SSV Objects. This should get you going.
BobLfoot
Jul 11 2007, 03:00 PM
One thing to remember about GSV and SSV Instructions they are scan hogs taking 5 to 9 times longer than an MOV to execute. IF scan time is critical to your project be sure an condition your GSV SSV and fire them only as needed.
rpraveenkum
Jul 12 2007, 12:21 AM