Remote panel first scan

Hi, I was wondering if there is a bit in the PLC that I could use on a remote panel as a first scan bit when powered up if power is cycled. We have about 5 other panels off of the processor so when we do preventative maintenance on the equipment we power these panels down. When powered up there are about 5 other start buttons that need hit in various locations and was wanting to unlatch the buttons on startup of these panels. We are using all control logix. Thanks.

Check out this thread:
http://www.plctalk.net/qanda/showthread.php?t=21746

Regards,
Garry
http://www.accautomation.ca

I monitor the Module Entry Status value using GSV instructions.

When the Entry Status value becomes "4" for the first time, I know the controller has connected to the remote device. When it switches from "4" to one of the shutdown or timeout states (I don't have them at my fingertips) I know that it's been disconnected or shut down.

Thanks for the reply's I will play with this when I get back to the office. I never take my work home. I didn't know if it performed a first scan when a remote panel's power was cycled.

The remote I/O panels don't do a first scan, the controller does.
The controller talks to all the I/O on the system. This is my very, very overly simplified explanation of how the PLC (master) and remote racks (slave) communicate .
Rack 1 , rack 2, rack 3 are the slave names in my example.
The master yells to the entire network is rack 1 out there, is rack 2 out there, is rack 3 out there.
Rack 1 doesn't reply, rack 2 replies " I am here and ready talk talk" , rack 3 replies " I am here and ready to talk".
PLC yells is rack 1 out there? Rack 2 turn outputs 0,2,3,7 on, & tell me what your inputs are. Rack 3 turn outputs 0,1,5,6,7 on, & tell me what your inputs are.
Rack 2 replies what it's input status is. Rack 3 replies what it's input status is.
This happens over and over, updating inputs and outputs.
Then you power up the rack 1 and it re plies to the PLC asking rack 1 are you out there. Now the PLC treats the rack 1 just the same as rack 2 & rack 3.
While the PLC didn't get an answer from rack 1 it has a status register that Ken talked about reading with a GSV. This register is where we can see what is going on in the remote racks.




Like I said above this is a very overly simplified version of how I/O talks to the PLC. Do NOT take this a the way AB PAC talk to I/O there is a lot of behind the scenes info that I didn't include. I/O talks on a schedule, some listen only, some reply I am here but ready to work yet, etc. etc. etc.