Control logix Network - PLCS.net

e_pramod · November 19th, 2005, 07:52 AM

I am working on control logix processor with no of remote rack.
ON control net with CNB module.

i required if nay one NODE is fail to communicate PLC delare a alarm on HMI, but how to i catch the particular NODE is failed

Oakley · November 21st, 2005, 05:41 AM

use a handshake

rdrast · November 21st, 2005, 07:01 AM

Handshake? I'll assume you mean, dedicate a digital output, and a digital input, with the output wired to the input, on the remote rack, and continuously toggle the output state. Then monitoring the input would show if comms exist to the rack.

It would probably be better to use GSV to get information about the state of the CNB Bridge in the main rack. Look in the ONLINE MANUALS for ControlLogix, General instructions, Input/Output GSV / Module.

Oakley · November 21st, 2005, 10:32 AM

Re-reading the exact wording, I think they are referring to the status of the CNB module? In that case, either use a GSV or a CIP message.

dash · November 23rd, 2005, 10:36 AM

Attached is an example used for detecting Ethernet IO, which will also work for ControlNet. Place code in a periodic task (typically I use 100ms).

Also, watch out for executing the GSV to rapidly. I believe there are some tech notes that disuss problems related to too many / too fast executions of GSV statements.

The comments at the top of the ladder are directly from the online help and the code was made neater than my original from help of Ken Roach.

Darren

November 19th, 2005, 07:52 AM	#1
e_pramod Member Join Date: Feb 2005 Posts: 29	Control logix Network I am working on control logix processor with no of remote rack. ON control net with CNB module. i required if nay one NODE is fail to communicate PLC delare a alarm on HMI, but how to i catch the particular NODE is failed

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November 21st, 2005, 05:41 AM	#2
Oakley Member Join Date: Oct 2004 Posts: 1,050	use a handshake

November 21st, 2005, 07:01 AM	#3
rdrast Lifetime Supporting Member Join Date: Apr 2003 Location: South Carolina Lowcountry Posts: 3,641	Handshake? I'll assume you mean, dedicate a digital output, and a digital input, with the output wired to the input, on the remote rack, and continuously toggle the output state. Then monitoring the input would show if comms exist to the rack. It would probably be better to use GSV to get information about the state of the CNB Bridge in the main rack. Look in the ONLINE MANUALS for ControlLogix, General instructions, Input/Output GSV / Module.

November 21st, 2005, 10:32 AM	#4
Oakley Member Join Date: Oct 2004 Posts: 1,050	Re-reading the exact wording, I think they are referring to the status of the CNB module? In that case, either use a GSV or a CIP message.

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