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asim_rana

"out Of Buffer Memory" Fault In Contrologix

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We are using redundant contollogix for two different applicators PCS & SIS on an offshore plant. Some of feedbacks are coming in PCS system which we had to make available in SIS similarly a few trip commands are in SIS which needs to be in PCS. We are using ENBT/A cards in both systems and both are on a same workgroup. Now I had added ENBT & processor of SIS under ENBT of PCS system similarly ENBT & processor of PCS under ENBT of SIS. Now when I apply message command i am getting data fine. The only issue is that ENBT & Controller are having faulty status & fault code is 16#0301 connection request error out of buffer memory I had even configured it through RS networx for Ethernet but fault is still there due to which iam getting I/Os not responding error. But message command is working fine and we are getting data but fault is there. Any help Thanks

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You are runnig out of unconnected buffers please see this technote G20181 - ControlLogix unconnected buffers or use Common Procedures manual for instructions on how to increase amount of unconnected buffers Edit: I did not catch that this is redundand system - redundancy simply does not support any I/O or produced/consumed over ethernet. Edited by Contr_Conn

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you need to increase the number of unconnected buffers which is by default 10 in a CLX CPU. you can increase this number upto 40 this is done by sending a generic CIP MSG to the CPU itself see the above technote also you cannot do produce-consume tags over etherNET/IP in a redundant system.so you have to use messaging only regards Nilesh"SURYA

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Do you have any produced and consumed tags? This is not supported in a redundant Ethernet setup. Only Controlnet supports produced and consumed tags in a redundant setup. This will give you the same error and sounds more like your problem since your I/O light is blinking If you are not using any produced and consumed tags how many messages do you have? Edit - Didn't see Contr_Conn edit. He already stated the same thing. And I think just having the redundant processor in the I/O configuration will do this but I am not sure. I have never used a redundant Ethernet setup. Maybe Contr_Conn can verify this Edited by TWControls

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TW - Redundancy simply can do produced/consumed only over controlnet. Ethernet will not work. With L55 and ver 13 you can have 2 processors in each redundancy rack and use P/C over the backplane. Ethernet with redundancy simply does not support any scheduled connection. Edited by Contr_Conn

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Just to clarify, a scheduled connection would include having the redundant processor off of the ENBT in the I/O configuration. Is that correct or is it only if you schedule a produced or consumed tag?

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TW: - with redundancy you don't do produce and consume between pair of redundand processors - redundancy module does all crossloads. Just treat it as one device. If you want to produce and consume data between one redundancy system to another (or just a single processor) - then Ethernet will not work. You can't add anything below ENBT in I/O configuration. Once you add a remote ENBT or processor, consumer side will try to establish connection and genereate error immidiately, before a consumer tag created. I/O configuration is not a place holder for modules, by putting module there you are building connection. All illegal connections will have errors. Technically any communication module should not be in I/O configuration if it is not involved in I/O control or used on the consumer side. Edited by Contr_Conn

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Thanks, just wanted to make sure I understood. Here a lot of people having this problem

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