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CPU315 Redundancy problem with IM-153-2

Created by: john Enthu at: 9/16/2008 3:36 PM (11 Replies)

9/16/2008 3:36 PM	Rate (0)
john Enthu Posts: 69 Rating: (0)	Dear Sir, i have S7-300 Redundant System with CPU-315-2 DP and one ET200M Station. it is running fine while both cpu's are active and working OK. when i chageover the CPU, then also, it works fine and all outputs and data is retained. My Problem: When i put CPU-A in Stop Mode and CPU-B in RUN Mode and theni powered the PLC Panel, then i am not getting my outputs activated. Also, note that after starting the PLC Panel, i am getting IM-1 Active (Active and On LED indication glowing)and IM-2 standby(only On indication glowing). is it right? ( i communicated with siemens person locally, he said that if CPU-B is running, then IM-2 must be active.). If i put IM-1 power supply down, then i am getting IM-2 Activated. then, i am getting outputs as per my logic and programs. I dont understand that ifCPU-Bis in RUN Mode and CPU-A is in Stop Mode, then why IM-1 is getting activated?. why not IM-2 getting activated.? If this problem is of redundancy configured, then please, let me have proved redundancy that can be configured in my system for this type of problem solution. what may be the reason behind this.........? Please, help me.....
john Enthu Posts: 69 Rating: (0)
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9/16/2008 6:21 PM	Rate (0)
JMJ Posts: 487 Rating: (45)	When you did your HW config, did you use "Edit->insert redundant copy" to create DP master system on the second PLC?
JMJ Posts: 487 Rating: (45)
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9/17/2008 3:32 AM	Rate (0)
torunyusuf Posts: 12 Rating: (0)	Hi If you mean everything works well but when A stop and B runPLC panel power cut than turn on power IM-1 active....... It is interesting problem.. I think for creat a good redundancy system you must use UPS on the PLC panel becauseredundancy is important for PLC fault, not power cut selametle yusuf torun
torunyusuf Posts: 12 Rating: (0)
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9/17/2008 6:27 AM	Rate (0)
john Enthu Posts: 69 Rating: (0)	Dear Sir, i used Edit-->insert redundant only. i am saying power up means i am switching off the power supply of PLC and then againg switching on the same. at this moment, i should get proper system to work. i dont understand that why IM-1 is getting activated. why not IM-2? please, suggest me the solution.
john Enthu Posts: 69 Rating: (0)
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9/17/2008 2:43 PM	Rate (0)
007 Posts: 34 Rating: (0)	Dear John Enthu, Please check the supply voltage coming to IM-2 module. I think somewhere supply voltage coming to IM-2 module is get down either bacuase of IM-1 module power connection or somewhere else. Please check the profubus communication between CPU 1 & 2 with IM-1 & 2 respectively. Regards, Rajesh
007 Posts: 34 Rating: (0)
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9/19/2008 8:11 AM	Rate (0)
john Enthu Posts: 69 Rating: (0)	Dear 007, supply voltage for IM-1, IM-2, CPU-1, CPU-2 is common. Also, checked the profibus cables connections. mainissue is: when i put both the cpu in RUN Mode and then i creat any fault, redundancy works very fine. no problem comes at this time. but in CPU-1-Stop and CPU-2 RUn mode case, if i powering up the panel, at that time, IM-1 is getting activated. not IM-2.........? Why? hope someone can help me..... regards.
john Enthu Posts: 69 Rating: (0)
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9/20/2008 8:41 AM	Rate (0)
Sulung Bronze Member Joined: 5/26/2007 Last visit: 12/14/2024 Posts: 127 Rating: (3)	I don't think your redundancy is working. it looks to me that your cpu is working independently. yes it seems like it is working until you turn one of the cpu off. try this: re-create your ob100. i have a problem before, both of my cpu look like they are working, i turn both of it on and everything is find. i turn either one of the cpu it works fine until i just turn cpu b, and nothing happen. i re-create the ob100 for both cpu and it works great.

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9/20/2008 8:42 AM	Rate (0)
Sulung Bronze Member Joined: 5/26/2007 Last visit: 12/14/2024 Posts: 127 Rating: (3)	one more thing, go online for both cpu, delete everything in the blokcs before you download your new program. good luck

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9/25/2008 8:34 AM	Rate (1)
H-H Platinum Member Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (309)	Please make sure that redundancy is working by monitoring status word. I believe redundancy is not working. Please, check your status word ineach case (when you think redundancy is working and when you have this problem) in both CPUs and tell us how things are going. Attachment STATUS_WORD.JPG (420 Downloads)

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Posts: 14

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Dear John,

I am facing the similar problem. I have taken status in all conditions. Pls check if anyone can help.

Sr. No.	Test Procedure	Parameter	Status
1	Power Up Panel. CPU-A : Run CPU-B : Run IM-1 : Not active , IM-2 : Active	CPU-A MODE	Reserve
		CPU-B MODE	Master
		A: DB5.DBW8	1000 0000 0000 0110
		B: DB5.DBW8	1000 0000 0000 1001

2	B --> A changeover. CPU-A : Run CPU-B : Run/Stop IM-1 : Active , IM-2 : Not active	CPU-A MODE	Master
		CPU-B MODE	Reserve
		A: DB5.DBW8	1000 0000 0000 0101
		B: DB5.DBW8	1000 0000 0000 1010

3	A --> B changeover. CPU-A : Run/Stop CPU-B : Run IM-1 : Not active , IM-2 : Active	CPU-A MODE	Reserve
		CPU-B MODE	Master
		A: DB5.DBW8	1000 0000 0000 0110
		B: DB5.DBW8	1000 0000 0000 1001

4	Panel Power Off. Put CPU-B in Stop mode. Power up Panel. CPU-A : Run, CPU-B : Stop, IM-1:Not active, IM-2 : Active	CPU-A MODE	Master
		CPU-B MODE	Reserve
		A: DB5.DBW8	1000 0000 0010 0101
		B: DB5.DBW8	1000 0000 0000 1001

5	Put CPU-B in run mode after No-4 condition. Change over from IM-2 to IM-1. After that we got bits status everytime wrong.	CPU-A MODE	Master
		CPU-B MODE	Reserve
		A: DB5.DBW8	1000 0000 0010 0101
		B: DB5.DBW8	1000 0000 0000 1001

With regards
Gaurav

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