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S7 300 SOFTWARE REDUNDANCY PROBLEM

Created by: rat1259 at: 12/14/2009 1:41 PM (4 Replies)

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12/14/2009 1:41 PM

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rat1259

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hello
we are testing the siemens software redundancy, we tested the hardware last week and had problem with the communication between the two stations via MPI link. since they didnt communicate, when checking the redundancy status word when could see that both stations where master.
we looked at the ob100 configuration and saw that we had the wrong MPI calls in our config of MPI_ADR according to your last rectification how come (calling mpi 4 from station A and MPI 5 from station B). this is probably why we wouldnt get the communication between the 2 stations.
we will test again later this week, but we are a sbit unsecure about the mpi adressing since we have a different hardware config from your case.
We plan to use the mpi adresses of the two cp342-5 cards that assure the redundancy link between CPU A and B. we are wondering if the MPI adresses should be those of the 2 CPU MPI 2 and 3, since the program is executed in the cpus and the CP cards are an interface between the two CP.

we will probably find it out when we test it but if anyone has any input on this configuration we are using it would be appreciated.

ps see attached our netpro config and ob100 for both stations

raphael

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redundancy.zip (292 Downloads)

Last edited by: O_Moderator at: 12/14/2009 1:53 PM

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12/20/2009 7:48 AM	Rate (0)
chintu Posts: 29 Rating: (1)	Hello Rat1259, I think there is some parameter setting error. So check once again following parameters are configured properly in OB100. CALL "SWR_START" AG_KENNUNG :='A' // PLC-Classification: A for Station A DB_WORK_NO :=DB1 // Work DB for SWR DB_SEND_NO :=DB2 // Send DB for SWR DB_RCV_NO :=DB3 // Receive DB for SWR MPI_ADR :=4 // MPI-address of other station LADDR :=256 // Base address of CP VERB_ID :=1 // Connection no. of redundancy coupling DP_MASTER_SYS_ID:=1 // Identification of DP-mastersystem (HW-config) DB_COM_NO :=DB5 // Instance-DB of FB 101 DP_KOMMUN :=1 // Identification of DP-master ADR_MODUS :=1 // Interval for CPU I/Q addressing PAA_FIRST :=0 // Address of first redundant outputbyte PAA_LAST :=1 // Address of last redundant outputbyte MB_NO :=20 // First flagbyte used within redundant user program MB_LEN :=10 // Amount of flagbytes used within redundant user program IEC_NO :=0 // First instance DB used for redundant iec counters or timers IEC_LEN :=0 // Amount of instance DBs used within redundant user program DB_NO :=30 // First DB used within redundant user program DB_NO_LEN :=5 // Amount of DBs used within redundant user program SLAVE_NO :=3 // Profibus address of first used DP-slave (IM 153-3) SLAVE_LEN :=1 // Amount of used DP-slaves SLAVE_DISTANCE :=1 // Configuration of IM 153-3 interface DB_A_B_NO :=DB13 // Send DB for non redundant data from Station A to B DB_A_B_NO_LEN :=W#16#0 // Amount of used data bytes within Send DB DB_B_A_NO :=DB13 // Receive DB for non redundant data from Station B to A DB_B_A_NO_LEN :=W#16#0 // Amount of used data bytes within Receive DB RETURN_VAL :=MW2 // Block return value EXT_INFO :=MW4 // Extended information Check all data blocks are continous & properly defined in OB100. Sometimes it creates problems in software redundancy if it is not properely configured. So be sure that you configured all parameters properly. regards chintu
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12/20/2009 7:59 AM	Rate (0)
chintu Posts: 29 Rating: (1)	Hello rat1259, I think it is not possible to achieve software redundancy using two CP342-5. We use Comsoft Profibus Redundancy switch to achieve redundancy using CP442-5 in one of our projects. So try with this switch. regards chintu
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12/20/2009 9:35 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/18/2024 Posts: 3021 Rating: (1054)	rat1259 We plan to use the mpi adresses of the two cp342-5 cards that assure the redundancy link between CPU A and B. we are wondering if the MPI adresses should be those of the 2 CPU MPI 2 and 3, since the program is executed in the cpus and the CP cards are an interface between the two CP. Hello rat1259 You can ignore the CP342-5's and CPU'sMPI addresses altogether. Instead you'll need toconfigure and use an FDL connection for the redundancy link if you intend to use the CP342-5 for this (operating mode for the CP342-5 is "No DP"). You'll then use the SWR Blocks from the AG_SEND_300 package that came with your SWR software (FC100, FB101, FC 102 and FB104). Additionally you'll need FC5 (AG_SEND) and FC6 (AG_RECV) from thethe SIMATIC_NET_CP/CP300 library and MUST not change their numbers (they are used by FB104). Your FC100 call parameters for the link will then be set up like this: MPI_ADR:=0// Irrelevant LADDR:=xyz// Base address of CP342-5 (I start address fromHWconfig) VERB_ID:=x// Connection IDof configured FDL link ("Local ID" value from NetPro. You'll most likely have a value of "0001 A000" in which case the value of "1" is your VERB_ID). I hope this helps and let us know how you went.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 2 thankful Users H-H rat1259

6/30/2010 10:45 AM	Rate (0)
rat1259 Posts: 4 Rating: (0)	Hello again, Sorry for taking ages to reply here, but there was an outside delay of the whole project which meant we couldn't properly test the software. It is now up and running properly though. Indeed as was as mentioned above there was a problem with the configuration, as we had specified a MB_LEN of 1. When this was changed to 2 it worked ok. We believe this might be due to a need for consistency across words rather than bytes, though we then wonder why this parameter is specified in bytes. Maybe you can have an odd number of bytes as long as you have more than 2. Thanks for the help all,
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This contribution was helpful to 3 thankful Users fritz H-H O_Moderator

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Created by: rat1259 at: 12/14/2009 1:41 PM (4 Replies)

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