mopS04

@rstack

Put/Get is for a maximum data of 160 byte. your pointer has a length of 1810 byte. that is too much...

 Thanks for your reply. I have run into another problem with the GET block. I  have 32 GET blocks in a FC that work fine . However when I put in more than 32 GET blocks, the GET blocks after 32 all display the error 14, even when the blocks are not being requested.   Is there a limit to the amount of GET blocks that can be on a PLC?

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new subject after Splitting from PUT Block to send all the data from a DB to another PLC 

hi rstack,

that may depend on what PLC you have. Thea have a maximum Number of connections and a maximum Number of connection-instances. The Instances means the number of calling a block using a connection.

see following FAQ:

mopS04

hi rstack,

that may depend on what PLC you have. Thea have a maximum Number of connections and a maximum Number of connection-instances. The Instances means the number of calling a block using a connection.

see following FAQ:

How are the communication resources assigned in the S7-300?

hope this helps,

regards,

 Thanks for your help. The PLC running the GET blocks is  a CPU317-2 PN/DP. Yes it looks like having more than 32 GET blocks may not be possible.

William_B

.Does the PLC need to send all the information at one time?

Consider a time slicing scheme where each time increment a portion of the data is sent. Also there is nothing stopping you from using "dynamic" pointer addressing. A variable can give the pointers at ADDR_1 and RD_1 then a PUT command is multiplexed in time.

As a matter of interest.. why so much data? (It seems extreme).
Perhaps consider to use PUT function only on data that changes when it changes.
w

 I am currently attempting to put 32 Blocks in a few different FCs. I am calling each FC in turn to send the data. The data needs to be sent to a backup PLC

As it seems that it is not possible to use more than 32 GET blocks, I have changed strategy.

I now wish to use one GET block, but pass in different values for  ADDR_1 and RD_1, depending on which data block I wish to transfer.

 I understand that these parameters are pointers of type “ANY”.

For example, for the first data block  I wish to send  (first job), I would like to pass in “P#DB1.DBX0.0 BYTE 42” into    “MyAnyPointer”.

“MyAnyPointer” is then used for the  ADDR_1 and RD_1 inputs of the GET block.

For the next job, I wish to pass in “DB10.DBX0.0 BYTE64” into “MyAnyPointer”   and so on.

Could anyone advise on how to write a value to a pointer- in as simple terms as possible! The reason I ask for simplicity is I have not used indirect addressing in Step7 before.

a simple example:

first declare a Temp-Variable starting on L0.0 named e.g. myAnyPointer

      L     B#16#10                   //10h for s7
      T     LB     0
      L     B#16#04                   //type word 
      T     LB     1
      L     4                         //quantity(repitation factor)
      T     LW     2
      L     0                         //DB
      T     LW     4
      L     50                        //Starting-adress
      SLD   3                         //build Pointer
      T     LD     6
      L     B#16#83                   //Memoryarea (here Marker)
      T     LB     6

With this instructions we build this pointer: P#M50.0 WORD 4

Now we tranfer this adressed area in e.g. DB2 with SFC20

CALL SFC 20

SRCBLK :=#myAnyPointer

RET_VAL:=MW200

DSTBLK :=P#DB2.DBX 26.0 BYTE 8

Now we copied MB50-57 to DB2 DBB26-33

Hi,

The solution that worked for us was to use 1 GET block and move different pointers into the GET block every half a second. A colleague found the attached source code online. We changed it so that a GET block is called instead of the BLK MOVE. Large amounts of data are now being transferred between the two PLCs.

Thank you for all your help.