I have problem with my step5-95u. When i want transfer file to PLC and message show (i.e overwrite the PB1). When i overwrite, then message show memory in PLC not adequate. So,what should i do?

 

You need to try first compressing the memory or resetting the memory. Usually when a PB or FB is deleted the header is removed but the block in the memory still occupies the space, hence compressing the memory will solve the problem.

 

Did you try compressing the memory in the PLC first?

 

I'm not try yet. OK,I will try first to reset the memory. Actually the PLC have 2 reset. reset and overall reset. Which one?

 

Compress is not the same thing as reset. You use the programming software to do a compress. When you delete a block, that leaves a hole in memory that is the size of the old block. You might have lots of free RAM, but if it's broken up into small fragments none of the open spaces might be big enough to hold the PB.

Compressing the memory squeezes the program to one end of memory, and all the free RAM together at the other end of memory. Now you can download a new block into the free RAM.

Some file systems on older operating systems used to be like this as well. You could have lots of room on the disk, but if none of the free spaces was big enough to hold the new file you couldn't save until you did a "krunch" operation on the volume.

 

Compressing memory is a menu driven function you will find it on the GUI. I am not sure which PG Unit you are using but all of them have this function. Simply pull down all the MENUs and you will find the function (unless you are using very old PG670, PG675 or PG685). You need to be online (connected to the PLC) to compress the memory.