Clearing Portions of Arrays

Say i have an Array[100] and i want to clear words [5]-[60] for example. How can i do that in the PLC without putting in a bunch of CLR commands and consolidate that into one command if possible?

Easy... Clr Array[ArrayNum]
Now just set a little counter up and allow the Clr command to run when a LEQ and GEQ are true. GEQ Test A:ArrayNum Test B:5, LEQ Test A:ArrayNum Test B:60, CNT Up element is ArrayNum every scan the counter is uped and that array element is cleared.

If you want to try and clear them in one scan cycle, you might be able to pull it off with a LBL ahead of the CLR rung, and a JMP within the CLR counter rung. this would keep it running through that section until the counter causes the LEQ to go false.

Use and FAL where expression = clear value tag or 0 and set mode to all. Then either hard code .LEN or move a tag value into .LEN for the amount of tags to be cleared.

Here is a simple manual version. I used EQU instruction so I could manually enter my start and end positions.

The only trick is to use a math expression in the Destination of the FAL and add 1 to you Length because of Array starting at 0

Assuming this is in the context of Logix processors, the File Fill (FLL) is intended for this purpose. For the example given, it would be:

FLL
Source: 0 (zero)
Dest: Array[5]
Length: 56

as you can see.. several solutions.