BSL instruction in Micrologix 1500

[KEN_KACEL]

I am using the BSL instructio in a micrologix 1500. It always indexes from the 35th word bit 0. For example N17:35/0 will be where it loads the result. I do need it to be bigger than 2048 bits so I would like to start it at (N17:35/0 +2048)+1 = N17:163/0. How do I get the BSL to start at something other than n17:35/0?

 

[KEN_KACEL]

File #n17:1
Control R6:11
Bit address N17:10/0
Length 2048

 

[bernie_carlton]

Your question is confusing. Please refer to the diagram for the BSL instruction in the manual.

With the information you provided in your second post:

File #n17:1
Control R6:11
Bit address N17:10/0
Length 2048

Each transition of the input will move all the bits in N17:1 through N17:128 one place to the left with bit 15 of each word moving to bit 0 of the next higher word. The current value of N17:10/0 (which is inside the shift register!!!) wis be put in N17:1/0. The previous bit value of N17:128/15 will end up in R6:11/UL.

 

[OkiePC]

The length limit for the BSL instruction is 2048, so I think you need to cascade two BSL instructions. Have the unload position of the first one end up being the Bit Address for the 2nd one.

How many bits do you need in total?

 

[KEN_KACEL]

Found that if I move a number greater than 2048 into R6:11.LEN then the BSL will continue shifting above 2048. !!!! be creative!!!

 

[KEN_KACEL]

This instruction is nothing like the BSL HELP documents:

The control element:

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Word 0
EN

DN

ER
UL


Not Used







Word 1
Size of bit array (number of bits)















Word 2
Bit Pointer (currently not used)

 

[KEN_KACEL]

Each transition of the input will move all the bits in N17:1 through N17:128 one place to the left with bit 15 of each word moving to bit 0 of the next higher word. The current value of N17:10/0 (which is inside the shift register!!!) wis be put in N17:1/0. The previous bit value of N17:128/15 will end up in R6:11/UL.
--------------------------------------------
This is not how it works ....it will move starting at n17:35/0... That is what is confusing

 

[KEN_KACEL]

I was running the PLC program through an Emulator. This does not run like the actual hardware.