MSTR block help

Hi All,
I am using a 434 12A CPU in a Quantum PLC and programming it with Concept V2.6 SR2. I am needing to sequentially execute 36 MBP_MSTR blocks. Is there a limitation on how many can be used in one program segment. I know there can only be 4 in total being executed at any one time. I presently have three.

In this 36 sequencing, the first 13 are OK. The remainder have the error bit permanently on. I have checked for duplicated variuable use, and eliminated this issue.

Can any one help me?????

Thanks,

Hey, no worries all found the answer. The control word must have 4x address, not just a declared varaible name. When I fixed this all working OK.