hello members,

at the moment i'am working with stl.  indirect adressing,  pointers,  AR1 and AR2,  accu1  and stuff like that

but searching on the internet i managed to find some stuff  propped up into a few pages.  but somehow i cannot find the clue in it.

perhaps has anyone a clear document/manual.  which explanes this stuff step by step

gr gerard

Hello,

Perhaps the following topic might help:

Siemens S7 Indirect Addressing

hello,

i'am playing a little bit with stl in step 7 and somethings........i don't get the clue

notice in my attachment. on the left side is ob1 opened with some inputs to set some bits in a datablock and on the right site an fc is opened with an instruction all is monitored with plcsim.

as  studying  fc for most of the time the rlo drew my attention

when i set i0.3 (and only i0.3) in plcsim which is set a bit in a db with the line in ob1 (B) i notice while monitoring my fc that the rlo C and D becomes high. how is it possible that an instruction an ob affects something i monitor in fc. how is that relation

gr gerard