Piotr.M

L    Db100.DBW308     // Load DB100.DBW308, which in my case is number, 400

L     8                            // Load number 8
*I                                  // Multiply 400*8 // This is to cinvert DBW308 to pointer format
which will point to address 400 in the DB
LAR1                           // Put 400*8 into Address register 1.
OPN   DB101              // Open DB 101

L     DBW [AR1,P#0.0]      // Loads Word from data block which address is pointed by AR1 with
offset P#0.0 (see below). In Your case this will load L DBW400
T     Db100.DBW300        // Transfer to DB100.DBW300

you have a structure which begins from address NNNN and want to query a bit which is

stored in this structure in 10.5 you query it  A DBX[AR1,P#10.5]

Let's assume NNNN is 100 - we load AR1 with 100*8=800

and do A DBX[AR1,P#10,5] - it will query bit DBX810.5

Hi, I have a question on the addressing by pointers used in the Piotr's post (in other topic - STL help).

In the first part of the post you transfer 400 into pointer format (400 * 8) and then using pointer to load the address DBW400 by   L   DBW [AR1,P#0.0] instruction. But in the second part of your post you transfer 100 into pointer format (100 * 8) and you query the bit on DBX810.5 address (not DBX110.5) by A DBX[AR1,P#10,5]. Is it allright? Can somebody explain please? Thank you

dear hossinie,

can i ask why your DBX110.5 is triggered on and off repeatedly?

if u do not have the pulse it should be on at all time correct ?