Siemens and Initialization when Entering a Function Block

Ladies & Gentlemen,

Im still in the process of startng to learn Siemens PLC's, so please bear with me...


What Im trying to do is to initialize some parameters in a function block, based on an initialization request. If im setting and resetting bits on the request no problem. But how would you reset a registar to zero?

Example: (inside FB)

 

Network 1:

 

A #Initialize_Request

FP #Initialize_OS

= #Initialize

 

Network 2:

 

A #Initialize

= #Test_Bit

The above code works as I expect. If there is an initialize request, the "#Test_bit" is on for one scan. No problem.

Instread of toggling a test bit, how would I reset some values to zero?? This is what I have tried..I know it is wrong because the value I am writing to is passed back out of the function and it is always zero. Eg.. the oneshot isnt requesting the transfer of 0.00 to "out". It is constantly tranfering.

 

Network 1:

 

A #Initialize_Request

FP #Initialize_OS

= #Initialize

 

Network 2:

 

A #Initialize

A(

L 0.00

T Out

)

I hope someone can lead me into the right direction. I know what I want to do, but just dont know how to do it in the Siemens PLC.
Damn differences in PLC..

Thanks,

Andrew Evenson

Thank You

Bratt,

Thanks for your reply. It did the trick. After posting, I was trying something simular to your code, but screw something up somewhere. Thanks again.

Andrew Evenson

Just remember that, not all operations are RLO dependant. This means that you cannot use bits alone to do functions like add, transfer etc. You must use other ways of blocking the code under these circumstances such as the jump statement shown by Bratt.

Cheers