how do we change ladder to FBD
how do i change this ladder logic to FBD in CBF. Since i don't have normally close in FBD.. how do i convert this logic to FBD. Please advise..i am a beginner to programming relay logic.
Please consider it!
Voted best answer
Plsease go through basics first @ http://booksite.elsevier.com/97818561...
and try relate with functions block available in CBF. just don't blindly follow linked document as some of the function blocks are readily available.
To convert logic from ladder to FBD in CBF keep following things in mind
Ladder | FBD
Contact (NO) | Read Variable
Contact (NC) | Read variable + NOT gate(block) or just put bubble
Coil(de-energised) | Write variable
Coil(energised) | NOT gate(block) + Write variable with NOT gate(block) or just put bubble
So recommended to go through basics document linked here, CBF function blocks details manual(3BDD012514) same info available in online help. Find your ladder rung in fbd here
Hope that helps...
Simple way to covert
All Parallel Contacts use AND Gate FB
for all Series contacts use OR Gate FB
for NC contacts use inverter before the block connects
for latched coil use SR/RS flipflopes
for Normal coil use variables to store
Rest all blocks will be almost same as usage in ladder
Hope this helps you to convert