
B–61863E/15
5. LADDER DIAGRAM EDITOR
FUNCTION (PMC–SB7)
FS16i/18i/21i/0i–B PMC–SA1/SB7 MANIPULATION
913
Valid net must have following structure:
Input section
Output
section
Convergence point
Structure of valid net
”Input section” consists of contacts and functional instruction, and the
result of operations of input section is led to ”Convergence point”. After
the convergence point, there is ”Output section” that consists of coils
only. The ”Convergence point” is the nearest point to right power line,
where all connections join with each other to gather into single
connection.
Input section
Output section
Convergence point
Sample of valid net
Input section consists at least one relay or functional instruction, however,
output section may contain nothing.
Example of net with no output section
Valid net is also restricted in following rules:
– Only one function instruction is available for a net.
– Functional instruction can be placed only at last (rightmost) of input
section.
– Only coils can be contained in output section.
5.6
STRUCTURE OF
VALID NET