When programming in Ladder format the application has to be divided into Networks (Syswin) or Rungs (CX Programmer). In a Network/Rung,

• All items in a network must be joined together.
• All contacts and horizontals must be connected on their right-hand side to an output or function.
• All items in the ladder editor must be connected on their left-hand side.

Sometimes, a network/rung that is too complicated cannot be anymore displayed in ladder format. This is because there are

• Too many AND LD or OR LD instructions required - break down into smaller networks.
• Too many Temporary Relays required - break down into smaller networks.