FBD/LD Parser Error (FBDP0013): Right power-rail has wrong predecessors.
In FBD/LD networks, power flows from the left power rail (always TRUE) to the right power rail. Contacts in the network are read, coils are written. For that reason, the last object in a network which is connected to the right power rail must be at least one coil. Any other object than a coil is not allowed as this means that no result of the logical operation is written to any variable.
In your project, a contact or a FBD block output is directly connected to the right rail. The affected part of the power rail is displayed with a red background.
Error example:
In the lower rung, a coil must be inserted between the last contact and the right rail.
