Output wire connector Speed Speed OCON ICON Sheet 1 Wiring elements Wire connectors are also used to connect function blocks that are on a different sheet of the same function block routine, as illustrated in Figure 15-99. The use of wire connectors can be summarized as follows: • An output wire connector, or OCON, sends a value or signal to an input wire connector, or ICON. Input reference Function block Input reference 386 Part 6 Function Block Programming • Each output wire connector must have at least one corresponding input wire connector. • Each output wire connector requires a unique tag name and the corresponding input connector must have the same name. • Multiple input wire connectors can reference the same output wire connector. This lets you share data at several points in your function block diagram. Figure 15-100 illustrates the signal flow and execution of an FBD program. The operation can be summarized as follows: • Each program scan sets all the FBD blocks starting on the left side of the signal flow and continues to evaluate all blocks according to the signal flow until the final output is determined. • The location of a block does not affect the order in which the blocks execute. Figure 15-99 OCON and ICON wire connectors. Sheet 2 Input wire connector Output reference Figure 15-100 Signal flow and execution of an FBD program. Solenoid Output wire Input wire connector connector Input reference Function block IREF OREF OCON ICON IREF IREF Function block Figure 15-98 Function block diagram wire and pins. Input pin Wire Output pin Output pin Output pin Output pin Input pin Input pins Wire Wire ... A B
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