S5 AWL Command: SPA (Unconditional Jump)

SPA jumps unconditionally to a label (Sprungmarke). The jump is always executed regardless of the VKE state. In S7, SPA remains SPA (identical syntax).

Syntax#

SPA =M001          // Jump to label M001
...
M001: U E 0.0      // Label M001

S7 Equivalent#

Code Example — Skip a Section#

U   E 0.0
SPB =M010          // If E 0.0 = TRUE, jump to M010
L   KF +0          // This only executes if E 0.0 = FALSE
T   MW 20
SPA =M020          // Skip past M010 code

M010: L KF +100    // This executes if E 0.0 = TRUE
T   MW 20

M020: NOP 0        // Both paths continue here

This pattern implements an IF/ELSE structure. In SCL: IF E0_0 THEN MW20 := 100; ELSE MW20 := 0; END_IF;

Common Patterns#

• SPA after SPB: Creates IF/ELSE (SPB jumps to THEN, SPA skips to END)
• SPA at end of CASE branch: Jumps past other cases
• SPA =M999 as "exit block early": Jumps to BE at the end

Related: SPB (Conditional Jump) | SPBN (Jump if NOT)#

Part of the S5 AWL Command Reference. Maintained by PLCcheck.ai.

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