474 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 11 Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT)
End of Transition (EOT)
The EOT instruction returns a boolean state to an SFC transition.
Operands:
Relay Ladder
Structured Text
The operands are the same as those for the relay ladder EOT instruction.
Description: Because the EOT instruction returns a boolean state, multiple SFC routines can
share the same routine that contains the EOT instruction. If the calling routine is
not a transition, the EOT instruction acts as a TND instruction
(see page 465
).
The Logix implementation of the EOT instruction differs from that in a PLC-5
controller. In a PLC-5 controller, the EOT instruction has no parameters.
Instead, the PLC-5 EOT instruction returns rung condition as its state. In a
Logix controller, the return parameter returns the transition state since rung
condition is not available in all Logix programming languages.
Arithmetic Status Flags: Not affected
Fault Conditions: None
Execution:
Operand Type Format Description
Data bit BOOL Tag State of the transition
(0=executing, 1=completed)
Condition Relay Ladder Action Structured Text Action
Prescan The rung-condition-out is set to false. No action taken.
Rung-condition-in is false The rung-condition-out is set to false. N/A
Rung-condition-in is true The instruction executes.
The rung-condition-out is set to true.
N/A
EnableIn is set N/A EnableIn is always set.
The instruction executes.
Instruction execution The instruction returns the data bit value to the calling routine.
Postscan The rung-condition-out is set to false. No action taken.
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