Specifications

SIMATIC Instructions
9-164
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
ENO
ENO is a Boolean output for boxes in LAD and FBD. If a
box has power flow at the EN input and is executed
without error, the ENO output passes power flow to the
next element. ENO can be used as an enable bit that
indicates the successful completion of an
instruction.
The ENO bit is used with the top of stack to affect power
flow for execution of subsequent instructions.
STL instructions do not have an EN input; the top of the
stack must be a logic 1 for the instruction to be executed.
In STL there is no ENO output, but the STL instructions
that correspond to LAD and FBD instructions with ENO
outputs do set a special ENO bit. This bit is accessible
with the And ENO (AENO) instruction. AENO can be
used to generate the same effect as the ENO bit of a
box. The AENO instruction is only available in STL.
AENO will perform a logical AND of the ENO bit and the
top of stack. The result of the AND operation is the new
top of stack.
Operands: None
Data Types: None
S
T
L
AENO
222 224
333
221