Sel (Select), Mux (Multiplex), And Demux (Demultiplex) Instructions - Siemens SIMATIC S7-1200 System Manual

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SEL (Select), MUX (Multiplex), and DEMUX (Demultiplex) instructions

Table 8- 175 SEL (select) instruction

g:=_bool_in,

in0:-_variant_in,

in1:=_variant_in);

For LAD and FBD: Click the "???" and select a data type from the drop-down menu.

Table 8- 176 Data types for the SEL instruction

SInt, Int, DInt, USInt, UInt, UDInt, Real, LReal, Byte, Word, DWord,

Time, Date, TOD, Char, WChar

SInt, Int, DInt, USInt, UInt, UDInt, Real, LReal, Byte, Word, DWord,

Time, Date, TOD, Char, WChar

Input variables and the output variable must be of the same data type.

Condition codes: ENO is always TRUE following execution of the SEL instruction.

Table 8- 177 MUX (multiplex) instruction

k:=_unit_in,

in1:=variant_in,

in2:=variant_in,

[...in32:=variant_in,]

inelse:=variant_in);

For LAD and FBD: Click the "???" and select a data type from the drop-down menu.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

SEL assigns one of two input values to parameter OUT, depending

on the parameter G value.

MUX copies one of many input values to parameter OUT, depending

on the parameter K value. If the parameter K value exceeds (IN

then the parameter ELSE value is copied to parameter OUT.

Basic instructions

8.9 Word logic operations

0 selects IN0

1 selects IN1