Chapter 6 FBD Block Diagram Programming 177
MX (Multiplexer) function block
There is a maximum of 250 MX (Multiplexer) function blocks under FBD mode, and the function is same as Ladder
mode.
This special function transmits 0 or one of 4 preset values to MX current value memory by selection control coils
S1 and S2. The MX function enables simple operations to be carried out on integers.
The preset value V1~V4 can be constant or other function current value.
The table below describes the relationship between parameter and MX current value.
Control status MX output coil MX output value
MX disable 0 MX = 0
S1＝0, S2＝0
1 MX = V0
S1＝0, S2＝1
1 MX = V1
S1＝1, S2＝0
1 MX = V2
MX enable
S1＝1, S2＝1
1 MX = V3
Example:
FBD display:
Enable Input
→
Selection coil S1
→
Selection coil S2
→
Parameter
→
Parameter display:
Parameter display 1 Parameter display 2
MX current value
→
Preset value V0
→ ←
Preset value V2
Preset value V1
→ ←
Preset value V3
※ Display MX current value when running mode;
※ Preset Value V3, display code A03 when stopping mode and display current value (as example V3=00111)
when running mode;
※ Press “SEL+←→” button can convert between display1 and display2.
※ MX and V0~V3, values range from -32768~32767
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