2.1 Composition of Basic Instructions
2-3
2.1 Composition of Basic Instructions
2.1.1 Sequence Basic Instructions
These basic instructions perform bit unit logic operations and are the basis of the relay
sequence circuit.
As shown in the illustration below, this is expressed by the combination of the relay coil
and contact.
There are several relay types which are explained in “Section 1.2”, and the relay which
can be specified depends on the instruction. Refer to the explanation of each instruction.
Example:
Read the status of
external input (X0).
Start (ST) instruction
Read the on or off status of the specified contact.
Outputs the operated result (on and off)
to the external output (Y10).
Out (OT) instruction
Output the operation result to the specified coil.
Example:
R0
R0
X0
ST
X1
OR
0
1
Y10
R0
4
OT
OT
ST
AN
Internal relay coil
Output coil
Input contacts
Address
Internal
relay
contacts
Bus line
<Ladder diagram>
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