Specifications

Using programmable controllers Programming
2 - 12
Instruction symbols
The following shows the basic instructions of sequence control.
2.6.2 Creating a program
Create a sequence program for rehearsal.
The following shows how to create a sequence program with basic devices and instruction symbols
for sequence control.
The following devices and instruction symbols are used.
● Input: "X" device
● Output: "Y" device
● Instruction symbols: , ,
Create a program that performs the following controls.
● When the X6 and X7 switches are turned on, the Y0 output lamp turns on.
● When the X8 switch is turned on, the Y6 and Y7 output lamps turn off.
The following explains the procedure to create this sequence program.
Instruction symbol Description
Open contact: Conducts when an input signal is set to ON.
Closed contact: Conducts when an input signal is set to OFF.
Coil output: Outputs data to a specified device.
Tab. 2-5: Basic instructions of sequence control
TERMINOLOGY Coil An output used when creating a sequence program.
LS70002
Fig. 2-10: Sequence program
X6
X7
X8
Y0
Y6
Y7
<Y0>
<Y6>
<Y7>
[END]
0
3
6
X7X6
X8