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3.1 Sequence Program

3.1.1 Sequence program description method

SEQUENCE PROGRAM EXECUTION

3.1.1 Sequence program description method

The sequence program is created with the ladder mode of GX Developer.

The ladder mode is based on the concept of a sequence circuit of relay control. It

enables programming in representation close to a sequence circuit.

In the ladder mode, programming is performed in ladder block units.

A ladder block is the minimum unit for performing sequence program operation, which

starts from the left side vertical bus bar and ends at the right side vertical bus bar.

Diagram 3.3 Ladder mode

Y121

Y122

Y123

Y124

Y120

Y124

Left side vertical bus bar N/O contact N/C contact Coil (output)

Right side

vertical bus bar

Ladder block

Step number

X100 to 105 indicate inputs.

Y120 to 124 indicates outputs.

X100

X103

X104 X105

X101 X102

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 233 234

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