Siemens S7-200 User Manual download pdf (Page 44)

Basics (1)

What is a sequencer control?

• A control method in which a task is broken down into very

small, usually sequential, subtasks

(e.g. Motor on, feed on, feed off, ...).

• The subtasks (functions) are called steps.

• Usually one step has to be completed before the next one

is started.

• A new step becomes active when the relevant transition

condition is active.

• A step is active when the associated step flag,

e.g. M0.1 = "1".

Step number provides

unique identifier

Subtask/function of the step

(action)

Step flag

Each step is assigned a separate

memory bit (step flag). A step is

activated when the step flag is active

(= "1").

Any bit memory addresses can be

used for step flags.

Sequencer

Sequential control

- Introduction

- Basics

- Working with Sequencers

- Modification

- Solution Description, Example

- Test

Steps

Transition

condition

Active step

step flag

MX.Y = "1"

We will now solve the drill control with a

sequencer.

A step is defined for

every important

state.

Motor on

Feed on

Feed off

LatchingRevision

Pulse-Oper-

ated Switch

Off-Delay

Timer

Sequencer Appendix

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 73 74

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Siemens S7-200 User Manual Page 44

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