Siemens v1.0 Service Manual download pdf (Page 157)

Example "PID control"

4.7 Integrate temperature comparison as condition in control program

STEP 7 Basic V10.5

Getting Started, 12/2009, A5E02651459-01

157

6. In the operand placeholder beneath the instruction "Greater than or equal to" enter the

value "73.0" and in the operand placeholder beneath the instruction "Less than or equal

to" the value "77.0".

7. Click the "Save project" button on the toolbar to save the project.

Result

You have programmed the temperature value as condition for driving the conveyor. The

conveyor is set into motion when the machine is in operation and at least one of the following

conditions is satisfied:

● The light barrier "LS1" is activated and the temperature in the heating chamber is

between 73°C and 77°C. This means:

– The "LS_1" tag has the signal state "1".

– The value of the "temperature" tag is between "73" and "77".

● The milk has been pasteurized. In this case the "milk_pasteurized" tag has the signal

state "1".

In the next section you will adjust the link of the status light in the HMI screen.

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Siemens v1.0 Service Manual Page 157