Technical data

Working Out the Automation Concept
3.5 Creating an I/O Diagram for the Motors
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 65
3.5 Creating an I/O Diagram for the Motors
Two feed pumps and one agitator are used in our example of an industrial blending process. Each
motor is controlled by its own "motor block" that is the same for all three devices. This block
requires six inputs: two to start or stop the motor, one to reset the maintenance display, one for the
motor response signal (motor running / not running), one for the time during which the response
signal must be received, and one for the number of the timer used to measure the time.
The logic block also requires four outputs: two to indicate the operating state of the motor, one to
indicate faults, and one to indicate that the motor is due for maintenance.
An in/out is also necessary to activate the motor. It is used to control the motor but at the same
time is also edited and modified in the program for the "motor block."