Technical data

Appendix
27.6 Sample Programs
Programming with STEP 7
650 Manual, 05/2010, A5E02789666-01
The code section of OB1 appears as shown below in the STL programming language:
Network 1 Interlocks for feed pump A
A "EMER_STOP_off"
A "Tank_below_max"
AN "Drain"
= #Enable_Motor
Network 2 Calling FB Motor for ingredient A
A "Feed_pump_A_start"
A #Enable_Motor
= #Start_Fulfilled
A(
O "Feed_pump_A_stop"
ON #Enable_Motor
)
= #Stop_Fulfilled
CALL "Motor_block", "DB_feed_pump_A"
Start :=#Start_Fulfilled
Stop :=#Stop_Fulfilled
Response :="Flow_A"
Reset_Maint :="Reset_maint"
Timer_No :=T12
Reponse_Time:=S5T#7S
Fault :="Feed_pump_A_fault"
Start_Dsp :="Feed_pump_A_on"
Stop_Dsp :="Feed_pump_A_off"
Maint :="Feed_pump_A_maint"
Motor :="Feed_pump_A"
Network 3 Delaying the valve enable ingredient A
A "Feed_pump_A"
L S5T#1S
SD T 13
AN "Feed_pump_A"
R T 13
A T 13
= #Enable_Valve
Network 4 Inlet valve control for ingredient A
AN "Flow_A"
AN "Feed_pump_A"
= #Close_Valve_Fulfilled
CALL "Valve_block"
Open :=#Enable_Valve
Close :=#Close_Valve_Fulfilled
Dsp_Open :=#Inlet_Valve_A_Open
Dsp_Closed:=#Inlet_Valve_A_Closed
Valve :="Inlet_Valve_A"