Quickstart 750-881 - Wago
Quickstart 750-881 - Wago Quickstart 750-881 - Wago
34 Application example: Starterkit881_App1_FUP.pro WAGO-I/O-SYSTEM 750750-881 ETHERNET Programmable Fieldbus4.3 Main Program "PLC_PRG"Select the object PLC_PRG in the Modules tab in order to open the mainprogram.You will see the variable declaration in the upper part of the dialog box. Theindividual FUB networks are displayed in the lower part. You can activate thedigital outputs (Network 1 and Network 2) and call up the subprograms"UserLED" and "Blink" (Network 3 and Network 4) in the main program.Figure 30: "PLC_PRG" programQuickstart ReferenceVersion 1.1.0
WAGO-I/O-SYSTEM 750 Application example: Starterkit881_App1_FUP.pro 35750-881 ETHERNET Programmable FieldbusYou can activate the first digital output using a bistable function block "rsDO1"applying RS logic (reset = dominant).The "SET" input of the "rsDO1" function block is linked to a flank-detectingfunction block "ftrigDO1", which detects the falling flank for "xVisuDO1".The "RESET1" input is linked via a logical AND gate that evaluates the signal forflank detection "ftrigDO1.Q" and the status of the first digital output "xDO1."Figure 31: Network 1 (PLC-PRG)This linking of flank detection, AND gate, and bistable flip-flop yields thefollowing function:• If the digital output "xDO1" has not been set, then clicking thecorresponding visualization button [xVisuDO1] will set the digital output"xDO1."• If the digital output "xDO1" has already been set, then clicking thevisualization button [xVisuDO1] will result in the digital output "xDO1"being reset.4.4 Subprogram "Blink"The "Blink" subprogram is located in the Utilities folder.Figure 32: "Blink" programQuickstart ReferenceVersion 1.1.0
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WAGO-I/O-SYSTEM <strong>750</strong> Application example: Starterkit<strong>881</strong>_App1_FUP.pro 35<strong>750</strong>-<strong>881</strong> ETHERNET Programmable FieldbusYou can activate the first digital output using a bistable function block "rsDO1"applying RS logic (reset = dominant).The "SET" input of the "rsDO1" function block is linked to a flank-detectingfunction block "ftrigDO1", which detects the falling flank for "xVisuDO1".The "RESET1" input is linked via a logical AND gate that evaluates the signal forflank detection "ftrigDO1.Q" and the status of the first digital output "xDO1."Figure 31: Network 1 (PLC-PRG)This linking of flank detection, AND gate, and bistable flip-flop yields thefollowing function:• If the digital output "xDO1" has not been set, then clicking thecorresponding visualization button [xVisuDO1] will set the digital output"xDO1."• If the digital output "xDO1" has already been set, then clicking thevisualization button [xVisuDO1] will result in the digital output "xDO1"being reset.4.4 Subprogram "Blink"The "Blink" subprogram is located in the Utilities folder.Figure 32: "Blink" program<strong>Quickstart</strong> ReferenceVersion 1.1.0
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