2. silo Conveyor
• As the box move across the conveyor and stops at the fill
position it is filled up by the silo and moves off the conveyor
3. ProCess desCriPtion
• Currently this program consist of three modes of
operation
• Each mode can be selected with the mode select
switch
• Mode A Simply counts the number of filled boxes
• Mode B will run for a specified amount of time
• Mode C is a maintenance mode used for
troubleshooting
4. teChniCal desCriPtion
• The main program consist of nine total rungs with three sub routines
• Rung 000 : This rung allows the process to be latched or unlatched as
desired if True
• Rung 001: Will set a bit file if the process is in Mode A or Mode B if
True
• Rung 002: When this rung is True the main program will jump to sub-
routine U:3
• Rung 003: When this rung is True the main program will jump to sub-
routine U:4
• Rung 004: When this rung is True the main program will jump to sub –
routine U:5
• Rung 005: This rung allows for a temporary end for Mode C operations
• Rung 006: Controls the logic of the motor for the conveyor
• Rung 007: Controls the logic of the full light
• Rung 008: Controls the logic of the solenoid valve
• Rung 009: Ends the program
6. Mode a description
• Rung 000: Sets the start of sub U3
• Rung 001: Counts each full box with C5:0
• Rung 002: Sets a delay in order to relatch the process
once the sub counts 50 boxes
• Rung 003: Resets C5:0 to allow for the next 50
• Rung 004: Resets C5:1 in sub U4
• Rung 005: Returns the sub to the main program
• Rung 006: End of U3
8. Mode b description
• Rung 000: Sets start of sub U4
• Rung 001: Starts and restarts T4:1
• Rung 002: Counts with C5:1 each time T4:1 is done
• Rung 003: Resets C5:1
• Rung 004: Returns sub to main program
• Rung 005: End of U4
10. Mode C desCription
• Maintenance Mode
• Also causes the main program to have temporary end
• Rung 000: Start of U5
• Rung 001: Turns on motor
• Rung 002: Turns on solenoid valve
• Rung 003: Returns sub to main program
• Rung 004: End of U5
12. ConClusion
• There are still more
things that could be
added to this
program
• Every PLC program
is an ever changing
process as industry
demands change
• Chris Mills
• Michael Hilliard
• Shaun Garrison
