logicintermediatehas comments
3×8 decoder
Combinational logic with three inputs and eight outputs.
ANDORNOTschooluniversity
Program examples
Learning FBD example catalog
Ready diagrams are grouped into two tracks: boolean logic and PLC/FBD. Use level, audience, and block badges to pick a task.
Track logic
Boolean logic
TRUE/FALSE, logic operations, truth tables, and simple condition tasks.
logicintermediatehas comments
Position sensor check
XOR, mismatch detection, diagnostic output
XORschooluniversityengineer
logicbeginnerhas comments
Lamp from two buttons with AND
Lamp turns on only when Button_A and Button_B are both TRUE.
ANDschooluniversity
logicbeginnerhas comments
Lamp from two conditions with OR
The lamp turns on when at least one permissive condition is active.
ORschooluniversity
logicbeginnerhas comments
Signal inversion with NOT
NOT shows how to produce the opposite value of an input signal.
NOTschooluniversity
logicbeginnerhas comments
A AND NOT B condition
The output is active when A is TRUE and blocking condition B is FALSE.
ANDNOTschooluniversity
logicbeginnerhas comments
XOR as different states
XOR turns the output on only when two inputs differ.
XORschooluniversityengineer
logicintermediatehas comments
De Morgan's Laws in Logic Diagrams
Move negation through AND and OR and verify equivalence with a truth table.
ANDORNOTEQschooluniversityengineer
logicintermediatehas comments
Binary Half Adder
XOR and AND add two one-bit binary numbers and produce SUM and CARRY.
XORANDschooluniversityengineer
Track PLC/FBD
PLC and FBD
Start/stop, interlocks, timers, counters, triggers, and common automation diagrams.
PLC/FBDpracticalhas comments
Conveyor start/stop
SR trigger, seal-in contact, and motor command reset.
SRORANDINTERNAL_SIGNALuniversityengineer
PLC/FBDintermediatehas comments
Delayed motor start
TON timer, on-delay, and output after elapsed time.
TONuniversityengineer
PLC/FBDbeginnerhas comments
Pump start with interlock
AND logic, emergency stop, and start permissive.
ANDNOTschooluniversityengineer
PLC/FBDintermediatehas comments
RS/SR trigger
Set/Reset priority and output signal state retention.
RSSRuniversityengineer
PLC/FBDpracticalhas comments
Two-mechanism interlock
Prevent two outputs from switching on together.
ANDNOTuniversityengineer
PLC/FBDpracticalhas comments
Level alarm latch
OR, alarm latch, manual reset
ORSRuniversityengineer
PLC/FBDintermediateno comments
Drive pulse start
TP, short pulse, repeated-start protection
R_TRIGTPuniversityengineer
PLC/FBDpracticalhas comments
Auto / Manual mode
Command source selection and conflict blocking
ANDORNOTuniversityengineer
PLC/FBDpracticalhas comments
Conveyor part counter
CTU, batch preset, completion signal
R_TRIGCTUuniversityengineer
PLC/FBDintermediatehas comments
Lighting off-delay
TOF, hold output after command removal
TOFuniversityengineer
PLC/FBDbeginnerhas comments
Start/stop with Stop priority
An RS block stores the run command and resets it from Stop.
RSschooluniversityengineer
PLC/FBDintermediatehas comments
RS latch for seal-in logic
A simple retained command with separate Set and Reset inputs.
RSuniversityengineer
PLC/FBDintermediatehas comments
TON on-delay
The output becomes TRUE only after several scans with active input.
TONuniversityengineer
PLC/FBDintermediatehas comments
TOF off-delay
TOF holds the output after the command input is removed.
TOFuniversityengineer
PLC/FBDpracticalhas comments
CTU part counter
CTU counts sensor pulses and turns on when the preset is reached.
CTUuniversityengineer
PLC/FBDpracticalhas comments
90-Degree Box Pusher
A practical pneumatic pusher diagram with a start delay and limited push duration.
INTONTPOUTuniversityengineer