Free Contents for Teaching PLC Programming

Our mission is to help PLC Programming educators focus on their students and provide them with the best education. This is why we have made PLC3000. This is why we provide you with all free resources below.

PLC Educative Solutions For Factory Automation

Edge Generation – ST

PLC3000 does not include Rising and Falling Edge functions. However, they can easily be generated from the available memory bits Generation in ST Generate a Rising Edge on %I0 is done by considering a memory bit, e.g. %M1, such as <img width="300" height="130" src="https://plc3000.com/wp-content/uploads/2021/05/FrontMontant-300x130.jpg" alt="" loading="lazy" srcset="https://i1.wp.com/plc3000.com/wp-content/uploads/2021/05/FrontMontant.jpg?resize=300%2C130&ssl=1 300w, https://i1.wp.com/plc3000.com/wp-content/uploads/2021/05/FrontMontant.jpg?w=533&ssl=1 533w" sizes="(max-width: 300px) 100vw, 300px" /> <pre> PROGRAM EDGE_R %M1 := %I0 AND NOT %M0; %M0 := %I0; END_PROGRAM
Generate a Falling Edge on %I1 is done by considering a memory bit, e.g. %M3

PROGRAM EDGE_F %M3 := NOT %I1 AND NOT %M2; %M2 := NOT %I1; END_PROGRAM ...
PLC Educative Solutions For Factory Automation

Counter – IL

The IEC 61131 standard offers a definition of Counters. PLC3000 integrates up and down Counters. It is necessary to define a preselection value %Ci.PV, which can be set with an integer value. The current value of a counter is set to 0 when %Ci.R is activated. The current value of a counter is set to the preselection value %Ci.PV, when %Ci.LD is activated. The current value of a counter is incremented each time the %Ci.CU input is activated, and decremented each time the %Ci.CD input is activated. A counter has two outputs; %Ci.QU goes to 1 when the current counter ...
PLC Educative Solutions For Factory Automation

Timer – ST

The IEC 61131 standart offers a definition of Timers. PLC3000 integrates only TON timers that can be set by defining the time base %Ti.TB, and the preset value %Ti.PV. The timer is triggered by activating the input %Ti.IN, and the output %Ti.Q goes to 1 when the current timer value reaches the preset value.The time bases %Ti.TB that can be declared are: 10, 100 ms; 1, 10 s; 1 min.Generation in STLet’s considering 3 timers with different time bases and preset valuesIF %S1 THEN %T0.TB := 100ms; %T1.TB := 1s; %T2.TB := 1min; %T0.PV := 3 ; %T1.PV := 2; ...
PLC Educative Solutions For Factory Automation

Counter – ST

The IEC 61131 standard offers a definition of Counters. PLC3000 integrates up and down Counters. It is necessary to define a preselection value %Ci.PV, which can be set with an integer value. The current value of a counter is set to 0 when %Ci.R is activated. The current value of a counter is set to the preselection value %Ci.PV, when %Ci.LD is activated. The current value of a counter is incremented each time the %Ci.CU input is activated, and decremented each time the %Ci.CD input is activated.A counter has two outputs; %Ci.QU goes to 1 when the current counter value ...
PLC Educative Solutions For Factory Automation

Timer – IL

The IEC 61131 standart offers a definition of Timers. PLC3000 integrates only TON timers that can be set by defining the time base %Ti.TB, and the preset value %Ti.PV. The timer is triggered by activating the input %Ti.IN, and the output %Ti.Q goes to 1 when the current timer value reaches the preset value.The time bases %Ti.TB that can be declared are: 10, 100 ms; 1, 10 s; 1 min.Generation in IL
Let’s consider three timers with different time bases and preset values LD %S1 %T0.TB := 100ms %T1.TB := 1s %T2.TB := 1min %T0.PV := 3 %T1.PV := 2 %T2.PV ...
PLC Educative Solutions For Factory Automation

Edge Generation – IL

PLC3000 does not include Rising and Falling Edge functions. However, they can easily be generated from the available memory bits Generation in IL Generate a Rising Edge on %I0 is done by considering a memory bit, e.g. %M1, such as <img width="300" height="130" src="https://plc3000.com/wp-content/uploads/2021/05/FrontMontant-300x130.jpg" alt="" loading="lazy" srcset="https://i1.wp.com/plc3000.com/wp-content/uploads/2021/05/FrontMontant.jpg?resize=300%2C130&ssl=1 300w, https://i1.wp.com/plc3000.com/wp-content/uploads/2021/05/FrontMontant.jpg?w=533&ssl=1 533w" sizes="(max-width: 300px) 100vw, 300px" /> <pre> LD %I0 ANDN %M0 ST %M1 LD %I0 ST %M0
Generate a Falling Edge on %I1 is done by considering a memory bit, e.g. %M3, such as

LDN %I1 ANDN %M2 ST %M3 LDN %I1 ST %M2 ...
PLC Educative Solutions For Factory Automation

Programming in ST

1. Example in ST Let’s considering the logical equation: %M0 = %I0.%I1+%I2. /%I3 PROGRAM LogicalFunction %M0 := %I0 AND %I1 OR %I2 AND NOT %I3; END_PROGRAM 2. Example of Grafcet in ST Let’s considering the elementary Grafcet a. Programming Transition/Transition PROGRAM TrTr (* INIT *) IF %S2 THEN %M0 := TRUE; %M1 := FALSE; END_IF (* TRANSITIONS *) IF %M0 AND %I0 THEN %M1 := TRUE; %M0 := FALSE; END_IF IF %M1 AND %I1 THEN %M0 := TRUE; %M1 := FALSE; END_IF (* ACTIONS *) %Q0 := %M1; END_PROGRAM b. Programming Transition/Transition with Crossing bits PROGRAM TrTrB (* INIT *) ...
PLC Educative Solutions For Factory Automation

Instructions in ST

The programming language Structured Text (ST) is defined by the IEC 61131 standard. It includes the instructions: := ; --> Assignment := TRUE; --> Assignment to 1 := FALSE; --> Assignment to 0 PROGRAM ... END_PROGRAM IF ... THEN ... ELSE ... END_IF FOR ... END_FOR WHILE ... END_WHILE Basic logic functions are: AND OR XOR: eXclusive OR and their complement are: AND NOT OR NOT XOR NOT : eXclusive AND Logic functions can be followed with parentheses: AND( OR( XOR( ) ) ) Comments can be added inside the symbols: (*…. *). The programming language includes two types of ...
PLC Educative Solutions For Factory Automation

Programming in IL

c. Programming Step/Step
* START LD %M1 AND %I1 OR( %M0 ANDN %I0 ) OR %S2 S %M0 R %M1 * LD %M0 AND %I0 OR( %M1 ANDN %I1 ) S %M1 R %M0 * ACTIONS LD %M1 ST %Q0 d. Programming Step/Step with Crossing Bits * START LD %M1 AND %I1 OR( %M0 ANDN %I0 ) OR %S2 ST %M10 * LD %M0 AND %I0 OR( %M1 ANDN %I1 ) ST %M11 * CROSSING LD %M10 S %M0 R %M1 * LD %M11 S %M1 R %M0 * ACTIONS LD %M1 ST %Q0 b. Programming Transition/Transition with Crossing Bits
...
PLC Educative Solutions For Factory Automation

Instructions in IL

The programming language Instruction List (IL) is defined by the IEC 61131 standard. It includes the instructions: LD: LOAD ST: STORE S: SET R: RESET the set of basic logic functions: AND OR XOR: eXclusive OR and their complement: LDN: LOAD NOT ANDN: AND NOT ORN : OR NOT To the logic functions are associated with parentheses: AND( OR( XOR( ) ) ) Comments can be added after the symbol: * ...