Virtual micro PLC

PLC in cloud

The smallest and easiest PLC of the world!

• 1 bit logic
• Only 13 instructions (coded with 4 bits)
• More than 4'000 inputs/outputs (12 bit addressing)
• unified instruction length (4+12 =16 bit)
• Instruction set according to IEC61131-3 subset
• Free available / no license fee

–› Overview Development Environment
Mnemonic Operation
Code
Remarks
LD Load
0
Input –› Res
LDN Load Not
1
NOT(Input) –› Res
ST Store
2
Res –› Output
STN Store Not
3
NOT(Res) –› Output
AND AND
4
Res AND Input –› Res
ANDN AND with Negated Operand
5
Res AND (NOT Input) –› Res
OR OR
6
Res OR Input –› Res
ORN OR with Negated Operand
7
Res OR (NOT Input) –› Res
XOR Exclusive OR
8
Res XOR Input –› Res
XORN Exclusive OR with Negated Operand
9
Res XOR (NOT Input) –› Res
JMP1 Jump if '1'
A
Jump forward if Res=1
JMP0 Jump if '0'
B
Jump forward if Res=0
JMP Jump
C
Jump forward without condition

• Jump operations are relative to the current program counter and are always in forward direction.
• JMP 0=STOP=END : Terminates the program/ Calling debugger / program stops.
• JMP 1=NOP : No Operation. The program counter is incremented by one.
• LD 0 : Constant '0' is loaded / LDN 0 : Constant '1' is loaded.

Coding example: 16 bit instruction=2A1B –› Opcode=2 and Operand=A1B –› ST A1B
Assumed A1B=Output Valve3 –› ST Valve3

That's the complete specification!