Instruction Reference
Every ladder instruction LadderIDE can place, one page each. A page follows the same order throughout: what the instruction does, its operands, what it does on each scan, its member bits where it has a structure, and a worked example captured from the running IDE. Use the search box for a mnemonic.
XIC · XIO · OTE · OTL · OTU · ONS · OSF
Timer / Counter
Section titled “Timer / Counter”TON · TOF · RTO · TP · CTU · CTD · RES
Compare
Section titled “Compare”EQU · NEQ · LES · GRT · LEQ · GEQ · LIM · CMP
Compute
Section titled “Compute”ADD · SUB · MUL · DIV · NEG · ABS · CLR · SQR · XPY · CPT · SCP · Math functions (SIN, COS, TAN, ASN, ACS, ATN, LN, LOG, DEG, RAD)
Move / Logical
Section titled “Move / Logical”MOV · AND · OR · XOR · NOT · COP · CPS · FLL · Convert (TOI, TOD, TOR, TOS)
Shift / Sequencer
Section titled “Shift / Sequencer”BSL · BSR · SQO · SQC · SQL · FFL · FFU · LFL · LFU
Program Control
Section titled “Program Control”Motion
Section titled “Motion”MSO · MSF · MAFR · MAS · MAJ · MAM · MAG · MSR
Communication
Section titled “Communication”MSG · I2C, SPI and UART · DF1 · EtherNet/IP · Modbus TCP · Modbus RTU
Applies to LadderIDE >=1.2.2 · Last reviewed 2026-09-11