FATEK FBs-CB55 - Ladder Diagram Structure and Terminology

Chapter 5: Description of Function Instructions
5.1 The Format of Function Instructions ....................................................................... 5-1
5.1.1 Input Control........................................................................................................ 5-1
5.1.2 Instruction Number and Derivative Instructions ........................................................ 5-2
5.1.3 Operand.............................................................................................................. 5-3
5.1.4 Functions Output (FO) .......................................................................................... 5-6
5.2 Use Index Register(XR) for Indirect Addressing ..................................................... 5-6
5.3 Numbering System................................................................................................. 5-9
5.3.1 Binary Code and Relative Terminologies ................................................................. 5-9
5.3.2 The Coding of Numeric Numbers for FBS-PLC......................................................... 5-11
5.3.3 Range of Numeric Value ....................................................................................... 5-11
5.3.4 Representation of Numeric Value ........................................................................... 5-11
5.3.5 Representation of Negative Number ....................................................................... 5-12
5.4 Overflow and Underflow of Increment(+1) or Decrement(-1) ................................. 5-12
5.5 Carry and Borrow in Addition/Subtraction ............................................................... 5-13
Chapter 6: Basic Function Instructions
z T (Timer) ...................................................... 6-2
z C (Counter)..................................................... 6-5
z Set (SET) ........................................................ 6-8
z Reset (RESET) .................................................... 6-10
z Master control loop start (FUN0) ...................................................... 6-12
z Master control loop end (FUN01) .................................................... 6-14
z Skip start (FUN02) .................................................... 6-15
z Skip end (FUN03) .................................................... 6-17
z Differential up (FUN04) .................................................... 6-18
z Differential down (FUN05) .................................................... 6-19
z Bit shift (FUN06) .................................................... 6-20
z Up/down counter (FUN07) .................................................... 6-21
z Move (FUN08) .................................................... 6-23
z Move inverse (FUN09) .................................................... 6-24
z Toggle switch (FUN10) .................................................... 6-25
z Addition (FUN11) .................................................... 6-26
z Subtraction (FUN12) .................................................... 6-27
z Multiplication (FUN13) .................................................... 6-28