Instruction
In this chapter we will discuss the basic instruction set. It can divided into three categories which are as follow.
Bit instruction
beat instructions operate on a single bit of data the processor means it or reset the beat the best on the logical continuity of ladder during an operation a bit can be address as many time as the program required instruction are commonly used with output input file status filebeat file timer file counter find sequence file.
Examine if closed (XIC )
This instruction is equivalent to the normal open instruction. It is used in the ladder program to determine if a bit is ON.during the execution is the excise instruction is on or logical even when the instruction is evaluated as true. during the execution if the excise instruction is off or logical is zero then the instruction is equivalent as false.
Examine if open (XIO)
this instruction is evaluate to normally closed instruction it is used in logical program to determine if a bit is off during the execution if the excise instruction is off or logical is zero then the instruction is evaluated Astro during the execution in the access instructions on on the logical even then the instruction is evaluated as false.
Output Energized (OTE) Instruction
Anu Te structure is used in the ladder program to turn update on winter and condition are evaluated as to a bit of winter and condition are evaluated as false.
Output latch ( OTL )
this is not a type of output instruction and OTL can only turn on a bit while OTL can only turn off a bit. This instruction is along with unlatch instruction with both instruction address in the same bit.when an address is assigned to the instruction that corresponds to the address of physical output output device via to this terminal is energize when the bit is set.
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