Rungs of PLC
These are the two main types of input instructions used in ladder logic.
XIC and XIO
To create AND logic in a program, you must arrange two XIC instructions in this specific physical configuration.
Series
This logic is used to keep an output instruction "on" even after a momentary pushbutton has been released.
Seal-in logic
This is the binary equivalent of the decimal number 35
00100011
For safety, this specific device (PB3 or PB1) should be placed in series at the very beginning of a PLC program
Emergency Stop
In ladder logic programming, all instructions must reside on this horizontal structure.
Rung
To create an OR logic element, two or more XIC instructions must be arranged in this way.
The "done bit" of an on-delay timer (TON) transitions to true only when this specific value is reached.
preset value
This is the decimal value of the 8-bit binary string 10001111
143
Before writing the logic, a student must draw this diagram to show how the pushbuttons and motors are physically connected to the PLC.
I/O diagram
This instruction resembles a set of normally closed contacts and is represented by the symbol ]/[
XIO
This logic gate symbol features two input lines and a curved back, producing an output of 1 if any input is 1.
OR
This is the primary function of a Timer Off-Delay (TOF) instruction.
delaying an output from turning off
This is the decimal value of the hexadecimal string 2DE
734
In a multi-start scenario where PB1, PB2, OR PB4 can trigger an output, the instructions must be placed in this type of branch.
Parallel Branch
This instruction resembles a set of normally open contacts and is represtended by the symbol ] [
XIC
This logic gate, often represented with a triangle and a circle, outputs the direct opposite of its input.
NOT
During the time a timer is actively counting, this specific bit is utilized to trigger secondary actions, such as turning on a blue light.
Timer Timing (TT) bit
Converting the decimal number 157 into binary results in this 8-bit string.
10011101
What logic gate uses two XIO in parallel?
NAND
What is the output instruction called?
OTE
This type of real-world hardware, requiring two separate manual triggers, is a classic example of AND logic.
Two-hand switch
This specific programming method allows an output to turn on or off only if specific inputs or other outputs are in a designated state.
program interlocking
This number system uses base-8 and is the format requested when converting the decimal value 375.
octal
What is the logic gate that uses two XIO in series?
NOR