PLC Memory Flashcards
The Compact Logix memory word consists of how many bits?
32 bits
What does Application memory consist of?
- User Program area
- Data Tables
What does System Memory consist of?
- Scratch Pad
- Executive Programs
To ensure a fail safe condition of a stop button connected to a PLC, which two conditions must be met?
- Must use a normally closed stop button contact
- An Examine Input if Closed (XIC) instruction in the program
What does XIC stand for?
Examine Input if Closed
What does XIO stand for?
Examine Input if Open
What is the maximum size of application memory?
The maximum size of application memory is specified by the manufacturer
If 4 stop buttons and 2 start buttons are used for control using a PLC, then the minimum number of wires to the start and stop buttons all placed in one location away from the PLC is how many?
7 conductors
What is the last number of an address used for an XIC or XIO instruction within a program? What does this number mean?
The last number of the instruction is the Bit Number
In the address Local:2:I.Data.14 ,what does the number 2 represent?
The Slot Number
In the address Local:2:I.Data7, what does the 7 represent?
The Bit Number
What can you determine from an I/O logical address?
Local:2:I.Data.7
- The Slot number of the assembly = 2
- Whether it is an input or an output = I
- The terminal number on the module = 7
Inside a PLC Data Area, if the input terminal is energized, what is its corresponding bit?
its corresponding bit would be “1”
What is stored within the Executive memory of a PLC
A collection of permanently stored programs
Is the User Program area of the Application Memory accessible to a PLC Programmer?
Yes
