Asked by Jordan Nolte on May 03, 2024
Verified
When the program scan reaches an immediate I/O instruction, the scan is interrupted and the bits of the addressed word are updated.
Immediate I/O Instruction
In programming, instructions that allow for the direct reading or writing to I/O devices without waiting for program cycle completion.
Program Scan
One of three parts of the PLC scan. During the program scan, the CPU scans each rung of the user program.
- Understand the operation and application of instant I/O instructions and their effect on the duration of program scanning.
Verified Answer
ZK
Zybrea KnightMay 06, 2024
Final Answer :
True
Explanation :
This is because immediate I/O instructions, such as IN or OUT, are executed immediately and do not wait for the entire program to complete. Therefore, the scan must be interrupted in order to update the bits of the addressed word.
Learning Objectives
- Understand the operation and application of instant I/O instructions and their effect on the duration of program scanning.
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