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PLC Fundamentals
Scan cycle, IEC 61131-3 languages, addressing, data types, timers, and counters. Built from the same standards ISA and PLCopen test against.
1
In a standard PLC scan, when do physical outputs actually change state?
2
Why can reading a physical input twice in the same scan give the same value even if the field signal changed?
3
Which set are all defined programming languages in IEC 61131-3 (3rd edition)?
4
On a Siemens S7, what does the address %I4.2 refer to?
5
What is the signed value range of a 16-bit INT?
6
Which data type should you use to store a measured temperature like 72.5 degrees?
7
On an Allen-Bradley Logix controller, in what units is a timer .PRE value entered?
8
What does a TON (on-delay timer) do?
9
A CTU (count-up) counter sets its Done bit when:
10
On Allen-Bradley, which instruction is the equivalent of a Siemens normally-open contact?
11
Before reaching into a machine to clear a jam on a running line, the correct first action is to: