Counters
Name the two kinds of counters
Count Up Counter and Count Down Counter
In what unit does a timer count time in?
Milliseconds
What does a red PLC mean?
It is a PLC with safety programming capabilities
What is a network?
Two or more devices connected, sharing resources
Who was the commencement speaker for the 2025 FHTC graduation ceremony
David Garcilazo
Can you have a CTD instruction and a CTU instruction with the same tag name?
Yes
Name the three times of timers
RTO, TON, TOF
Tell me what is different between a PLC and a home PC if they are both computers
PLC's are slower, meant for reliability and precision. PC's prioritize getting as many things done as quickly as possible.
Public vs Private Address?
Public is open, private is password protected.
Who is the first programmer in history?
Ada Lovelace
Name all bits associated with counters
CU, CD, OV, UN, ACC, PRE, DN
What is the difference between an RTO and any other timer?
RTO will hold its ACC value when power is removed.
Who makes our hardware, who makes our software?
Allen Bradley hardware, with Rockwell software.
What is an IP address or what does it do?
Identify a device and allow it to communicate.
An AC signal, which periodically reverses its direction and changes its voltage, is incompatible with this binary ON/OFF logic. The constant oscillations and zero-crossings of an AC signal would confuse the circuit, making it impossible to hold a stable logical state.
What kind of data type is a counter?
Counter
What is a free running timer?
A timer that will run as soon as your machine is on.
What specific circuit in the PLC is it imperative to have backup power to?
The RAM circuit.
What is the difference between a MAC address and an IP address?
MAC is physically burned in and cannot be changed, whilst IP is logical and can be reassigned?
What is faster than the speed of light?
The rate of the universe's expansion.
What is the highest positive value of a 32 bit signed integer?
2,147,483,647
When does the DN bit of a TOF come true?
Any time the ACC is not equal to the PRE, the DN bit is true.
When was the first PLC made? +- 5 year tolerance
1968
When on a website, how can you tell if it is secure or not?
Check security certificate on a website, look for a lock/HTTP(S), use a third party website verifier
What is magnetic flux?
A measurement of the total amount of magnetic field lines passing through a given surface.