plcs

Hexadecimal number system consist of ____

16 digits

A retentive timer instruction is used to monitor total accumulated time or where an operation or process requires the process be stopped or halted momentarily

true

3 types of counters

up down up/down

A ___ can be used if a control system requires remote monitoring, data acquisition of process condition, overload motion control, overloads are programmed as normally opened

pac

4 basic components

power supply CPU input/output programmer

The memory size of a word can be ___ ___ ___ or ____

8 bit 4 bytes 8 bytes 16 bits

PLC are special purpose industrial computer designed for the control of a wide variety of machines

True

____ in a PLC refers to overriding a program input value using PLC software

Forcing

HMI is _____

Human machine interface

___ provide interface between field equipment and CPU

Input modules

____ is considered valid if its a 2 state signal successfully changed from AC to DC through the bridge rectifier accepted and passed through the threshold detector successfully debounced if AC between 80 and 132 VAC

discrete signal

Reading a PLC ladder logic a bad rule to follow would be follow the ___

current

An I/O address for terminal 14 of an input module located in slot 4 I:4/14

True

____ instructions retain their state when master control instruction is executed

latch

If you want something to stay on for a certain time after system is shut off use an ____

off delay timer

_____ control pressure regulation, temperature, regulation analog valve position

analog output

3 important steps of scan time

input state execute program output state