Exam 24: Programmable Logic Controllers

A PLC will treat all inputs and output sources the same; they will be looked upon as a(n) ____.

Which PLC language is a BASIC style language?

The five programming languages for PLCs are the ladder diagram, the function block diagram, the instruction list, the sequential function chart and the structured graphic.

____ timers perform a timing function while receiving power. The state of the associated contact(s) do not change until the timer has timed out.

Digital input modules are available for DC inputs, AC inputs, or a mix.

The Function Block Diagram is a(n) ____ language.

Down-counters perform a counting function when the associated input element transitions from a(n) ____ to a(n) ____ state.

____ timers will retain their timed value during a loss of power.

___ coil is a nonretentive coil used to perform a latch function.

Instruction List is a low-level program best suited for small applications and fast execution.

Which is a PLC program control instruction?

Most PLCs consist of an assortment of modules (input and output), a CPU, a power supply, and a rack in which to mount the modules.

A(n) ____ output module will produce output signals that are either 0 to 10 VDC or 4 to 20 milliamperes.

____ coils revert to their de-energized state whenever the PLC is cycled from stop to run or whenever the power is cycled.

One big advantage of using point-to-point wiring of relay controls over a PLC is that the wiring is greatly simplified and reduced.