Test 2 PLC

With a ControlLogix 1756-L62 processor, controllers can be placed in any slot, but it is not possible to place multiple controllers in the same chassis.

False

With the ON delay timer, the delay in contact operation begins before the timer coil has been energized, or turned ON.

False

As a general rule, all input devices, except STOP buttons, are wired ____________________.

N.O.

The function or functions of the processor that can be locked out with the key switch or by using passwords are fairly standard and are the same from PLC to PLC.

False

The jump instruction (JMP) tells the processor to jump over a portion of the program.

False

The number of times an input device can be addressed and used in a programmed circuit is limited to eight.

False

The way the processor scans the program is the same from PLC to PLC.

False

The wiring diagrams show the circuit in its simplest form.

False

When the N.C. symbol is programmed in a ladder diagram, any address that is actually ON becomes logically true and power can flow.

False

____________________ instructions will remain ON, or true, even when the MCR instruction is false.

Latching Relay

In standard relay control systems, a(n) ____________________ control is often used to control power to the entire circuit or just to selected rungs.

Master

Retentive timers (RTO) can be programmed to replace ____________________ timers.

Motor Driven

A branch circuit within a branch circuit is known as ____________________.

Nesting

A(n) ____________________ is defined as a group of connected logic elements used to perform a specific function.

Network

With a parallel output configuration, all of the outputs are ON or OFF at the same time, based on the ____________________.

Network Logic

Electrical devices or components are shown in their ____________________ condition on a ladder diagram.

Normal

When the N.C. symbol is programmed in a ladder diagram, the processor views it as a request to examine the address of the contact for a(n) ___________________ condition.

OFF

To prevent unauthorized On-Line programming, a key switch is provided, either on the programming device or on the processor, to restrict the access to a monitor-only mode, or to Off-Line and monitor-only mode.

True

When a hard-wired backup control circuit is used in conjunction with a PLC to control a motor, then the overload contact on the motor starter must be wired in series with the motor coil to provide protection for the motor under both means of control, PLC and hard-wired.

True

When circuit requirements demand more time than is available from a single timer, two or more timers can be programmed together.

True

When a timer uses the format used by the Allen-Bradley timer, the preset time can be programmed with any value from 0 to 16,000.

False

A typical PLC network limitation is ____________________ series contacts per line.

10

The ____________________ is also used when debugging a new or modified program.

AFI

The Output symbol with a (?) indicates that the symbol needs a(n) ____________________.

Address

To avoid confusion when reading electrical drawings with OFF delay contacts, it must be remembered that normal refers to the coil ____________________ it has been deenergized.

After

Programming two or more timers together to extend the timing range is called ____________________.

Cascading

In an RTO, bit 13 is known as the ____________________ bit.

DN

Because the processor views the N.O. contact instruction as a request to examine a given address for an ON condition, it is referred to as a(n) ___________________ instruction.

EXAMINE ON

A network constitutes one rung of a ladder diagram that starts at the right rail and ends at the left rail.

False

An MCR zone can be nested within another MCR zone.

False

By combining two NOT gates and an AND gate, we get a NAND gate.

False

It is common practice to wire the overload contacts to an input module.

False

Jumping backward does not add to the total scan time.

False

The EXAMINE OFF instruction is only logically true when the device referenced is ON, or open.

False

___________________ contacts in a motor control circuit control the path for current flow to the output.

Hard-Wired

The NOT gate is often referred to as a(n) ____________________.

Inverter

A PLC is normally programmed using a(n) ___________________ logic-type language.

Ladder

The ____________________ has been the "working language" of electricians and electrical engineers for many years.

Ladder Diagram

Whenever the processor sees an N.O. contact in the user program, it views the contact symbol as a request to examine the address of the contact for a(n) ___________________ condition.

ON

The RSLogix software gives a(n) ____________________—Use a Larger Power Supply warning when the mix of I/O requires a larger power supply than has been selected.

OVERLOAD

____________________ programming means that the program is being developed without being connected to the process or driven equipment.

Offline

When programming using a personal computer and specialized software, a(n) ____________________ may be used to limit the access to the processor program.

Password

MCRs are sometimes called Master Control ____________________ because they reset the output to zero or OFF.

Resets

A common problem in programs that have ____________________ timers is that the timer is not accumulating time, even though the timer rung is true.

Retentive

When entering addresses, the ____________________ can be used instead of the colon (:).

Semicolon

When an MCR instruction has been programmed with no logic element preceding the instruction, it is said to be programmed _____________________.

Unconditionally

Devices or components are shown in order of importance whenever possible in a ladder diagram.

True

Ladder logic is a good choice for a programming language because it closely resembles the way circuits are hard-wired.

True

Logic gates can be combined to create very complicated control logic.

True

MCRs are often used with circuits that have off-delay timers so the circuit can be shut down completely without waiting for the timers to time out.

True

Most PLCs are designed so that any input contact (N.O. or N.C.) or output coil can be Forced On or Off.

True

Once a program is complete, it should be tested while still in the Off-Line mode.

True

The basic pneumatic timing relay is designed so that additional instantaneous contacts may be added.

True

The easiest way to avoid nesting is to remember that all branches must start at a common point, and all of the branches must end at the same location.

True

The ladder diagram, also referred to as a schematic or elementary diagram, is used by the electrician or technician to speed their understanding of how a circuit works.

True

The one-shot instruction (ONS) is an input instruction that makes the rung true for just one program scan, based on a false-to-true transition of the instruction that precedes the one-shot instruction.

True

The retentive timer lets the timer START and STOP without resetting the accumulated value to 0.

True

There are many more applications and circuits that normally require two- or three-pole devices that now only require single-pole devices when programmed for a PLC.

True

The vertical power lines (rails) of the ladder diagram represent the ____________________ of the circuit.

Voltage potential or Voltage or Potential

The ____________________ shows the circuit wiring and its associated devices in their relative physical location.

Wiring Diagram