MET 284 Final
Determine the number of bits used to represent a DINT using the Micro850 PLC.
32
The hysteresis range for the ladder logic is ___________?
5
Which of the following best describes the power supply terminals +24VDC and -24VDC used in control systems.
A differential DC system where the +24VDC terminal is measured at +24V with respect to the -24VDC terminal and both are independent of ground (common).
When a sourcing input module is activated, conventional current flows __________ its terminal.
Out of
A TOF timer rung is false and the ACC value is less than the PRE value, so the ________ timer bits are true.
Both the TT and DN
Which of the following statements about dedicated industrial electronic counters (not PLC function blocks) is NOT true?
Electronic counters cannot be used over an elapsed time period because non-reset styles are not available.
The following sequence occurs: E is 15 and I goes TRUE; with I TRUE, A transitions (LOW to HI to LOW) 3 times; I then returns to FALSE and A transitions another 6 times. Which one of the following statements describes the condition of the ladder logic at the conclusion of this sequence?
F is off; G is on; CV is 6
An NEQ instruction is __________ when the value at source A is equal to the value at source B.
False
The CTU reset instruction is used to clear the maximum value of the counter.
False
The input of CTU is activated by a false-to-true transition of its input while the input of CTD is activated by a true-to-false transition.
False
Which of the following statements that describes the equivalent ladder logic for this FBD program is NOT true?
The input rung for the counter has two ANDed instructions with of the XIC type.
Which of the following statements that describes the equivalent ladder logic for this FBD program is NOT true?
The output is controlled by an XIO instruction with a DN bit address.
The problem statement is: If fluid_temp1 and fluid_temp2 are BOOL tags, open is a BOOL tag, and your specification says: "If fluid_temp1 and fluid_temp2 are both on, set open to true. What is the required expression?
open := fluid_temp1 & fluid_temp2;
When a sinking output module is activated, conventional current flows __________ the field device to which it is connected.
out of
When a sourcing input module is activated, conventional current flows __________ its terminal.
out of
The jump command is an __________ instruction.
output
If the enable rung condition of a timer-on instruction becomes false before CV=PV, the current value __________.
resets to zero
Determine the maximum value that can be stored using a LINT variable on the Micro850.
1.84467E+19
Which of the following binary numbers is equal to negative seven?
11111001
Determine the maximum value that can be stored using a DINT variable on the Micro850.
4294967295
Which of the following statements is NOT true after the start selector is true?
B3/0 output is true for 5 seconds.
If N7:1 increased from 18 to 23 slowly then at 23 ________.
B3:1 is false
If N7:1 is below 20 for a number of scans then ________.
B3:1 is true and O:3/0 is false
A TON timer rung is active and the ACC value is greater than the PRE value, so the ________ timer bits are true.
Both the EN and DN
Which of the following ST statements is correct for the ladder logic figure below?
IF Sensor_1 AND NOT Sensor_2 THEN Valve_1 :=1;
The data compare instruction is an __________ instruction.
Input
The lower trip point is set to 10 and the upper trip point is set to 14 for a high-limit HYSTER instruction block. Which of the following could NOT be true if the input value is currently at 12.
More than one of the above conditions are NOT true.
Select the timing relay that fits this operation: after the coil is energized the NC contacts remain closed until after the time delay value.
NCTO
Select the timing relay that fits this operation: after the coil is energized, the NO contacts remain open for the time delay value and then close after the time delay.
NOTC
Select the timing relay that fits this operation: after the coil is energized the NO contacts close and remain closed as long as the coil is energized. When the coil is de-energized, the NO contacts remain close for the set time delay value.
NOTO
The lower trip point is set to 10 and the upper trip point is set to 14 for a high-limit HYSTER instruction block. Which of the following is true if the input value is currently at 9.
None of the above conditions are true
Identify the true statement for this timer circuit 35 seconds after the NO selector switch connected to terminal 1 in module 1 is turned on.
None of the above.
Identify the true statement for this timer circuit 25 seconds after the NO selector switch connected to terminal 3 in module 6 is turned off.
O:2/1 is true.
The waveform below is the action of the sensor that is addressed by I:2/13. Which one of the following statements describes the condition of the ladder logic after the waveform has been completed?
O:3/3 is off; timer ACC is 0 sec; counter ACC is 2
The waveform below is the action of the sensor that is addressed by I:2/13. The total time for the waveform is 6.5 seconds. Which one of the following statements describes the condition of the ladder logic 5 seconds after the waveform starts (half way through the 2nd 3 second segment)?
O:3/3 is off; timer ACC is 1.5 sec; counter ACC is 1
Which one of the following statements describes the condition of the ladder logic after 22 false to true to false transitions of the I:2/10 and 13 false to true to false transitions of the I:2/11 instruction? Note the current value in the ACC.
O:3/4 is on; ACC is 12
If O:3/0 increased from 18 to 23 slowly, then at 23 ________.
OTU is false
If N7:1 is below 20 for a number of scans, then ________.
OTU is true and O:3/0 is false
Which of the following is NOT a structure of an arithmetic instruction?
Only an operand
The lower trip point is set to 10 and the upper trip point is set to 14 for a high-limit HYSTER instruction block. Which of the following is true if the input value is currently at 16.
Q is active and external feedback is attempting to force the input to 10 before deactivating.
The ________ bit of the CTUD instruction block is only true when CV is zero or less.
QD
The _____ bit of the CTUD instruction block is only true when CV is greater than or equal PV.
QU
An input of 16055 is provided to AnalogInput_Real in the following function. Will the function run to completion or trigger an error? SCALE_AI := SCALAR(AnalogInput_Real,Value_4mA, Value_20mA, SCL_Min, SCL_Max); Value_4mA := 13107.0;Value_20mA := 65535.0; AnalogInput_Real := Any_To_Real(AnalogInput);IF AnalogInput_Real > Value_4mA AND AnalogInput_Real < Value_20mA THENError := FALSE;ELSEError := TRUE;END_IF;
Run to Completion
An input of 16055 is provided to AnalogInput_Real in the following function. Will the function run to completion or trigger an error? SCALE_AI := SCALAR(AnalogInput_Real,Value_4mA, Value_20mA, SCL_Min, SCL_Max); Value_4mA := 13107.0;Value_20mA := 65535.0; AnalogInput_Real := Any_To_Real(AnalogInput);IF AnalogInput_Real > Value_4mA AND AnalogInput_Real < Value_20mA THENError := FALSE;ELSEError := TRUE;END_IF; Result := Scale_AI.Output;
Run to Completion
An input of 16055 is provided to AnalogInput_Real in the following function. Will the function run to completion or trigger an error?SCALE_AI := SCALAR(AnalogInput_Real,Value_4mA, Value_20mA, SCL_Min, SCL_Max);Value_4mA := 13107.0;Value_20mA := 65535.0;AnalogInput_Real := Any_To_Real(AnalogInput);IF AnalogInput_Real > Value_4mA AND AnalogInput_Real < Value_20mA THENError := FALSE;ELSEError := TRUE;END_IF; Result := Scale_AI.Output;
Run to Completion
Which of the following statements is NOT true after the start selector is true for 10 seconds?
T4:2 sets the off time for the output pulse to 4 seconds.
Identify the true statement for this timer circuit 15 seconds after the NO momentary push button switch connected to terminal 1 in module 1 is pressed and released.
TT is true.
Which of the following statements that describes the equivalent ladder logic for this FBD program is NOT true?
There are five inputs and two of them are XIO type.
Identify the true statement for this timer circuit 40 seconds after the NO momentary selector switch is turned on and off.
Timer_30_sec.DN is off.
Which one of the following statements describes the condition of the ladder logic after 28 false to true to false transitions of can_switch?
Total_count.ACC is 28; Package_count.ACC is 4; Shift_count.ACC is 2
An input of 9085 is provided to AnalogInput_Real in the following function. Will the function run to completion or trigger an error? SCALE_AI := SCALAR(AnalogInput_Real,Value_4mA, Value_20mA, SCL_Min, SCL_Max); Value_4mA := 13107.0; Value_20mA := 65535.0; AnalogInput_Real := Any_To_Real(AnalogInput); IF AnalogInput_Real > Value_4mA AND AnalogInput_Real < Value_20mA THEN Error := FALSE; ELSE Error := TRUE; END_IF; Result := Scale_AI.Output;
Trigger an Error
The jump instruction can reduce scan time.
True
The operation of the timer may be thrown off if they are located in rungs that are jumped over.
True
If N7:1 increases slowly from 18 to 28, then at 28, which following statement is NOT true.
When N7:1 is at 28 O:3/0 is true and B3:1 is false.
The primary output bit of the timer-on delay becomes set __________.
When the rung condition is true for the amount of time indicated by the PR value
The data compare instruction is an __________ instruction.
input
The primary output bit of the timer-off delay becomes set __________.
when the amount of time indicated by the PR value has been reached after the true-to-false transition of the rung has occurred
The primary output bit of the timer-on delay becomes set __________.
when the rung condition is true for the amount of time indicated by the PR value
