Upgrade to remove ads
Only $2.99/month

EET 275 TEST 1

Terms in this set (15)

They use entire words to store information.
Do Analog modules use individual bits or entire words
They measure physical quantities such as pressure, temperature, position, speed, flow rate, and PH concentration
Analog Modules measure what?
Voltage sensing and current sensing
What two types of Analog modules are there?
B. It is less expensive than a current sensing device
What is the advantage of a voltage sensing device over a current sensing device?

A. Faster response time
B. Less expensive
C. Less susceptible to noise
D. Less wiring
E easier to modify
C. Less susceptible to noise than a voltage sensing device.
What is the advantage of a current sensing device over a voltage sensing device?

A. Faster response time
B. Less expensive
C. Less susceptible to noise
D. Less wiring
E easier to modify
Decimal Representation is -32,768 to +32,767.
If the Voltage/Current range of an anaolog field device is -10V DC to +10V DC, what is the Decimal Representation in the PLC program.
Determines the precision to which a PLC can measure physical Quantities. Allows for these measurements to be scaled in the program and thus calculated.
Why is sensor sensitivity important?
2.5V
A pressure sensor's sensitivity is 1 mV/kPa. What is the output voltage when the sensor measure 2500 kPa?
30 kPa
A pressure sensor's sensitivity is 2 mV/kPa. If the output of the pressure sensor is 60 mV, what is the pressure being measured?
The physical measurements being measured by the sensor.
What do the Scaled values represent in the Scaling Formulas?
The Decimal representation of the values being scaled.
What do the Input values represent in the Scaling Formulas?
m = 0.0122
Offset = 100
Sv = 300 C
A PLC is used to monitor and scale the Temperature of an oven. The input sensor has a measurement range of of -300 C to 500 C and a signal range of -10 to +10 Vdc. The decimal representation of this is -32,768 to +32,767. What temperature does 16,384 correspond to?
Advantages: Works with all SLC 500, measurement resolution is not compromised.

Disadvantages: Requires multiple instructions, values for instructions mus be calculated before hand.
What are the advantages and disadvantages of Math-Based Scaling?
Advantages: Requires only one instruction

Disadvantages: Not available on SLC 500 5/01 and 5/02, may reduce resolution.
What are the advantages and disadvantages of Scaling Instruction Method?
0.83 in/V
The output signal changes from 2.3 V to 1.7 V for a measured movement of 1.5 inches to 2.0 inches. What is the sensitivity?
YOU MIGHT ALSO LIKE...