Create a Function Block Diagram (FBD) program named, ScaleAnalogIn, and use a Scaler instruction to perform the scaling of the hardware that you were using at your workstation.

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

 Scaling Analog Data

• Create a new project and name the project,

• Install a 2080-IF2 and a 2080-OF2 plug-in and set them for current and

• Look up the specifications for these plug-ins so that you have enough information to scale the data. (Hint: I think you will find that these specifications are very simple and so is the scaling).

Analog Input Scaling

• Assume the hardware setup that was being used at your workstation in the lab where there was either a:

  • Transmitter that is 4mA to 20mA, 0°F to 200°F

  • Transducer that is 0Vdc to 10Vdc, -50°C to 150°C

• Create a Function Block Diagram (FBD) program named, ScaleAnalogIn, and use a Scaler instruction to perform the scaling of the hardware that you were using at your workstation, only this time use the specifications for the 2080-IF2 plug-in. The Instance name should be: InputScaling. Use the following tag names being careful to use the correct data type and scope (The data type is not being listed. This is for you to determine):

• In a comment block on the FBD sheet, list the transducer/transmitter

Variable name or I/O	Alias	Scope	Notes
max_PV_Counts		Global	Controller counts for the maximum value(s).
min_PV_Counts		Global	Controller counts for the minimum value(s).
maxProcTemperature		Global	Maximum temperature of the transmitter/transducer.
minProcTemperature		Global	Minimum temperature of the transmitter/transducer.
_EU		Global	Scaled value.
_IO_P1_AI_00	_PV		Analog input counts.

Analog Output Scaling

• Assume the hardware setup that was being used at your workstation in the lab for the analog output (Fan):

  • Transducer that accepts a 0mA to 20mA input and outputs a 0Vdc to 12Vdc

• Look back at the values you recorded for the analog output counts and the fan operating point. As an example (this is only an example, use your actual values arrived at in the lab); assume that the analog output module count range is:

29,000 𝑐𝑛𝑡𝑠 = 20𝑚𝐴−32,768 𝑐𝑛𝑡𝑠 = 0𝑚𝐴

𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑢𝑛𝑡 𝑟𝑎𝑛𝑔𝑒 = 29,000 𝑐𝑛𝑡𝑠 + 32,768 𝑐𝑛𝑡𝑠 = 61,768 𝑐𝑛𝑡𝑠

𝑇ℎ𝑒 𝑐𝑜𝑢𝑛𝑡 𝑣𝑎𝑙𝑢𝑒 𝑓𝑜𝑟 𝑡ℎ𝑒 𝑓𝑎𝑛 𝑡𝑜 just 𝑠𝑡𝑎𝑟𝑡 𝑡𝑜 𝑡𝑢𝑟𝑛 𝑤𝑎𝑠 𝑑𝑒𝑡𝑒𝑟𝑚𝑖𝑛𝑒𝑑 𝑡𝑜 𝑏𝑒: − 10,892 𝑐𝑛𝑡𝑠

Calculate the percent change from 0Vdc counts to the counts where your fan “just” starts to

turn on.−32,768 𝑐𝑛𝑡𝑠 − (−10,892 𝑐𝑛𝑡𝑠) = −21,876 𝑐𝑛𝑡𝑠

|−21,876 𝑐𝑛𝑡𝑠|

∴     61,768 𝑐𝑛𝑡𝑠     ∗ 100 ≈ 35%

Now, let’s assume that after looking up the specifications for the 2080-OF2 plug-in you find that for 0mA to 20mA the counts are 214 counts or 16,384 counts (This is not the actual specification for the 2080-OF2 plug-in). Then,

16,384 𝑐𝑛𝑡𝑠 = 𝐹𝑎𝑛 𝑓𝑢𝑙𝑙 𝑠𝑝𝑒𝑒𝑑 100%

16,384 𝑐𝑛𝑡𝑠 ∗ 35% = 5,734 𝑐𝑛𝑡𝑠

∴ 𝑚𝑎𝑥𝐹𝑎𝑛𝑆𝑝𝑒𝑒𝑑  = 16,384 𝑐𝑛𝑡𝑠

𝑚𝑖𝑛𝐹𝑎𝑛𝑆𝑝𝑒𝑒𝑑  = 5,734 𝑐𝑛𝑡𝑠

All we are doing is simulating is operating range of your fan based on the values read in the lab and the specifications of the 2080-OF4. That said…your number will be different then what was used in this example.

• Create a Function Block Diagram (FBD) program named, ScaleAnalogOut, and use a Scaler instruction to perform the scaling of the hardware that you were using at your workstation only this time use the specifications for the 2080-IO2 plug-in. The Instance name should be: OutputScaling. Use the following tag names being careful to use the correct data type and scope (The data type is not being listed. This is for you to determine):

Variable name or I/O	Alias	Scope	Notes
max_CV_Counts		Global	Controller counts for fan at 100%
min_CV_Counts		Global	Controller counts for fan at 0%
maxFanSpeed		Global	Fan speed in % (100%)
minFanSpeed		Global	Fan Speed in % (0%)
desiredFanSpeed		Global	User input of desired fan speed in the range of 0% to 100%.
_IO_P2_AO_00	_CV		Analog output counts.

• In a comment on the ScaleAnalogOut FBD page, specify the fan count values recorded in the lab and specify the count values to use for the 2080-OF2.

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