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Network 1 Set the High and Low Temperature Limits

Load special memory bit SM0.1 to process this network in the first scan cycle only. Move the constant 0 to variable memory double word VD198 to clear the variable memory area. Move the constant 16 to variable memory word VW250 to set the 1° C value = 16. Move the constant 4000 to variable memory word VW252 to set the 0° C offset = 4000. Move the constant 300 to variable memory word VW260 to set the high temperature limit = 30° C. Move the constant 200 to variable memory word VW262 to set the low temperature limit = 20° C. Move the constant 20000 to analog output word AQW0 to initialize a 12.5 mA current.

SM0.1

+0 VD196

+16 VW250

+4000 VW252

+300 VW260

+200 VW262

+20000 AQW0

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Network 2 Calculate the Value and Enable Message 1

Load special memory bit SM0.0 to process this network every scan cycle. Move the value in analog input word AIW4 to VW200. Subtract the 0° C offset. Divide the result by the 1° C value. Multiply the remainder by 10. Divide the value in variable double word VD196 (remainder x 10) by the 1° C value. Shift the quotient by 1 decimal point to the left. Move the constant 0 to variable memory word VW198 to clear the variable memory area. Multiply the temperature value by 10. Add the result of temperature value x 10 with the value that is stored as the digit following the decimal point. Transfer the result to VW116 for display on the TD 200. Set variable memory bit V12.7 to enable message 1 for display on the TD 200.

SM0.0

AIW4

VW252 VW200

VW200

VW250 VD198

+10

VW198 VD196

VW198

VW250 VD196

VW198 VW160

+0 VW198

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+10

VW200 VD198

VW160

VW200 VW200

VW200 VW116

V12.7

1

Network 3 If Temperature Exceeds High Limit, Enable Message 2 and Turn Off Furnace

If the temperature value read in variable memory word VW200 exceeds the high temperature limit stored in VW260, set variable memory bit V12.6 to enable message 2 on the TD 200 display, reset output bit Q0.0 to turn off the furnace, and move the high temperature limit value to variable memory word VW136 to display the value as an embedded value in message 2 on the TD 200.

VW200

VW260

V12.6

Q0.0

1

VW260 VW136

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Network 4 If Temperature Drops Below Low Limit, Enable Message 3 and Turn On Furnace

If the temperature value read in variable memory word VW200 drops below the low temperature limit stored in VW262, set variable memory bit V12.5 to enable message 3 on the TD 200 display, set output bit Q0.0 to turn on the furnace, and move the low temperature limit value to variable memory word VW156 to display the value as an embedded value in message 3 on the TD 200.

VW200

VW262

V12.5

Q0.0

1

VW262 VW156

Network 5 Main Program End

End the main program.

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