B&B Electronics VFG3000 - Manual - Manual (Page 79)

C ONFIGURING D ATA T AGS E DITING I NTEGER T AGS
R EVISION 1 P AGE 63
M
ODE
D
ESCRIPTION
BCD to Binary The BCD value is converted to binary.
Binary to BCD The binary value is converted to BCD.
Swap Bytes in Word The lower two bytes of the value are swapped.
Swap Bytes in Long All four bytes of the value are swapped.
Swap Words The upper and lower words of the value are swapped.
Reverse Bits in Byte Bits 0 through 7 of the value are reversed.
Reverse Bits in Word Bits 0 through 15 of the value are reversed.
Reverse Bits in Long Bits 0 through 31 of the value are reversed.
Invert Bits in Byte Bits 0 through 7 of the value are inverted.
Invert Bits in Word Bits 0 through 15 of the value are inverted.
Invert Bits in Long Bits 0 through 31 of the value are inverted.
• The Setpoint properties are used to indicate whether a setpoint will be specified
for this tag, and what that setpoint will be. Setpoints are used by certain alarm
modes, and allow the state of a tag to be compared to its intended state. For
example, a tag which represents the temperature of a vessel might have a
setpoint that indicates the required temperature. This will allow an alarm to
activate if the vessel strays beyond a certain distance from its target.
• The On Write property is as described for flag variables.
T HE D ATA T AB (F ORMULAE )
The Data tab of an integer formula contains the following properties...
• The Tag Value property is used to specify the value represented by this tag. It is
typically set to a combination of other tags, linked together using math operators.
In the example above, the tag is set to be equal to the sum of two tank levels,
therefore indicating the total amount of feedstock available.
• The Scaling and Transforms properties are as described for integer variables.