30.3.2.2 Variable
Type
There are nine variable types: Bit, Integer, Float, Real, Timer,
Counter, Time, Date, and PID.
Bit Variable
Variable with a 1-bit length that indicates ON/OFF with a value
of either 0 (OFF) or 1 (ON).
Integer Variable
Signed variable with a 32-bit length that has integer values of
-2147483648 (16#80000000) - 2147483647 (16#7FFFFFFF).
Float Variable
32-bit variables have a floating point value of
+/-1.175494351e-38 to +/-3.402823466e+38
and 0. You can use up to 7 decimal places.
Real Variable
64-bit variables have a floating point value of
+/-2.2250738585072014e-308 to
+/-1.7976931348623158e+308 and 0. You can use up to 15
decimal places.
Timer Variable
Use timer variables to enable timer instructions.
Timer variables consist of the following five variables.
For details on instructions, refer to Chapter 31 Logic
Instruction List.
|
Variable
|
Description
|
Setting
|
|
PT
|
Value
|
32-Bit Integer
|
|
ET
|
Current Value
|
32-Bit Integer
|
|
Q
|
Output
|
Bit
|
|
TI
|
Time Count
|
Bit
|
|
R
|
Timer Reset
|
Bit
|
Counter Variable
Use counter variables to enable counter instructions.
Counter variables consist of the following seven variables.
For details on instructions, refer to Chapter 31 Logic
Instruction List.
|
Variable
|
Description
|
Variables Settings
|
|
PV
|
Value
|
32-Bit Integer
|
|
CV
|
Current Value
|
32-Bit Integer
|
|
Q
|
Output
|
Bit
|
|
QD
|
Down Counter Output
|
Bit
|
|
QU
|
Up Counter Output
|
Bit
|
|
UP
|
Up Counter
|
Bit
|
|
R
|
Counter Reset
|
Bit
|
-
When scanning to reset the counter, the counter
will not be updated. You must scan once to reset the counter.
-
Even when clear is selected for counter
variables, PV (preset value) is retained.
 30.3.2.4 Retentive Variable
Settings
Date/Time Variable
Use date/time variables to enable date/time instructions.
Date/time variables consist of the following three
variables.
For details on instructions, refer to Chapter 31 Logic
Instruction List.
|
Variable
|
Description
|
Variables Settings
|
|
YR
|
Year (0-99)
|
32-Bit Integer
|
|
MO
|
Month (1-12)
|
32-Bit Integer
|
|
DAY
|
Day (1-31)
|
32-Bit Integer
|
Time Variable
Use time variables to enable time instructions.
The time variable consists of the following three variables.
For details on instructions, refer to Chapter 31 Logic
Instruction List.
|
Variable
|
Description
|
Variables Settings
|
|
HR
|
Hour (0-23)
|
32-Bit Integer
|
|
MIN
|
Minute (0-59)
|
32-Bit Integer
|
|
SEC
|
Second (0-59)
|
32-Bit Integer
|
PID Variable
Use PID variables to enable PID instructions.
PID variables consist of the following eleven variables.
For details on instructions, refer to Chapter 31 Logic
Instruction List.
|
Variable
|
Description
|
Variables Settings
|
|
KP
|
Constant Proportion (x1000)
|
32-Bit Integer
|
|
TR
|
Integral time (x1000)
|
32-Bit Integer
|
|
TD
|
Differential time (x1000)
|
32-Bit Integer
|
|
PA
|
Processing Deadband Range
|
32-Bit Integer
|
|
BA
|
Bias
|
32-Bit Integer
|
|
ST
|
Sampling Cycle
|
32-Bit Integer
|
|
Q
|
PID Processing Complete Flag
|
Bit
|
|
UO
|
Exceeding the Minimum Scaled Value
|
Bit
|
|
TO
|
Exceeding the Maximum Scaled Value
|
Bit
|
|
PF
|
Processing Deadband Range Flag
|
Bit
|
|
IF
|
Integral Range Processing Flag
|
Bit
|
|
