3.9 Measured Data Output (Function Group MEASO)
3.9.2 Analog Measured Data Output
Analogue output of measured data is two-channel.
The user can select two of the measured values available in the P63x for output in the form of load-independent direct current. Three interpolation points per channel can be defined for specific adjustments such as adjustment to the scaling of a measuring instrument. The direct current that is output is displayed as a measured operating value.
The selected measured value is output as direct current for the duration of the set hold time MEASO: Hold time output A-x. If the selected variable was not measured, then there is no output of a measured value.
Output of measured event values
If the measured event value is updated during the hold time, the measured value output memory is cleared and the hold time is re-started. This leads to an immediate availability at the output of the updated value.
Output of measured operating values
The selected measured operating value is available for the duration of the set hold time.
After the hold time has elapsed, the current value is saved and the hold time is
re-started. If the hold time has been set to "blocked", the measured operating value that has been output will be stored until the measured data output function is reset.
Configuration of output relays assigned to the output channels
The user must keep in mind that direct current output only occurs when the output relays assigned to the output channels are configured for MEASO: Value A-x output, since the output channels would otherwise remain short-circuited (see terminal connection diagrams).
Scaling the analog display
In order to define the resolution for measured data output the measured value range in scaled form and the associated display range have to be set. One additional value for the knee point must also be defined. In this way the user can obtain an analog output characteristic similar to the characteristic shown in Figure 3-31.
Measured value range to be output
The measured value range to be output is (Mx,min ... Mx,knee ... Mx,max), with:
Mx,min: minimum value to be output
Mx,knee: Knee point value for the measured value range to be output Mx,max: maximum value to be output
This measured value range to be output is defined by setting the following parameters:
M E A S O : S c a l e d m i n . v a l . A - x
M E A S O : S c a l e d k n e e v a l . A - x
M E A S O : S c a l e d m a x . v a l . A - x
Scaling is made with reference to the complete range of values for the selected measured value (variable Mx). The complete range of values is defined by their end values Mx,RL1 and Mx,RL2. (Mx,RL1 and Mx,RL2 are listed in the S&R-103 - PC MiCOM S1 Support Software - under "minimum" and "maximum".)
Measured values Range Measured values of the
variable Mx Mx,RL1 ... Mx,RL2 Associated scaled measured
values 0 ... 1
Measured value to be output
Range
Measured values with knee-
point to be output Mx,min ... Mx,knee ... Mx,max Scaled measured values
with a scaled knee-point to be output
Mx,scal,min ... Mx,scal,knee ... Mx,scal,max with:
Mx,scal,min = (Mx,min - Mx,RL1) / (Mx,RL2 - Mx,RL1 Mx,scal,knee = (Mx,knee - Mx,RL1) / (Mx,RL2 - Mx,RL1) Mx,scal,max = (Mx,max - Mx,RL1) / (Mx,RL2 - Mx,RL1
Designation of the set
values in the data model "Scal. min. value Ax" ...
... "Scal. knee-point Ax" ...
... "Scal. max. value Ax"
P63X/EN M/Ba4 // AFSV.12.09701 D /// P631-305-403/404-610 // P632-305-403/404-610 // P633-305-404/405/406-610 // P634-305-403/404-610 3-47 Associated display range
The associated display range is defined by setting the following parameters:
M E A S O : A n O u t m i n . v a l . A - x
M E A S O : A n O u t k n e e p o i n t A - x
M E A S O : A n O u t m a x . v a l . A - x
Measured values Analog display values Measured values in the
range "Measured values to be output"
"AnOut min. val. A-x" ...
... "AnOut knee point A-x" ...
...
... "AnOut max. val. A-x"
(Value A-x valid) Measured values:
Mx,RL1 = Mx = Mx,min "AnOut min. val." (Value A-x not valid) Measured values Mx:
Mx,max = Mx = Mx,RL2 "AnOut max. val." (Value A-x not valid) Measured values Mx:
Mx < Mx,RL1 or Mx > Mx,RL2
"AnOut max. val." (Overflow)
Example for scaling of analog display ranges
Voltage A-B is selected as the measured value to be transmitted by channel A-1.
The measuring range is from 0 to 1.5 Vnom with Vnom = 100 V.
The range to be transmitted is from 0.02 to 1 Vnom
with the associated display range from 4 mA to 18 mA.
The knee-point of the characteristic is 0.1 Vnom with an associated display of 16 mA. Measured values Range
Measured values of the
variable Mx 0 V ... 150 V Associated scaled measured
values 0 ... 1
Measured values to be output
Range
Measured values with knee-
point to be output 2 V ...10 V... 100 V Associated scaled measured
values 0.013 ... 0.067 ... 0.67 with:
Mx,scal,min = (2 V - 0 V ) / (150 V - 0 V ) = 0.013 Mx,scal,knee = (10 V - 0 V ) / (150 V - 0 V ) = 0.067 Mx,scal,max = (100 V - 0 V ) / (150 V - 0 V ) = 0.67
Measured values Analog display values Measured values in the
range "Measured values to be output"
0.02 ... 0.1 Vnom ... 1 Vnom
4 mA ... 16 mA ... 18 mA
In this example the following device settings are selected:
/Parameter/Config. parameters/
Address Description Current value
056 020 MEASO: Function group MEASO With 031 074 MEASO: General enable USER Yes 053 000 MEASO: Fct. assignm. A-1 MAIN:
Voltage A-B PU 010 114 MEASO: Hold time output A-1 1.00 s
037 104 MEASO: Scaled min. val. A-1 0.013 (corresponds with 0.02 Vnom)
037 105 MEASO: Scaled knee val. A-1 0.067 (corresponds with 0.10 Vnom)
037 106 MEASO: Scaled max. val. A-1 0.667 (corresponds with 1.00 Vnom)
P63X/EN M/Ba4 // AFSV.12.09701 D /// P631-305-403/404-610 // P632-305-403/404-610 // P633-305-404/405/406-610 // P634-305-403/404-610 3-49 By setting MEASO: AnOut Min. val. A-x, the user can specify the output current
that will be output when values are smaller than or equal to the set minimum measured value to be transmitted. The setting at MEASO: AnOut max. val. A-x defines the output current that is output for the maximum measured value to be transmitted.
By defining the knee-point, the user can obtain two characteristic curve sections with different slopes. When entering this setting the user must keep in mind that only a monotonically increasing or decreasing curve is permitted (peaky or vee shapes not allowed). If the setting was not properly entered, the signal SFMON: Invalid scaling A-x will be issued.
Note:
A check of the set characteristic and its acceptance by the device, if the setting was properly entered, will only occur after the device, with the setting MAIN: Device on-line is again switched on-line.
0 2 4 6 8 10 12 14 16 18 20
0 0.02 0.1 1 1.2 1.3 1.4 1.5
Ia / mA
D5Z52KFA
Min.
output value Knee point output value Max.
output value
Mx,scal 0,013 0,067 0,667
Vnom
1,0
19Z5265A_EN
3-31 Example of a characteristic curve for analog measured data output . In this example the range starting value is = 0; also possible is directional-signed output (see corresponding example in section BCD Measured Data Output).