Short description
When enabled, the analog multiplexer SFB displays one of four pre-defined analog values, depending on input conditions.
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Connection |
Description |
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Input En |
1 on input En (Enable) switches, dependent on S1 and S2, a parameterized analog value to the output AQ. 0 on input EN switches 0 to the output AQ. |
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Inputs S1 and S2 |
S1 and S2 (selectors) for selecting the analog value to be issued. S1 = 0 and S2 = 0: The value V1 is issued |
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Parameter |
V1 to V4: Analog values (Value) that will be issued.
p: Number of decimal places |
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Output AQ |
Analog output |
Parameters V1 to V4
The values for V1 to V4 can be provided by the value of another already-programmed function:
Analog comparator: Ax - Ay
Analog threshold trigger: Ax
Analog multiplexer: AQ
PI controller: AQ
Analog Ramp: AQ
Mathematic instruction: AQ
Up/Down counter: Cnt
For the 0BA7 and later version devices, you can additionally use the actual values of the following already-programmed functions:
On-delay: Ta
Off-delay: Ta
On-/off-delay: Ta
Retentive on-delay: Ta
Wiping relay(pulse output): Ta
Edge triggered wiping relay: Ta
Asynchronous pulse generator: Ta
Stairway light switch: Ta
Multiple function switch: Ta
Stopwatch: AQ
Analog filter: AQ
Average value: AQ
Max/Min: AQ
Threshold trigger: Fre
You select the required function by the block number.
Parameter p (number of decimal places)
Parameter p applies only to the display of AQ, V1, V2, V3 and V4 values in a message text.
Timing diagram
Description of function
If input En is set, then the function issues one of four possible analog values V1 to V4 at the output AQ, depending on the inputs S1 and S2.
If the input En is not set, then the function issues the analog value 0 at output AQ.
Particular characteristics to be noted when configuring
For help on analog block parameters, refer to the Basics section.
Analog output
If you connect this special function to a real analog output, then note that the analog output can only process values from 0 to 1000. To do this, connect an additional amplifier between the analog output of the special function and the real analog output. With this amplifier you standardize the output range of the special function to a value range of 0 to 1000.
Example: additional amplifier behind an analog multiplexer.