Siemens Simatic RTU3030C, Руководство по эксплуатации

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Program blocks
5.7 Blocks for analog value functions
RTU303xC
Operating Instructions, 06/2019, C79000-G8976-C382-06
289
Parameters Tag type / range of
values
Description
Output parameters
Output 1 .. 3
Digital output / bit
memory
Tag 1 .. 3, into which the value calculated by the block
for the respective range 1 .. 3 is output.
Output 1 must be assigned. The other two outputs are
optional. If output 3 is assigned, output 2 must also be
assigned. An unused output disables the respective
range evaluation.
Mean value range
1
Analog memory bit
•
Configured as a
floating-point
number:
±3.402823 e-38 ..
±3.38
•
Configured as a
counter:
0 .. 4294967295
Mean value from low limit and high limit of range 1.
5.7.6 Analog value comparator
Function
The values of two analog inputs are compared by forming the difference. If the difference of
two programmable limit values is overshot or undershot, a digital output signal is set.
The difference of "Input 1" minus "Input 2" is monitored for the two limit values "Limit value 1"
and "Limit value 2":
By setting different values for the function parameter (Limit value 1 > Limit value 2) a
hysteresis can be programmed.
In the table note the different behavior when "Limit value 1" is lower or higher than "Limit
value 2".
Parameters
Parameters Tag type / range of
values
Description
Input parameters
En
Enable parameter, see section Often used parameters
(Page 252).
Input 1 Analog input / bit
memory
Event counter / usage
meter
The value of the input is processed as a minuend by the
block function.