Related information
8.2.8 User-defined functions
This display allows the user to define eight different functions.
These simple functions trigger one of the remaining digital outputs
(DO).
A user-defined function can be renamed, for example,"Water on
floor".
Each user-defined function is based on two sources, named "1st
source" and "2nd source". See the figure below.
1st source
Second source
Logical operators:
AND, OR, XOR
SR-FF, RS-FF, T-FF
Inverted
(optional)
Minimum hold time
and Maximum hold time
TM046741
User-defined function
The source can be controlled by one of the following:
•
Analog input
•
Digital input
•
Internal CU 362 states
•
Combi alarm
•
User-defined function
•
Timer function
•
Constant value.
It is possible to select a source from all analog and digital inputs on
the CU 362 control unit and the IO 351B and IO 111 modules.
As appears from the figure below, "Timer function" and "Constant
value" are input signals themselves. The signal cannot be inverted
or set on hold by use of the function "Minimum hold time" or
"Maximum hold time". When the input signal has been selected to
be an analog input, a limit must be set for status high (1).
Analog input
Digital input
Internal CU 362 states
Combi alarm
User-defined function
Timer function (alternating between fixed high and low periods)
Constant value (high or low)
Limit (above = high "1")
Inverted
(optional)
Response time
(rising and
falling edge of
input)
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Block diagram of source input
In this display, the user-defined functions can be selected and then
set as desired by the user.
An input signal for each source has to be selected.
Path:
Settings > Advanced functions > User-defined functions
4-2-9_UDF_FUNCTIONS_120
User-defined functions
8.2.8.1 User-defined function
In this display, the user-defined function is selected.
The user-defined functions must be enabled or disabled.
Before the user-defined function becomes active, the input signal of
1st and 2nd sources and a logical operator must be selected.
The output signal of a user-defined function can also be inverted,
and it is possible to set a "Minimum hold time" and a "Maximum
hold time". A hold time is used to hold the output signal for a certain
time (status high/low) in seconds set by the user.
A user-defined function can be used as input signal for
another user-defined function.
Example
"User-def. function 2" is enabled.
"1st source" is set to "All pumps running". "2nd source" is set to
"Timer function". See section about setting up source.
The logical operator is set to "AND" which means that both "1st
source" and "2nd source" have to be high (1) before the output
signal changes status to high (1). The output signal triggers a digital
output (DO). See the two sections about logical operators.
The output signal is not inverted.
"Minimum hold time" is set to 0 second (disabled). "Maximum hold
time" is also disabled.
The function name is set to "My function".
It is possible to go directly to the "Digital inputs" menu and select
the digital output to be controlled by the user-defined function "My
function". See section about digital outputs.
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