Watlow D4T Data Logger
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Chapter 2 Configuration Using Composer
1. Add the function blocks from the library to the canvas that are needed to interpret the
signals from the physical inputs and set the physical outputs. Typically, these will include
Alarm function blocks.
2. Connect the transmitters on the FBs that source data to the receivers on the FBs that
need the data.
3. Set each function block's parameters as needed for the application to perform as expect-
ed.
Detailed descriptions of each function block including all the function block's parameters can
be accessed in the online help for the function block and in the User's Guide, chapter entitled
Function Block Reference.
The FBs that represent the physical inputs and outputs from the data logger and are associ-
ated with the flex modules that are expected in the configuration are always on the canvas.
These FBs can only be removed by changing which modules are expected using the Pluggable
Modules view.
Other FBs can be added to the canvas from the library. See the Application Examples chapter
in this User's Guide for more on these functions. Other function blocks such as Math and Logic
perform fundamental functions that can be combined to add custom behaviors to the data
logger for specific applications.
The signals that carry data between function blocks normally appear as black lines in the dia-
gram, but when the block that transmits the signal cannot determine what the correct value
should be, the signal changes to yellow indicating the error. Each FB's response to errors re-
ceived is explained in the description of the function block.
Warning:
Once an output FB receiver is connected to another block, the output on the flex module
turns on according to the received signal. Do not connect outputs until it is safe to do so
.
Notable facts about the FBD:
• How a FB responds to its inputs and drives its output is dependent on its parameter set-
tings. Set the parameters for each function block as needed for the application.
• Signals cannot be moved after they are created; to change where a signal gets data or
where it delivers it, delete the signal and create the desired connection.
• There are several ways to do many things. Try right-clicking to see options or short
cuts.
• FBs from the library that have no signals connected are returned to the library when
Composer
®
is closed.
• The location of dockable windows is not saved; windows return to their default loca-
tions when the system is closed.
• The selection of signal values displayed in the diagram is not saved; all signal value dis-
plays are turned off when the system is closed.
Hints:
• Click-and-drag any blank spot on the canvas to change the view.
• Use the scroll bars.
