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display fields and to write values to the PLC (Page 524) for data coming from user input.
This page also uses AWP commands for enum type definition (Page 529) and reference
(Page 530) for handling ON/OFF settings.
The first part of the page displays a header line that includes the wind turbine number and
the location. The next part of the page displays atmospheric
conditions at the wind turbine. These fields are
supplied from I/O at the turbine site that provide
the wind speed, wind direction, and current
temperature.
Next, the page displays the power output of the
turbine as read from the . The following sections allow for manual control of the turbine, overriding the normal
automatic control by the . These types are as follows:
 Manual override: enables manual override
of the turbine. The STEP 7 user program
requires that the manual override setting be
true before enabling the use of any of the
manual settings for turbine speed, or yaw or
pitch.
 Yaw override: enables manual override of
the yaw setting, and a manual setting for the
yaw. The STEP 7 user program requires
that both manual override and yaw override
be true in order to apply the yaw setting.
 Pitch override: enables manual override of
the pitch of the blades. The STEP 7 user
program requires that both manual override
and pitch override be true in order to apply
the blade pitch setting.
The HTML page includes a submit button to
post the override settings to the controller.
The braking user input field provides a manual
setting for a braking percentage. The STEP 7
user program does not require manual override
to accept a braking value.
In addition, the HTML page uses an AWP command to write the special variable (Page 527)
that contains the user ID of the user that is accessing the page to a tag in the PLC tag table.The "Remote Wind Turbine Monitor" HTML page uses numerous AWP commands for
reading data from the controller (Page 523) and displaying it on the page. For example,
consider the HTML code for displaying the power output as shown in this portion of the
example pageThe following excerpt from the "Remote Wind Turbine Monitor" HTML page displays the text
"Power Output:" in the left cell of a table row and reads the variable for the power output and
displays it in the right cell of the table row along with the text for the units, KW.
The AWP command :="Data_block_1".PowerOutput: performs the read operation. Note that
data blocks are referenced by name, not by data block number (that is, "Data_block_1" and
not "DB1"). %The "Remote Wind Turbine Monitor" HTML page uses enum types for the three instances
where HTML page displays "ON" or "OFF" for a Boolean value, and for where the user sets
a Boolean value. The enum type for "ON" results in a value of 1, and the enum type for
"OFF" results in a value of 0. For example, consider the HTML code for reading and writing
the Manual Override Enable setting in "Data_block_1".ManualOverrideEnable value using an
enum type: The following excerpts from the "Remote Wind Turbine Monitor" HTML page show how to
declare an enum type called "OverrideStatus" with values of "Off" and "On" for 0 and 1, and
then setting an enum type reference to OverrideStatus for the ManualOverrideEnable
Boolean tag in the data block named "Data_block_1". Note that for each AWP_Enum_Ref
declaration there must be a corresponding AWP_In_Variable declaration for the data block
tag or PLC variable if the HTML page writes to the variable through an enum type.
<!-- AWP_In_Variable Name='"Data_block_1".ManualOverrideEnable' -->
<!-- AWP_Enum_Def Name="OverrideStatus" Values='0:"Off",1:"On"' -->
<!-- AWP_Enum_Ref Name='"Data_block_1".ManualOverrideEnable'
Enum="OverrideStatus" -->
Where the HTML page includes a display field in a table cell for the current state of
ManualOverrideEnable. It uses just a normal read variable command, but with the use of the
previously declared and referenced enum type, the page displays "Off" or "On" rather than 0
or 1.
<td style="width:24%; border-top-style: Solid; border-top-width:
2px; border-top-color: #ffffff;">