Using An Enum Type - Siemens SIMATIC S7 System Manual
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11.3 User-defined web pages
<tr style="height:2%;">
<td>
<p>Power output:</p>
</td>
<td>
<p style="margin-bottom:5px;"> :="Data_block_1".PowerOutput: KW</p>
</td>
</tr>
11.3.8.3
Using an enum type
%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:
Sample HTML code
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;">
<p>Manual override: :="Data_block_1".ManualOverrideEnable:</p>
</td>
The HTML page includes a drop-down select list for the user to change the value of
ManualOverrideEnable. The select list uses the text "Yes" and "No" to display in the select
lists. With the use of the enum type, "Yes" is correlated to the value "On" of the enum type,
and "No" is correlated to the value "Off". The empty selection leaves the value of
ManualOverrideEnable as it is.
514
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
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