127 lines
7.9 KiB
Plaintext
127 lines
7.9 KiB
Plaintext
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<title>JMRI: Set Signals at Turnout Help</title>
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<meta name="author" content="Dave Duchamp">
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<meta name="keywords" content="JMRI help Layout Editor Tool">
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<h1>Set Signals at Turnout</h1>
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<h2>Introduction</h2>
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<p>This tool provides an automated procedure for assigning signals to a turnout. Right-handed
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turnouts, left-handed turnouts, and wye turnouts are supported. If requested, this tool will
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place signal icons on the panel at the specified turnout, and will set up Simple Signal Logic
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for the specified signal heads. Prior to selecting this tool, the turnout must be on the
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panel, and the required signal heads must be in the Signal Head Table. This tool only places
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signal heads correctly when the main track of the turnout is vertical or horizontal (or
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mostly vertical or horizontal) on the panel, so design your panel accordingly.</p>
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<p>When this item is selected, a dialog is shown for entry of the turnout name (system or
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user), and the names of the three or four signal heads to be assigned to the turnout. For
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each signal head, check boxes are available for selecting whether an icon is to be placed on
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the panel, and whether Simple Signal Logic is to be created for the signal head. Regardless
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of whether icons are placed or logic is created, Layout Editor will record that the entered
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signal heads are assigned to the specified turnout.</p>
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<p><strong>Assigning signal heads to turnouts is important to completely describe your layout
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in Layout Editor.</strong> Even if you elect to place your icons and set up your signal logic
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manually, you should use this tool to assign the signal heads to their turnout.</p>
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<h2>The Set Signals at Turnout Dialog</h2>
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<p>In the <strong>Turnout Name</strong> field, enter the name (system or user) of the turnout
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to which the signal heads will be assigned. If the tool cannot find the entered turnout on
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the panel, an error message results.</p>
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<p>Signal Head names (either system or user) are entered in the next section. The
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<strong>Throat - Diverging</strong> entry is optional, but the other three must be entered.
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If signal heads at this turnout have been entered previously, click <strong>Get
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Saved</strong> to retrieve the signal head names previously entered. The titles used for the
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four signal heads follow the model shown below.</p>
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<p><a href="./images/TurnoutSignalModel.gif"><img src="./images/TurnoutSignalModel.gif"
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width="225" height="75" alt="signals at turnout"></a>
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</p>
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<p>If a signal head is entered for <strong>Throat - Diverging</strong>, then <strong>Throat -
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Continuing</strong> signals the continuing track and <strong>Throat - Diverging</strong>
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signals the diverging track. If no signal head is entered for <strong>Throat -
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Diverging</strong>, the <strong>Throat - Continuing</strong> signal head reflects the state
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of whichever track the turnout is switched to. In that case, the logic type for the
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<strong>Throat - Continuing</strong> signal head is <strong>On Facing-Point
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Turnout</strong>.</p>
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<p>Note: If there was a signal head previously assigned to one of the two positions, and you
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enter a <em>different</em> signal head in the same place, the new signal head will replace
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the previous signal head, and the icon of the previous signal head (if there is one) will be
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deleted from the panel. Similarly, if you replace a previously assigned <strong>Throat -
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Diverging</strong> signal head with a blank entry (no signal head), the previous entry is
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deleted and the turnout will not have a signal head at that position. <strong>If a signal
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head is changed, you must redo any logic that involves it.</strong></p>
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<p>Check <strong>Add Signal Icon to Panel</strong> to request that an icon for a signal head
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be placed on the panel at the turnout position indicated. This tool can only place a signal
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icon on a turnout that is almost vertical or almost horizontal. If this is not so, a message
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is printed, and you should place the signal icon manually using the Layout Editor tool bar.
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Regardless, the signal head name is assigned to the specified turnout position.</p>
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<p>Check <strong>Set up Logic</strong> to request that the tool set up a Simple Signal Logic
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for a signal head. The tool will create the logic and automatically fill in entries from the
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information available. If the tool does not have enough information available to set up the
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logic, a message results, and you will have to return later after more signals have been
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assigned to turnouts and block boundaries on the panel.</p>
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<h2>Notes</h2>
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<p>When setting up logic, this tool will follow track within a block until it finds a signal
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at the end of the block away from the turnout being signaled. If your layout contains
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sections that are signaled and sections that are not, to get this tool to set up logic
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correctly, you may have to place a virtual signal (a signal that does not correspond to an
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actual signal on the layout) at the unsignaled end of the block that connects a section of
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track that is signaled with track that is not signaled. If a block ends with an end bumper,
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no signal is required at the end bumper end.</p>
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<p>If a block has an internal turnout (the turnout, and the track segments at its throat and
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continuing legs are within the block), the program will expect signals at that turnout even
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if it's not at the end of the block. However, at times the user may not want to signal a
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seldom used turnout within a block. When following track through a block, the program will
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skip over unsignaled internal turnouts if <strong>Skip Unsignaled Internal Turnouts</strong>
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is checked in the Layout Editor <strong>Tools</strong> menu. It will always, however, warn
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that it is doing so. <strong>Use this option with caution.</strong> There is no signal
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protecting against a skipped turnout being set incorrectly, so if an unsignaled internal
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turnout is not set correctly, derailed trains could result.</p>
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<p>This tool sets up three-aspect signaling. If the diverging route through the turnout is
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not mainline track, limited speed (the least restrictive is not green, but yellow) is set up.
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If you have a special situation at a signal, you may have to edit the information entered by
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the tool. If you would like four-aspect signaling, you can easily manually edit the logic to
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achieve this. Similarly, by simple hand edits of the logic, you can add approach lighting.
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The Simple Signal Logic dialog can be accessed from the popup menu of the signal icon. If
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your special situation cannot be handled by Simple Signal Logic, you should refer to Logix to
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tailor the signal logic to your needs.</p>
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<p>If you are using two turnouts to represent a double-slip turnout, or if you are using two
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turnouts to represent a three-way turnout, the logic set up by this tool will not work
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correctly. For these two cases, you should use the <strong>Set Signals at Throat-To-Throat
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Turnouts</strong> or the <strong>Set Signals at 3-Way Turnout</strong> tools that are
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available in Layout Editor's <strong>Tools</strong> menu.</p>
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<p><strong>Please remember to save your panel after using this tool.</strong>
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</p>
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