Serge NOEL
177 lines
12 KiB
Plaintext
177 lines
12 KiB
Plaintext
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<title>JMRI: Set Signals at Throat-to-Throat Turnouts Help</title>
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<meta name="author" content="Dave Duchamp">
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<meta name="keywords" content="JMRI help Layout Editor panel">
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<h1>Set Signals at Throat-to-Throat Turnouts</h1>
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<h2>Introduction</h2>
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<p>This tool provides an automated procedure for assigning signals to two turnouts in close
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proximity oriented throat-to-throat, with the throats connected by a single track segment.
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This arrangement is used where four tracks come together in a small area, so closely that no
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signals are placed at the turnout throats. Such a setup is used to model a double-slip
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turnout, for example, but can also occur in other contexts. Each of the two turnouts may be
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either right-hand (RH), left hand (LH) or wye (WYE) turnouts. Schematically, the final
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throat-to-throat setup looks as shown below:</p>
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<a href="./images/TToTTurnout8.gif"><img src="./images/TToTTurnout8.gif" width="280" height=
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"75" alt="set thoat to thoat signals"></a>
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<p>If requested, this tool will place signal icons on the panel at the continuing and
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diverging legs of the two turnouts, and will set up control logic for specified signal heads.
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Either one or two signal heads may be placed at each leg of the turnouts. The continuing leg
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is the track connected when the turnout is "CLOSED", and the diverging leg is the track
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connected when the turnout is "THROWN".</p>
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<p>Prior to selecting this tool, both turnouts must be on the panel connected
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throat-to-throat by a single track segment, and required signal heads must be in the Signal
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Head Table. This tool places signal heads only when the main track of the turnouts is
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vertical or horizontal (or mostly vertical or horizontal) on the panel, so design your panel
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accordingly. The control logic created by this tool only works correctly if each of the track
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segments connected to the continuing and diverging legs of the two turnouts is assigned to a
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different block. It works best if the track segment connecting the two throats and the two
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turnouts are in a fifth different block, but this is not required.</p>
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<p>When this item is selected, a dialog is shown for entry of the names (system or user) of
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the two turnouts, and the names (system or user) of four to eight signal heads to be assigned
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to the two turnouts. You may enter both turnout names, or enter only one turnout and allow
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the program to find the other. To check that the second turnout has been found correctly,
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click the <strong>Get Saved</strong> button.</p>
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<p>For each signal head, check boxes are available for selecting whether an icon is to be
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placed on the panel, and whether control logic is to be created for the signal head.
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Regardless of whether icons are placed or logic is created, Layout Editor will record that
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the entered signal heads are assigned to the specified turnouts.</p>
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<p>When two turnouts are setup using this throat-to-throat set up tool, Layout Editor keeps
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track of that fact. So if you select <strong>Set Signals...</strong> in the popup menu of
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either turnout, you will return to this dialog with both turnouts filled in. If you should
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later desire to 'unlink' the two turnouts and add signals at their throats, for each of the
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turnouts, select <strong>Set Signals at Turnout...</strong>, fill in the turnout name
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manually, enter signal heads, and click <strong>Done</strong>.</p>
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<h3>The Set Signals at Throat-to-Throat Turnouts Dialog</h3>
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<p>In the <strong>Turnout 1 Name</strong> and <strong>Turnout 2 Name</strong> field, enter
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the name (system or user) of one or two of the turnouts. If only one is entered, the tool
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will find the other when the <strong>Done</strong> or <strong>Get Saved</strong> buttons are
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clicked. If the tool cannot find the second turnout, or if the two entered turnouts are not
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on the panel or not connected throat-to-throat by a single track segment, an error message
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results. It makes no difference which turnout you call <strong>Turnout 1</strong> and which
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you call <strong>Turnout 2</strong>.</p>
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<p>Signal Head names (either system or user) are entered in the next section. If signal heads
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at these turnouts have been entered previously, click <strong>Get Saved</strong> to retrieve
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the signal head names previously entered. The tool provides for entry of two signals at each
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of the continuing and diverging tracks of each turnout (as shown in the figure above). These
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signal heads show the status for moving to the continuing or diverging tracks of the other
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turnout. First the signal heads located at <strong>Turnout 1 - continuing track</strong> are
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entered. The <strong>continuing track</strong> signal head is required, but the
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<strong>diverging track</strong> entry is optional. If only the <strong>continuing
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track</strong> signal head is entered, the tool assumes that head is signaling both tracks of
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the other turnout, similar to when only one signal head is placed at the throat of a single
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turnout.</p>
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<p>Next the signal heads located at <strong>Turnout 1 - diverging track</strong> are entered.
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Remember this is the turnout 1 leg that is connected when the turnout is set THROWN. When two
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heads are entered, the head closest to the points signals the status of the continuing track
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(the turnout CLOSED track) of the other turnout. Similarly, the signal heads located at
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<strong>Turnout 2 - continuing track</strong> and <strong>Turnout 2 - diverging
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track</strong> are entered.</p>
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<p>If there was a signal head previously assigned to any position, and you enter a
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<em>different</em> signal head in the same place, the new signal head will replace the
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previous signal head, and the icon of the previous signal head (if there was one) will be
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deleted from the panel. Similarly, if you replace a previously assigned
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<strong>Diverging</strong> signal head with a blank entry (no signal head), the previous
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entry is deleted, and there will not be any 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> In particular, if you
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delete a diverging signal head, you must redo the logic for the continuing signal head
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located on the same track.</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 turnouts that are 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. This
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assignment is important for setting up logic for other signals down the track.</p>
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<p>Check <strong>Set up Logic</strong> to request that the tool set up signal control logic
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for a signal head. For each of these signal heads, the tool creates a Simple Signal Logic for
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that head, and in addition creates a Logix that ensures that the turnout the signal is placed
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on is not thrown against the leg the signal is placed on. The tool will attempt to setup the
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logic and automatically fill in entries from the information available. If the tool does not
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have enough information available to set up the logic, a message results, and you will have
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to return later after more blocks (with occupancy sensors) and/or signals have been assigned
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to turnouts and block boundaries on the panel.</p>
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<h3>Notes</h3>
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<p>The tool will set up the Simple Signal Logic to set all signals red if the block
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containing the two turnouts and their connector track is occupied. If this is not what you
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want, you should edit the Simple Signal Logic by removing the occupancy sensor of that
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block.</p>
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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 create and assign a virtual signal (a signal that does not
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correspond to an actual signal on the layout) at the unsignaled end of the block that
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connects track that is signaled with track that is not signaled. (You do not need to add an
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icon for the virtual signal to your panel, but it must exist in your signal head table, and
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must be assigned to a turnout or block boundary using a Set Signals ... tool.) If a block
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ends with an end bumper, no virtual 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>When setting up the Logix used in the control logic, the tool creates an internal sensor
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to communicate with the Simple Signal Logic. The Logix will appear in your Logix table, and
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the internal sensor will appear in your sensor table. The system names of the Logix and
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internal sensor will be, IX or IS followed by TTT_X_HHH, where TTT is the system name of the
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turnout where the signal head is located, X is either C or T depending on whether the signal
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head is located on the continuing (CLOSED) track or the diverging (THROWN) track, and HHH is
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the system name of the signal head. The purpose of this Logix is to ensure that the aspect of
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the signal head will be red if the turnout where the signal head is located is switched
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against the track the signal is on.</p>
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<p>This tool sets up three-aspect signaling. When a signal head is showing the status when
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moving to a diverging route, the tool will set up for limited speed (the least restrictive
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aspect is not green, but yellow), and the signal will show yellow when it otherwise would
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show green. You can change this with a simple edit (see below).</p>
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<p>If you have a special situation at a signal, you may have to edit the information entered
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by this tool into the Simple Signal Logic. If you would like four-aspect signaling, you can
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easily manually edit the logic to achieve this. Similarly, by simple hand edits of the logic,
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you can add approach lighting. If you don't want yellow when moving to the diverging route,
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but prefer green, open the Simple Signal Logic for the head you want to change and uncheck
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<strong>Limited Speed</strong>. The Simple Signal Logic dialog can be accessed from the popup
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menu of each signal icon. If your special situation cannot be handled by Simple Signal Logic,
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you should refer to Logix to tailor the signal logic to your needs.</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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