Serge NOEL
259 lines
17 KiB
Plaintext
259 lines
17 KiB
Plaintext
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<title>JMRI: Set Signals at 3-Way 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 panel">
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<h1>Set Signals at 3-Way Turnout</h1>
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<h2>Introduction</h2>
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<p>In Layout Editor a 3-way turnout is modeled by using two turnouts, usually one right-hand
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and one left-hand, oriented so that the throat of the second turnout is connected to the
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continuing track of the first turnout by a very short Track Segment. This tool provides an
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automated procedure for assigning signal heads and automatically creating signal logic for a
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3-way turnout modeled in this way. This tool can also be used to place signals and set logic
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for two real turnouts that are oriented as described above, where the user does not want to
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put signals between the two turnouts--essentially two real left-handed or right-handed
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turnouts that simulate a real 3-way turnout.</p>
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<p>Six signal heads may be placed around the 3-way turnout as shown below:</p>
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<a href="images/3_WayTurnout.jpg"><img src="images/3_WayTurnout.jpg" width="469" height="180"
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alt="3 way turnout"></a>
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<p>The turnout at the throat, is referred to as <strong>Turnout A</strong> and the other
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turnout is <strong>Turnout B</strong>. Six signal heads are possible--three at the throat,
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indicating the status of the Continuing track (top signal head), Diverging track A (middle
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signal head), and Diverging track B (bottom signal head), and one head at each of the three
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other tracks.</p>
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<p>If requested, this tool will place signal icons on the panel at the six positions shown
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above and will set up control logic for each of the six specified signal heads. In some
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situations, a user may elect to only place one signal head at the throat, resulting in only
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four signal heads around the 3-way turnout. This tool will place the four specified heads,
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and will set up logic for the heads at the Diverging A, Diverging B, and Continuing tracks,
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but it cannot set up logic for the single head at the throat. Instructions on how to do that
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manually, with help from this tool are below.</p>
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<p>Prior to selecting this tool, both turnouts must be on the panel, connected as shown by a
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single track segment, and required signal heads must be in the Signal Head Table. This tool
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places signal heads only when the main track of each turnout is vertical or horizontal (or
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mostly vertical or horizontal) on the panel, so design your panel accordingly. The control
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logic created by this tool only works correctly if each of the three track segments connected
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to the continuing and two diverging legs of the 3-way turnout is assigned to a different
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block, and those blocks are different from the block of the track segment connected to the
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throat of the 3-way turnout. The 3-way turnout (the two turnouts and their connecting short
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track segment) may be in a separate block or in the same block as the track segment connected
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to the throat.</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 six (or four) signal heads to be assigned
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to the 3-way turnout. You may enter both turnout names, or enter only one turnout and allow
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the program to find the other. If you enter only one turnout, make sure you put it in the
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correct position. To check that the second turnout has been found correctly, click the
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<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. <strong>Assigning signal
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heads to turnouts is important to completely describe your layout in Layout Editor.</strong>
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Even if you elect to place your icons and set up your signal logic manually, you should use
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this tool to assign the signal heads to their 3-way turnout.</p>
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<p>After a 3-way turnout is setup using this set up tool, Layout Editor keeps track of the
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fact that Turnout A and Turnout B are linked. So if you select <strong>Set
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Signals...</strong> in the popup menu of either turnout, you will return to this dialog with
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both turnouts filled in. If you should later desire to 'unlink' the two turnouts and add the
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missing signals, for each of the turnouts, select <strong>Set Signals at Turnout...</strong>,
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fill in the turnout name manually, enter signal heads, and click <strong>Done</strong>. After
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this is done for both turnouts, the turnouts will no longer be linked.</p>
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<h3>The Set Signals at 3-Way Turnout Dialog</h3>
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<p>In the <strong>Turnout A Name</strong> and <strong>Turnout B 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 as described above by a single track segment, an error message
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results. The turnout at the throat of the 3-way turnout must be entered as Turnout A, and the
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turnout farthest from the throat must be entered as Turnout B.</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 three signals at the
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throat and one each at the other three tracks. The throat signal heads and the Diverging A
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signal head are placed in Turnout A. The Diverging B and Continuing signal heads are placed
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in Turnout B. The Throat Continuing signal head (green in the above figure) reflects travel
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to the continuing track from the throat track. The other two throat signals reflect travel to
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their respective diverging tracks. If only one throat signal is entered, it should be entered
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in the Throat Continuing position.</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 both previously assigned <strong>Throat
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Diverging</strong> signal heads with blank entries (no signal heads), the previous entries
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are deleted, and there will not be any signal heads at those positions. <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 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. Assigning
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signal heads is also important in completely describing your layout in Layout Editor.</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 where necessary, it creates a Logix that ensures that the turnouts
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are synchronized for the signal. The tool will attempt to setup the logic and automatically
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fill in entries from the information available. If the tool does not have enough information
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available to set up the logic, a message results, and you will have to return later after
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more blocks (with occupancy sensors) and/or signals have been assigned to turnouts and block
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boundaries on the panel. <strong>Note: This tool cannot currently set up logic for a single
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head at the throat of a 3-way turnout. See below for how to do so manually</strong>.</p>
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<h3>Notes</h3>
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<p>This tool will set up Simple Signal Logic in a standardized manner that should cover most
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cases. If the signals do not behave the way you want them to, feel free to edit the Simple
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Signal Logic manually to get the performance you want. To edit the simple signal logic for a
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signal head, in Edit Mode, summon the popup menu of the icon for the signal head whose logic
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is to be edited, and select <strong>Edit Logic...</strong>. Usually addition or removal of a
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sensor, or checking or unchecking an option, is all that is required. In more complicated
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cases, you may need to create a Logix to set the state of an internal sensor, that is then
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added to the Simple Signal Logic.</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 not in the Simple Signal Logic is switched against
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the track the signal head is signaling.</p>
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<p>This tool sets up three-aspect signaling. When a signal head is showing status when moving
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to a diverging route, the tool will set up for limited speed (the least restrictive aspect is
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not green, but yellow), and the signal will show yellow when it otherwise would show green.
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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 a diverging route, but
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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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<h3>Logic for a Single Head at the Throat</h3>
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<p>There are different ways to set up the logic for a single head at the throat of a 3-way
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turnout. The following procedure will work, and is fairly straightforward.</p>
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<ul>
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<li>
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<p>Define three virtual signal heads in the Signal Table, and enter them as the
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<strong>Throat - Continuing</strong>, <strong>Throat - Diverging A</strong>, and
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<strong>Throat - Diverging B</strong> heads, along with the real <strong>Diverging
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A</strong>, <strong>Continuing</strong>, and <strong>Diverging B</strong> signal heads.
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Virtual signal heads are signal heads that are not on the layout--only in the
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computer.</p>
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</li>
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<li>
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<p>Check <strong>Set up Logic</strong> for each of the virtual signal heads, but do not
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check <strong>Add Signal Icon to Panel</strong> for any of these three virtual signal
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heads. Click <strong>Done</strong>. This will set up the logic for the three virtual
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signal heads.</p>
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</li>
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<li>
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<p>Reopen the tool and clear the names of the three virtual signal heads. Place the real
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throat signal head in the <strong>Throat - Continuing</strong> position. Check
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<strong>Add Signal Icon to Panel</strong>, but do not check <strong>Set up Logic</strong>
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for this signal head. Click <strong>Done</strong>. The three virtual turnouts are no
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longer assigned to the 3-way turnout, but they are still in the computer and their logic
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will still function.</p>
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</li>
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<li>
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<p>Set up a Logix to set the appearance of the single real throat signal head based on
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the appearances of the three virtual signal heads. Basically the real signal head should
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be set to the least restrictive of the appearances of the three virtual signal heads.
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This can be accomplished by a Logix with seven Conditionals with increasing numbers of
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simple state variables, set up as follows:</p>
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<ul>
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<li>Conditional 1: if Signal Green IHV1, then Set Signal Appearance IH1 Green</li>
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<li>Conditional 2: if Conditional False C1 AND Signal Green IHV2, then Set Signal
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Appearance IH1 Green</li>
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<li>Conditional 3: if Conditional False C1 AND Conditional False C2 AND Signal Green
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IHV3, then Set Signal Appearance IH1 Green</li>
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<li>Conditional 4: if Conditional False C1 AND Conditional False C2 AND Conditional
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False C3 AND Signal Yellow IHV1, then Set Signal Appearance IH1 Yellow</li>
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<li>Conditional 5: if Conditional False C1 AND Conditional False C2 AND Conditional
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False C3 AND Conditional False C4 AND Signal Yellow IHV2, then Set Signal Appearance
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IH1 Yellow</li>
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<li>Conditional 6: if Conditional False C1 AND Conditional False C2 AND Conditional
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False C3 AND Conditional False C4 AND Conditional False C5 AND Signal Yellow IHV3, then
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Set Signal Appearance IH1 Yellow</li>
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<li>Conditional 7: if Conditional False C1 AND Conditional False C2 AND Conditional
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False C3 AND Conditional False C4 AND Conditional False C5 AND Conditional False C6,
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then Set Signal Appearance IH1 Red</li>
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</ul>
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<p>Where IHV1, IHV2, and IHV3 are the virtual signal heads, IH1 is the real head, and C1,
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C2, ... , C7 are Conditionals 1 through 7. Substitute the actual names of these items
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when you set up your Logix.</p>
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</li>
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</ul>
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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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