VDU - VISUAL DISPLAY UNIT Railway Signal Control
VDU WITH CCIP
(VISUAL DISPLAY UNIT WITH CONVENTIONAL CONTROL & INDICATION PANEL)
VDU ( Visual Display Unit)
In this type, SM has the option to operate the Points and Signals through the conventional “Control PANEL” or through “VDU”.
VDU is the exact replica of the conventional panel. Hence it can act as an alternative to the control panel operation.
VDU consists of a display unit, key board and pointing device (mouse).
When the VDU is ON, the complete yard with all its knobs, buttons, indications, etc. are displayed on the screen.
It can be used to carry out all the operations as can be done through CCIP in a very simple manner by clicking the mouse.
Only one mode – either VDU or Conventional PANEL – should be operated at a time.
SM can choose the mode of operation at any given time as per his requirement.
Normally, the operations are to be done through the VDU mode.
In case of any problem or requirement, this can be transferred to conventional Control PANEL mode manually and this transfer is done automatically during failure of VDU.
Along with PC software, On Screen Key Board utility is provided to enter the Username and Password. This keyboard is similar to physical keyboard.
Point control operation in VDU
As the Electronic Interlocking System provided at stations is route setting type, the Points are set to the required position automatically when a command for clearing a Signal is issued.
In order to set the Points through route setting, the Point knob shall be in the centre position.
It is also possible to operate the Point individually, if required.
To operate the Point to the required position (Normal/Reverse), click the concerned Point Knob.
A dialog box appears.
Click the required position either Normal or Reverse in the dialog box.
The knob position will turn to the selected position (Normal/Reverse).
The Point will be set to the selected position and the indication will appear in the position concerned.
Signal control operation in VDU
✓ To clear the Signal and set the route (Main/Shunt/Calling On)
Ensure that all the Point Knobs in the centre position.
Click the concerned Signal knob.
A dialog box appears.
Click the required position (Reverse) in the dialog box.
The knob position will turn to the selected position (Reverse).
Click the concerned Route Button.
A dialog box appears.
Click the required option (Press) in the dialog box.
Signal gets cleared. Route indicator if provided will get lit, when the route is initiated for the loop line.
Route set indication will be lit in the entire route.
✓ To cancel the cleared Signal (Main/Shunt/Calling On)
Click the concerned Signal knob.
A dialog box appears.
Click the required position (Normal) in the dialog box.
The knob position will turn to the selected position (Normal).
The concerned Signal will assume ON aspect.
The concerned route indication for the initiated route disappears in Absolute Block system after a time lapse of 120 seconds for Home Signal.
In case of Starter Signal and Subsidiary Signal where Approach Track Circuits are provided and if there is no train in the approach route, the initiated route disappears immediately.
In case of a train in the approach route, the initiated route disappears after a time lapse of 60 seconds.
If there are no Approach Track Circuits for Starter Signal and Subsidiary Signal the initiated route disappears after a time lapse of 60 seconds.
The relevant cancellation counter will register the next higher number.
DUAL VDU
In this system, an additional VDU is provided as Standby arrangement.
Both the VDUs will be in the connected mode and will display the station yard arrangement.
Normally one VDU will be in the active mode.
Controlling and operation of signalling functions will be possible through active mode VDU.
During failure of active VDU, control of all the signalling functions, will automatically change over from active VDU to other (standby) VDU.
Operation from other VDU is possible only after following the prescribed procure for enabling the VDU.
For enabling the functions from VDU, duty SM shall click on the icon provided in the VDU.
SM shall enter Username and Password and Click OK button.
Indications are provided on VDU to indicate the VDU is activated.
SM can carry out all further operations from the selected VDU.
Detailed procedures shall be given in the SWR.
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