Using SC type Fixed time

The SC type Fixed time allows you to define fixed time signal controllers. To edit the signal plan, you use the graphical SC editor. Depending on the Vissim license, you have add-on functions in the SC editor with Vissig, which deviate from the standard version of Vissim (Opening and using the SC Editor).

Vissig determines the current cycle second for a fixed cycle time

In Vissim, the first cycle starts at 00:00:00. At the simulation start, the cycle second is calculated based on this start time.
If the start time (time of day) specified in the simulation parameters is 00:00:00, the cycle and simulation start at the same time.
If the start time (time of day) specified in the simulation parameters is not 00:00:00, at the simulation start, the current cycle second may have a value other than 0, as the first cycle was started at 00:00:00.

1. From the Signal Control menu, choose > Signal Controllers.

The Signal Controllers list opens.

2. Right-click the entry of your choice.

3. From the shortcut menu, choose Edit.

The Signal Controller window opens.

4. In the Type field, select > Fixed time.

Note:

The Cycle time section is not enabled. You cannot edit the base attributes Cycle time and Offset in the Signal controller window. To change these attributes, click the Edit Signal Control button. Then in the navigator, select Signal programs. In the table, you can edit Cycle time, Offset, and Switch point (Opening and using the SC Editor).
The current cycle second (determined by Vissim for a fixed cycle time) is calculated based on the start of the first cycle at midnight. It makes no difference if 00:00:00 is set as the start time (time of day).

5. Open the Controller configuration tab.

6. Make the desired changes:

Element

Description

VISSIG supply file

Signal control file *.sig in XML format.

Notes:

When importing older Vissim network files, the files *.sig are automatically created and stored in the directory in which the network file *.inpx is stored.
When you duplicate a SC, the original SC and the duplicate both use the same signal control file *.sig. This means the changes you make to a SC affect all SCs that use the same signal control file *.sig.

Program no.

ProgNo.: The signal program or daily program list that you want to simulate ( Defining and editing daily program lists). A change of program is possible if the simulation run is in single-step mode. If the new signal program number is confirmed with OK, the changeover is triggered in the next simulation second.

Edit Signal Control button

The signal program editor opens (Opening and using the SC Editor). The signal groups must be created or deleted in the SC Editor. Changes in the channel number of existing signal groups are detected in Vissim and adjusted accordingly in the corresponding signal heads.

Note: The SC frequency is loaded from the external data of the controller.

Internally, the SC frequency is the smallest integer multiple of all SC frequencies. The value may not exceed 10 because Vissim allows a maximum of ten simulation steps per second.

The control procedure additionally uses the following files:

Element

Description

Program file

ProgFile: File with control logic, VISSIG_controller.dll by default

Dialog DLL file

GUIFile: File name of supply interface, VISSIG_GUI.DLL by default

Supply file 1

SupplyFile1: Configuration file, vissig.config by default.

Note: If the supply files are stored in the Exe directory of your Vissim installation, they are automatically loaded.

WTT files

WTTFile: Value type tables: Contain the data types of the control logic and the type of display in the SC detector record or in the Signal times table window. VISSIG.wtt by default.

Superordinate topic:

Using signal control procedures

Information on editing:

Defining SC and signal control procedures

Changing control procedures for SC type

Showing licensed signal control procedures

Performing green time optimization of stage-based fixed time controllers