Viu Configuration; Viu Operating States; Configuration Verification At Startup - Siemens VIU-20 Installation And Instruction

BASIC VIU OPERATION
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3.3

VIU CONFIGURATION

The VIU must be configured for the local installation. Vital configuration parameters are entered
using the PC-based DT software while non-vital configuration parameters are entered through
the VIU web browser interface. These configuration parameters and the method of configuration
are discussed in Sections 6 & 7 of this manual.
3.4

VIU OPERATING STATES

The VIU operating states consist of the following:
• Initial State: This is the VIU initial power-up state during which the VIU performs its power-up
self test routine to validate the hardware, Executive software, Module Configuration File
(MCF) and corresponding MCF CRC, and the vital configuration using the Unique Check
Number (UCN). Once the power-up self-test has been successfully completed, the unit will
transition to an Un-configured State if there is a problem with the configuration such as one
of the following:
MCF CRC is incorrect
•
• UCN is incorrect
ATCS address for VIU is not set correctly
•
• VIU resets to default values
If each of the configuration items listed above passes validation, the VIU will transition to the
•
Fully Operational state.
Un-Configured State: In this state the VIU is installed but not configured correctly. It will
•
successfully complete its power-up self tests but will not send out any vital messages or
respond to any vital messages. It will respond, however, to input from the front panel
keypad, messages from the VIU web browser interface and to messages from the
Diagnostic Terminal (DT) program to allow for local configuration of operating parameters.
Fully Operational State: In this state, the VIU vital parameters are configured in accordance
•
with the office plan.
Shutdown State: In this state, the VIU is not receiving or transmitting vital messages.
•
3.5

CONFIGURATION VERIFICATION AT STARTUP

SIG-00-07-11
Version No.: B.2
VERIFY THAT VIU IS PROGRAMMED AS SPECIFIED BY THE
RAILROAD'S OR AGENCY'S WITH THE CORRECT MCFCRC,
UCN, ATCS SITE IDENTIFICATION NUMBER (SIN). FAILURE TO
DO SO MAY LEAD TO INCORRECT OR UNSAFE INDICATIONS
ON THE VIU UNIT.
USER CONFIGURABLE ITEMS ARE UCN PROTECTED TO
PROHIBIT UNAUTHORIZED CHANGES.
When vital configuration changes are made in the MCF, a new UCN
must be calculated and entered into the VIU to validate the changes.
The UCN is calculated using a special version of the DT software
(see Section 4).
WARNING
NOTE
3-6
SEPTEMBER 2012 (REVISED OCTOBER 2019)