Thesis - Leigh Moody.pdf - Bad Request - Cranfield University

Chapter 8 / Simulation
_ _
8.5.1 Global Common Block Consistency Checking
Stand-alone software has been developed to check the GCB code segment.
The software checks for consistency, multiple mappings to a single common
block variable, multiple use of common block locations, and text alignment.
The latter is important as the text is read and decomposed by the simulation
for automated printing, graphics, and windows interface presentation, where
field widths are critical. The program is stored in CMS group [SUPPORT]
and comprises two source modules and a DEC DCL command file:
COMMON_CHECKER.FOR
CB_SORT.FOR
COMMON_CHECKER.COM
The command file builds an executable image directly from the CMS
library, assigns the common block file to input channel 10, runs the image,
and deletes both the image and all files used to build the program. Three
ASCII data files are produced:
FOR016.DAT
A data file produced in response to variables failing the tests.
FOR017.DAT
List of variable names, units, and scaling factors ordered by their position in
the GCB real and integer vectors (their ID number).
ORDERED_COMMON_BLOCK.DAT
List of variable names, location, units and definition ordered alphabetically.
Similar consistency checks are carried out during simulation initialisation.
If errors are detected at this stage the program is terminated by setting
ISTOP to 1, with a diagnostic message written to the Data Logging file
described later.
8.6 Simulation Infrastructure Control
SIMULATOR controls the program infrastructure invoking DF_CONTROL
that in turn controls the loading of pre-set default data, as shown in Figure
8-6. The stored information is sufficient to run the program in conjunction
with control data provided by the user. The data is loaded ignoring later
restrictions imposed on program functionality by the user, and includes:
• I/O data channel identifiers
• Threshold for comparing real values
• Integration order set to 2, and the integration state range [1(1)28]
• Initial value of in-run real and integer common block change indices
• Number of lines per page to the Data Logging file
• Commonly used constants and unit conversions
8-9