The purpose of the INPMOD module is to administer reading/interpretation of system and environmental data. The following data groups are included:

An INPMOD run may consist of a combination of the data groups, but a data group included must be complete. Data group A is mandatory, while data groups B-E normally will be given. All data groups except data group A can be given more than once. Note that running INPMOD always overwrites old information in the INPFIL. That means that all needed data on INPFIL must be generated in one INPMOD run.

Within each group, the first two data groups (identification and control data) must be given first, while the order of the remaining data groups, to some extent, is arbitrary. Data groups in one section cannot be mixed with data groups in another section. This means that when the program finds a data group identifier it will only check the data within the current section. If one or more errors are found, an error message is written and an error flag is written to the INPFIL file. A run with STAMOD or DYNMOD using this file will then be terminated. INPMOD will continue to read data until the END input line is found (see Termination of input data) regardless of the number of errors detected.