SCOM-100, User guide 73
9.7 Setting an I/O expansion module address
9.7.1 GE-DIO-42 digital I/O expansion
Module number 0 is reserved for the main unit.
The module number (m, see sections 4.3 & 4.4) of an
expansion module is determined by the DIP switch
settings on the rear side of the module. The settings can
be derived from the following table: