DESCRIPTION AND OPERATIONSLAVE EXPANDER BUS2 - 4 I-E96-301B®Switch SettingsThe IMASI03 has one 8-position DIP switch to select the slaveaddress for the slave expander bus. This switch also selectsbuilt-in diagnostics for a stand-alone test.On-Board IndicatorsThe IMASI03 has one red/green LED indicator which showsthe operating status. The LED will:• Flash red on power-up.• Remain off after passing on board diagnostics until theIMASI03 is configured by the MFP.• Show solid green after the master MFP downloads configu-ration data.• Show solid green during normal running.• Blink green when the MFP which configured the IMASI03enters configure mode from execute mode.• Blink green if slave expander bus communication is lost (ifthe MFP is removed).• Show solid red if a fatal failure of the IMASI03 moduleoccurs. For example, if power up diagnostics fail.• Show solid red for a power fail interrupt (PFI).• Show pass/fail of diagnostic routines when in diagnosticmode (refer to Section 6).SLAVE EXPANDER BUSThe INFI 90 slave expander bus is a high speed synchronousparallel bus. It provides a path between MFP master modulesand slave modules. The master module sends control functionsto the IMASI03, and the IMASI03 provides input data to themaster module. The P2 card edge of the IMASI03 and mastermodule connect to the bus.The slave expander bus is 12 parallel signal lines located onthe module mounting unit (MMU) backplane. A 12-positiondipshunt placed in a socket on the MMU backplane connectsthe bus between the master and slave modules. Cable assem-blies can extend the bus to eight MMUs.A master module and its slaves form a subsystem within a Pro-cess Control Unit (PCU). The slave expander bus between mas-ter/slave subsystems must be separated. Leaving a dipshunt
