Appendix A. Performance Data280 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222ADA-3.4 I/O Scan and I/O Fault Sweep ImpactThe I/O scan sweep impact has two parts, Local I/O and Genius I/O. The equation for computing I/O scansweep impact is:= + Genius I/O ScanImpactI/O Scan Sweep Impact Local Scan ImpactSweep Impact of Local I/O ModulesThe I/O scan of I/O modules is impacted as much by location and reference address of a module as it isby the number of modules. The I/O scan has several basic parts.I/O Scan DescriptionRack Setup Time Each expansion rack is selected separately because of the addressing ofexpansion racks on the VME bus. This results in a fixed overhead perexpansion rack, regardless of the number of modules in that rack.Per Module Setup Time Each Local I/O module has a fixed setup scan time.Byte Transfer Time The actual transfer of bytes is much faster for modules located in the mainrack than for those in expansion racks. The byte transfer time differences willbe accounted for by using different times for I/O modules in the main rackversus expansion racks.In addition, analog input expander modules (the same as Genius blocks) have the ability to be groupedinto a single transfer as long as consecutive reference addresses are used for modules that haveconsecutive slot addresses. Each sequence of consecutively addressed modules is called a scan segment.There is a time penalty for each additional scan segment.RX7i I/O Module TypesType Part NumbersDiscrete Input Type I(16-point, 14-point)IC697MDL240, IC697MDL241, IC697MDL251, IC697MDL640,IC697MDL671Discrete Input Type II(32-point)IC697MDL250, IC697MDL252, IC697MDL253, IC697MDL254,IC697MDL651, IC697MDL652, IC697MDL653, IC697MDL650,IC697MDL654Discrete Output Type I(16-point, 12-point)IC697MDL340, IC697MDL341, IC697MDL740, IC697MDL940Discrete Output Type II(32-point)IC697MDL350, IC697MDL750, IC697MDL752, IC697MDL753Analog Input Type I(8-Channel)IC697ALG230Analog Input Type II(16-Channel with 8-channel AImodule)IC697ALG440, IC697ALG441Analog Output(4-channel)IC697ALG320
