NI cRIO-9151 4-slot R Series expansion chassis accepts any CompactRIO I/O module Built-in signal conditioning, isolation, and connectivity for R Series devices Connects to any digital connector of all NI 78xxR R Series plug-in devices Overview The National Instruments cRIO-9151 connects directly to the digital connector on PXI and PCI R Series data acquisition devices and houses up to four CompactRIO I/O modules for high-performance, industrial signal conditioning. A variety of I/O modules are available including 24 V industrial digital I/O with up to 32 channels per module ideal for creating industrial counter/timers, electromechanical relays, ±80 mV thermocouple inputs, ±5 V IEPE accelerometer analog inputs and simultaneous voltage and current analog outputs. Visit ni.com/compactrio for the latest information on module availability. The following list describes how many CompactRIO R Series Expansion Chassis you can connect up to your R Series device, based on how many digital connectors each R Series device contains. NI 7811R – Up to four NI cRIO-9151 R Series Expansion Chassis (16 CompactRIO I/O modules) NI 7813R -- Up to four NI cRIO-9151 R Series Expansion Chassis (16 CompactRIO I/O modules) NI 7830R – One NI cRIO-9151 R Series Expansion Chassis (4 CompactRIO I/O modules) NI 7831R – Up to two NI cRIO-9151 R Series Expansion Chassis (8 CompactRIO I/O modules) NI 7833R – Up to two NI cRIO-9151 R Series Expansion Chassis (8 CompactRIO I/O modules) Data Sheet