5C500.21
The 5C500.21 bus unit by B & R Automation is part of the 5CS Provit Controller System Units. It offers one B&R ISA and one half-size ISA/PCI combo slot, operating on 100-240 VAC with a DC supply of 18-30VDC. Enhanced features include CD-ROM drive support for models 5A5009. 01 and 9A5009. 02, a 33 MHz clock frequency, and 40 mm fans. It functions within -10 to +50 degrees C and withstands up to 90% humidity.