The 4000 family of controllers offers a variety of processors and interface modules for general-purpose industrial control. Card racks are available for mounting five, 10, or 20 modules. In addition to the basic processor, there are modules to satisfy a variety of analog, discrete, serial, and transducer interface requirements. Control Racks : • 4000 Logic Control Rack ( LCR) Central Processing Units : • 4100 Central Processing Unit ( CPU) • 4110 Central Processing Unit ( CPU) • 4120 Central Processing Unit ( CPU) Real-Time Clock Modules : • 4200 Real-Time Clock ( RTC) Communication Interfaces : • 4300 Serial Data Interface ( SDI) • 4310 Fiber-Optic Star ( FOS) • 4320 Remote I/ O Node Adapter ( RIO) • 4330 Modbus® Plus Interface ( MPI) • 4340 ControlNet Interface ( CNI) • 4350 Profibus Interface ( PBI) • 4360 Ethernet Interface ( ENI) Input/ Output Interfaces : • 4400 Parallel Input/ Output Interface ( PIO) • 4450 Converter Input/ Ouput Interface ( CIO) Feedback Interfaces : • 4510 Incremental Encoder Interface ( IEI) • 4520 Resolver Interface ( RES) • 4530 Universal Absolute Encoder Interface ( UAE) • 4540 Serial Absolute Encoder Interface ( SAE) Analog Interfaces : • 4600 Analog-to-Digital Converter ( ADC) • 4650 Digital-to-Analog Converter ( DAC) Power Supplies : • 4800 Logic Supply Unit ( LSU)