The ELC modular controllers are less than half the size of most programmable logic controllers. ELC digital I/O expansion modules provide the correct amount and type of I/O for application solutions. Choose 4, 8 or 16 I/O with different combinations of AC and DC input and relay and transistor output. Any number of expansion modules can be added to an ELC controller to create up to 256 I/O. Specialty modules like analog in, analog OUT and platinum temperature are also available.