This page contains information about VFD-C input/output expansion fees, 4 discrete wx., 2 discrete out. ( EMC-D42A ) with a detailed description of the technical characteristics . You can download documentation for EMC-D42A, series option from manufacturer Delta Electronics . Buy EMCD42A and seek technical advice. Our Engineers will help you choose and buy EMC-D42A only high quality at affordable prices. Guarantee. EMC-D42A