The HMI Digital, Analog Extension board ETD1644, can be mounted on the back of a TD410 HMI. Up to two ETD1644's, can be installed on the TD710, TD810, and TD820. Each ETD1644 has four universal analog inputs that can accept 4-20 mA, Voltage, RTD's and Thermocouples. It also has four isolated 4-20 mA or 0-10V outputs. The ETD1644 also has 16 digital IO, which can be either inputs or outputs 16 Solid State relays. Mounting the ETD1644 on to the back of the TD410 HMI makes a compelling economical HMI/IO solution.