Add additional 4 inputs and 2 outputs to your Zelio PLC controller using this extension module. Includes programming.SR3XT61BD Discrete Extension module - Zelio$2,000.00PricePlease specify any special programming requirements?500QuantityAdd to CartPRODUCT INFOPLC Relay Extension Module includes custom programming. RETURN & REFUND POLICYNon Returnable! SHIPPING INFOPlease email to confirm shipping costs. PRODUCT INFO?All SR3 modules and extension modules sold include the programming of the module as per the customers requirements.