To configure a Symax I/O module under Unity you first have to configure an RIO drop which then contains your I/O modules. The following description gives you step by step instructions on how to implement and configure Symax I/O modules into a Quantum system working with Unity. 800 series I/O modules follow a system of flat address mapping in Unity Pro. To work properly. each module requires a determinate number of bits and/or words. The IECaddressing system is equivalent to the 984LL register addressing.