OSAI has developed a proprietary communication bus, to achieve high performance connection between the CNC and other devices such as drives, digital input / output modules, analogue input / output modules and operator consoles. Multidrop configuration consists of a master CNC with a maximum of 63 Slaves, synchronised by a hardware generated clock produced in the CNC. This high performance allows the exchange of a vast quantity of data in real time, thus enhancing the performance of the machine by maximising the advantages in terms of precision and speed.

The digital control of the motion avoids the inaccuracies of a traditional analogue system due to the offset of the analogue components and the noise superimposed on signals. The introduction of commen cables for the axes and I/O brings greatly reduced installation and maintenance costs.

• Date transfer speed : 90 Mbauds.
• 16 bit words read in 1.5 µses
• Each Slave axis is seen by the CNC as a location in memory
• Real-time access of all Slave parameters
• Maximum number of connected devices: 64.
• Input / Output connectors present on each module to simplify installation.
• Automatic configuration of the devices, parameters loading and firmware updates via the Bus

There are two versions of compact I/O, available for the DIN rail. The characteristic are as follows:

Compact I/O Module:
24 x 24VDc inputs
24 x 24VDc outputs @ 300mA
16 x configurable ports (Input or Output)
2 x analogue outputs (12 bit)

Mini Compact I/O Module:
16 x 24VDc inputs
16 x configurable ports (Input or Output)

Characteristics:
3 x analogical outputs (14 bit)
3 x transducer inputs
3 x 24Vdc outputs (for drive enable)
3 x 24Vdc inputs (for drive ready)
1 x fasts “touch probe” input

RIO – (Remote Input Output) is a compact modular system of remote I/O modules available from OSAI for the management and control, through a field bus, of inputs and outputs distributed throughout the plant.
The modular structure of each RIO block guarantees a high degree of flexibility to reduce installation and maintenance costs. In the event of a malfunction, the electronic section of any block can easily be replaced without having to disconnect cables. The status of each input and output on every block is displayed with a LED indicator. External cables are easily connented by inserting wires into simple contact blocks thus avoiding the inconvenience and uncertainty associated with traditional screw terminals.