The Digital Input-Output System is made up of Master and Slave circuit boards. The Master board can be connected to a maximum of seven Slave boards. Each Master board contains a Timing Module attached to an Input-Output Module, while each Slave board contains only an Input-Output Module.
The Timing Module installed on the standard I/O board makes this board a Master. The other standard boards are Slave boards, which are piggybacked to the Master board with a supplied clock distribution ribbon cable connected from J3 on a Master board to J5 on each of the other Slave boards. See Setup and Installation for more details about board installation.
Typical DIO System