Data path redundancy is another form of redundancy involving defining data paths between the I/O Server and the connected I/O Devices. By providing a second (parallel) data path, you improve the chances that if one data path to the I/O Device is disconnected, the other can be used.
Most brands of PLCs have the facility to allow you to install a parallel data path from the I/O Server to the I/O Device.
The diagram above shows that an additional data path (running in parallel) has been defined. The redundancy is provided as follows:
On a larger system (such as one running on a network), you can also use data path redundancy to maintain device communications with multiple I/O Server redundancy, as shown in the following diagram.
The redundancy is provided as follows: