End-to-End I/O Telemetry is used when a small amount of I/O needs to be replicated at another site. Although PLC’s or RTU’s can be used for this, it is usually more cost-effective to use I/O Telemetry technology which is designed specifically to handle a small amount of I/O.
Because wireless End-to-End I/O telemetry has traditionally relied on licensed or unlicensed radio technology it’s range has been limited to line-of-sight. However, IP-based communications leveraging the extensive coverage of cellular networks removes this constraint. Cellular networks may be used in applications where the line of sight between sites are restricted due to terrain or foiliage or in situations where towers may be deemed unsightly. In some these applications lease lines replacement may be necessary due to lease line failure.
The RIO100 or DC100 configured with the I/O cellular telemetry option is an example of such a technology. Using the RIO-100 with the End-to-End cellular telemetry option, one could have multiple telemetry links concurrently operating over the entire cellular network.
Conceivably, a network with extensive coverage could enable inputs/outputs on one side of the link to be replicated thousands of miles away on the other side of the link.
With the RIO100, each RIO has the following I/O mapping in this mode: 4 DI, 4 DO, 4 AI & 4 AO. The End-to-End I/O mapping between two RIO100 terminals is:
- 4 DI to 4 DO
- 4 DO to 4 DI
- 4 AI to 4 AO
- 4 AO to 4 AI
Digital inputs can be replicated as digital outputs on the other side of the link. The RIO100 is designed to enable I/O telemetry over cellular networks by reducing data rates by transmitting change of state.
The diagram below shows how multiple RIO100 End-to-End I/O Telemetry links from the same client, can concurrently operate on the same cellular network. All that’s required to specify an End-to-End link is to configure each terminal with the matching terminal’s IP address.