I/O Telemetry systems transmit analog or digital signals and replicate them exactly at another site. For instance, a 4-20mA loop current at the input of the Telemetry system at one site is reproduced as a 4-20mA loop current at the Telemetry system output at the other site.
I/O telemetry can be:
- unidirectional or bidirectional
- point-to-point or point- to-multipoint
- digital, analog or both
- wireline or wireless
Reasons for Using I/O Telemetry:
- remote I/O is required at a local hardware I/O interface
- I/O Telemetry is a more cost effective solution than PLC's and RTU's when the amount of I/O involved is very low.
Below is an illustration of a typical Wireless End-to-End I/O Telemetry system using SCADALink 900-MB's. Here the Telemetry link is bidirectional; inputs/outputs on one side map respectively to outputs/inputs on the other side.
