IoD1 status input processing node - technical overview

As the status input processing node for the Callisto series of remotes, the IoD1 can multiplex up to 32 status/alarm inputs with one millisecond time-tagged sequence of events recording. A digital filtering algorithm is utilized to maintain time-tagging accuracy during contact bounce conditions. Debounce time is user-definable in multiples of 10 milliseconds with a 10 millisecond default. Two forms of anti-toggle filtering are provided. Under conditions when a user-definable number of "invalid" state changes occur (where the change does not exceed the debounce time) the point is taken out of service. A "chattering" point that produces an excessive number of valid changes within a user-defined period will be disabled, and the condition will be reported to the master station via a user-defined flag.

The attached .pdf document provides technical information on the IoD1 status input processing node:

• general description
• links
• connections
• termination board I/O interface
• LEDs
• board drawings
• technical specifications

Also attached is a general IoD1 overview.

Note: the complete Callisto RTU manual can be found in the knowledge base article entitled "Callisto RTU - technical guide".