IoD1 Digital Processing Module

Integrated status/alarm monitoring and SOE recording

The IoD1 module serves as the digital processing node in the Callisto network and is capable of monitoring up to 32 status/alarm input points, individually configurable for 1 millisecond time-tagged sequence of events (SOE) recording without the need for additional hardware or software. To accommodate additional digital inputs, multiple IoD1 nodes may be combined within a Callisto remote. The IoD1 works in conjunction with digital termination cards, which provide physical connections for input wiring along with signal conditioning and protection. Each termination card has the capacity for eight distinct inputs, which can be configured as pulse accumulator points.

Status events are time-tagged and instantaneously transferred to the Callisto host node (IoE1, Polaris, etc.), where a software application enables extensive SOE recording functions. A digital filtering algorithm is utilized to maintain time-tagging accuracy during contact bounce conditions, with the debounce time being user-definable in multiples of one millisecond with a 16 millisecond default.

Anti-toggle filtering is activated when a user-definable number of invalid state changes occur or when a "chattering"point produces an excessive number of valid changes within a user-defined period. In both cases, the IoD1 can be configured to automatically disable the point and report a flag condition to the master station.

IoD1 Overview

Description: information sheet for the Callisto digital processing module
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