Application
Multi channel input modules may be used in different ways according to application.
Monitoring
Two and four channel modules can provide monitoring and fault detection of each input independently of the other and report status via GPI or Cosmos software as required. The excellent packing density allows multiple signals to be continuously monitored in a compact and cost effective package.
Changeover
On detection of a problem, the onboard changeover relay will switch the through route to the B channel provided this is not reporting errors. To reset the module to the A channel normally requires operator intervention (front of card switch or remote command via Cosmos) to avoid hunting between inputs on intermittent fault detection. The failsafe action of the card and changeover element allows the cards to be used to safeguard the main station output.
Comparator
Channel pairs may be configured to search for differences between signals. When differences exceed a pre-configured profile, an alarm output is triggered. This feature is particularly useful for checking degradation along a signal chain or for ensuring that the transmitted signal is the same as intended. e.g. by comparing a signal direct from the server with that at the MCR output.
Fault Reporting
Errors may be displayed in different ways and combined as necessary. Each module shows its own general status via LED’s on the front edge and reports errors both to GPIs available on each rear connector and a data bus within the frame. GPIs can be routed to customers own annunciator system or a specific alarm panel available from Trilogy. Where more comprehensive monitoring and control is required, we recommend the use of Cosmos software. This offers sophisticated management of multiple signal paths and a choice of alarm warnings including:-
- Pop up window showing detail status of alarmed module
- Simple flashing alarm (click to acknowledge)
- Add to event log
- Send SMS message
- Send email
COSMOS allows all the status information of multiple frames to be interrogated and also allows some remote module configuration. Tabbed menus allow individual alarms to be given a priority rating on a module by module basis.
In addition, alarm events may be masked for specific periods in any day or combination of days. The system could therefore be set, say, to detect black and to log any occurrence of black for more than ‘n’ frames whilst only flagging an alarm during normal transmission hours.
By designing the system configuration carefully, users can avoid misleading alarms arising from events which might be anticipated in a given programme chain, thus ensuring prompt operator intervention when a genuine problem condition is identified.
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