Honeywell H-S81-HS Manual

Also see for H-S81-HS: Operation manual

Contents

Honeywell H-S81-HS Manual Manual pdf 15 page image

15 Safety Bus Manual — P/N LS10177-000HI-E:B 02/21/2019Introduction Safety Bus Protocol Technical Specifications2.6.2 Short Circuit IsolatorsThe control cards and modules of the Safety Bus system are provided with short circuit isolators onboth communication links. A short circuit on a link is signaled both locally (on the modules) and onthe control panel. The short circuit isolator have the following electric characteristics:2.6.3 Response TimeThe I/O modules must promptly communicate alarms, anomalies and the analog values of the con-trol boards. The time it takes the input module to communicate an alarm to the panel depends onvarious factors, including:• The number of modules on the communication ring• The physical position of the module on the communication ring• Whether or not there is a failure along the communication ring• The quality of communication along the ringIn any case, in the most unfavorable operating conditions (64-module loop, with a failure along thecommunication ring) the system guarantees alarm signaling within one second and therefore con-siderably less than required by UL standards. The other types of signals having a lower prioritylevel are received by the panel with the same delay in conditions of no traffic and slightly delayedin case of other events having a higher priority on the ring. The table below shows some Safety Busresponse times at maximum configuration (64 I/O modules with two control boards):NOTE: As the system is able to support a single failure along the communication ring, it isimportant to diagnose and repair failures as soon as they are signaled by the panel, in order toguarantee correct system operation without degrading the security level.Parameter Description ValueIL max Max leak current with open switch 10 mA ACRF Operating resistance 10 - 10.5 ΩRF Reset resistance 11.5 - 12 ΩISO max Max operating current 7 mA ACISO min Min operating current 5.5 mA ACISC max Max reset current 5.3 mA ACISC min Min reset current 5 mA ACFigure 2.7 Electric Characteristics of Short Circuit IsolatorsSequence Typical TimeAlarm received by the panel coming from an input module with no failures along thecommunication ring100 millisecondsAlarm received by the panel coming from an input module with one failure along thecommunication ring200 millisecondsOutput module activation following an alarm coming from an input module with nofailures along the communication ring200 millisecondsOutput module activation following an alarm coming from an input module with onefailure along the communication ring400 millisecondsFigure 2.8 Ring Response Time