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- The message display consists of a four character, 14 segment display which provides intelligent reporting of the sensor status or information on a selected engineering function. For control cards fitted with the high integrity relay outputs performing master, zone or voted alarms, the alarm state will also be indicated as follows:
- BEAM – Beam Blocked Alarm
MSTR – Master Alarm
ZONE – Zoned Alarm
VOTE – Voted Alarm
HONEYWELL 8C-PCNT01｜Single Channel Control｜
- INTRODUCTION The 5701 Series Control System is equipped to provide the operational and engineering facilities necessary to fully maintain a system of gas detection equipment. Each control card within a rack system displays a sensor reading, alarm status and condition of that channel. Further information can be gathered and, depending on the security status, certain settings can be adjusted by means of an Engineering Card fitted to the rack. The relay outputs of the system are configured to provide a range of output alarm functions as follows:.
- Fault Alarm The fault alarm activates when a fault is detected in the control card or associated sensor and is not user configurable. In addition the FAULT LED will be illuminated.
- Inhibit Alarm The inhibit alarm activates when the system alarms are inhibited for any reason and is not user configurable. In addition the INHIBIT LED will be illuminated.
- A1, A2 and A3 Level Alarms The A1, A2 and A3 level alarms are activated when the level of gas being measured crosses the preconfigured alarm threshold. In addition the relevant LED will be illuminated.
- STEL Alarm (Short Term Exposure Limit) The STEL alarm will be activated when the time weighted average concentration of a toxic gas, usually averaged over 10, 15 or 30 minutes, crosses a preconfigured threshold. When active STEL will be shown on the message display of the control card. For certain relay cards and configurations, the alarm LED associated during setup to the STEL alarm will be illuminated.
- LTEL Alarm (Long Term Exposure Limit). The LTEL alarm will be activated when the time weighted average concentration of a toxic gas, usually averaged over 8 hours, crosses a preconfigured threshold. When active LTEL will be shown on the message display of the control card. For certain relay cards and configurations, the alarm LED associated during setup to the LTEL alarm will be illuminated.
- Rate Alarm (Version 2Vx Software only) The rate alarm predicts the future gas concentration by monitoring the rate of rise of the sensor signal and provides an early alarm indication before the sensor signal reaches the next level alarm set point.
- Individual Alarm An individual alarm is caused by the input to an individual control channel crossing a preconfigured threshold and is not related to any other control channel. The relevant LED (A1, A2, A3, Fault, Inhibit) will illuminate on the control card with the alarm condition.
- Zoned Alarm* A zoned alarm is caused by the input to any control channel, from a sensor in a designated area, crossing a preconfigured threshold. The relevant LED (A1, A2, A3, Fault, Inhibit) will illuminate on the control card with the alarm condition and also on the control card designated the Zone Master Card (unless it is fitted with a High Integrity Relay Card).
By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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