Pool Boiler Temperature Controller: Difference between revisions
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|DigAlarm2 | |DigAlarm2 | ||
|Triggers a manually-latched alarm per a rising edge on <b>Lgc2 1</b>. The alarm remains active until acknowledged. | |Triggers a manually-latched alarm per a rising edge on <b>Lgc2 1</b>. The alarm remains active until acknowledged. | ||
|- | |||
|Instrument | |||
|Provides access to the OP1 and OP2 "beacons" (display indicators) for OP1 and OP2. | |||
|- | |- | ||
|IO.PV | |IO.PV | ||
| Line 216: | Line 219: | ||
|IO.LgcIO.LB | |IO.LgcIO.LB | ||
|The <b>Main Valve (MV) Active</b> input. | |The <b>Main Valve (MV) Active</b> input. | ||
|- | |||
|IO.Mod 2.A | |||
|The Stage 2 output relay. | |||
|- | |||
|IO.RlyAA | |||
|The Stage 1 output relay. | |||
|- | |- | ||
|Lgc2 1 | |Lgc2 1 | ||
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|The output is active if the conditioned RTD measurement is less than the low-temperature threshold. | |The output is active if the conditioned RTD measurement is less than the low-temperature threshold. | ||
|- | |- | ||
|Lgc8 1 | |||
|Logically ORs four inputs, all inverted, from <b>Alarm 1</b>, <b>Alarm 2</b>, <b>DigAlarm 2</b> and the signal break output (<b>SBrkOut<b>) from <b>IO.PV</b>. The output is active unless any of the alarms are triggered or signal break is active. Essentially inhibits operation of Stage 1 and Stage 2 in the event of a fault condition. | |||
|Loop 1 | |Loop 1 | ||
|Operates an on-off control loop with a setpoint (Stage 2, displayed on the controller as "Stg2") and feedback via the conditioned RTD measurement. | |Operates an on-off control loop with a setpoint (Stage 2, displayed on the controller as "Stg2") and feedback via the conditioned RTD measurement. | ||