Indication of Hand-Off-Auto switch - Johnson Controls - LIT-1201668 - System Integration - LonWorks Integration - 12.0

LonWorks Network Integration with Network Engines and LCS Technical Bulletin

Johnson Controls
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LonWorks Integration
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Technical Bulletin
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The Focus and Summary screens (Figure 1) show the current condition of a Hand-Off-Auto (HOA) switch for all hardware outputs (analog and digital) supported by the FSC and the LN-PRG410/510 controllers using basic programming. The condition is indicated on the Focus and Summary screens for hardware output point types on these device types. If you place the switch in the Hand or Off position, the condition shown for its point is HW Override. The actual value for an analog output (AO) in the Hand position is unknown to both the FSC and the network engine. A binary output (BO) placed in the Hand position correctly reports the value to the FSC and the network engine. For LN-PRG410/510 controllers using basic programming, the network engine automatically reads the actual output for any point in Hand or Off mode, regardless of whether the point is binary or analog, as defined by the output potentiometer when you enable HOA. The LN-PRG410/510/610 controllers that use the graphical programming interface (GPI) do not support the HOA indication status feedback in Metasys; however, status is available in the local application. Optionally, you can add separate software points to the application to monitor HOA status feedback and you can map those points to Metasys.

Figure 1. HOA switch indication