# Highway 21 site guide

Verified October 26, 2026 (America/Edmonton). Production target: https://www.atomhmi.com/site_highway_21/page_well_14. Site ID highway_21; device selector Water. This session inspected configuration only; no alarms, registers, polling, PLC values or pages were saved.

## Program mapping confirmed by user

| Program ID | Well |
| --- | --- |
| 0 | Well 5 |
| 1 | Well 15 |
| 2 | Well 16 |
| 3 | Well 4 |
| 4 | Well 7 |
| 5 | Well 8 |
| 6 | Well 9 |
| 7 | Well 12 |
| 8 | Well 13 |
| 9 | Well 14 |
| 10 | Well 18 |
| 11 | Well 19 |
| 12 | Spare |
| 13 | Spare |
| 14 | Spare |

## Verified register and alarm catalog

Water has 2,766 register definitions. Search card returns zero matches in the ID/description table. Search unlatched returns 170 entries; search fault returns 60 VFD entries. Existing families include GVL_Well[n]_out_flow_flt_chan_unlatched, GVL_Well[n]_out_lvl_flt_chan_unlatched and GVL_Well[n]_out_vfd_Fault_unlatched, for program indices 0–14. Do not equate these with the requested fault.card.unlatched without confirmation.

Opened GVL_Well[0]_out_flow_flt_chan_unlatched: slave Water PLC; address {"tag":"Application.GVL.Well[0].out.flow.flt.chan.unlatched"}; On Change, one second, Enabled unchecked. Many other unlatched entries are disabled. Definition presence does not establish live readings.

Water has 26 HMI alarm definitions: 12 well low-flow, 12 well low-level, and cistern high/low-level. Existing well entries for index 10 say Well 19 and index 11 say Well 18, opposite the user's mapping. This discrepancy was observed and left unchanged pending scope resolution.

## Requested card fault alarms pending source clarification

User requests all fault.card.unlatched alarms with clear descriptions. No card-named register was found. Clarification requested: new PLC tags requiring import versus existing flow/level channel fault outputs. Do not invent tag paths, register IDs or physical fault meanings. After confirmation, inspect exact sources, add missing definitions with equipment-specific descriptions and quoted Message/Return to Normal expressions, verify persistence, and update this guide.

## Target page observations

Well 14 has flow in gpm, water level in ft, totals in gal, time displays, level/flow trends, and low-flow/low-level enable, threshold and delay controls. Read-only snapshot: 0.0 gpm, water level 8.7 ft. No runtime controls operated. Existing alarm create form supports calculation, importance, latching, on/off delays, notification groups and enabled state; opening a draft was inspection only.