37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
---
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task: Create sub-items (integrator, min-max)
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version: R1.03
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source: IM 36K10G10-01EN §3.1.5, §3.2.3; practiced with CI-Eng-Sample 2026-09-30
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status: verified
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---
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# Sub-items
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A sub-item hangs under an item (`<Section>.<Tag>.<Sub>`) and processes the main item's value.
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Types: `Integrator`, `Min-Max`, `Pulse`, `Rate-of-Change`, `Typeless`. Sub-items cannot connect
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to equipment, cannot have sub-items, and are **not** blocked when the main item is blocked.
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Quick load (`SUB_ITEM_DF`; the main item must exist):
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```
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@FIELDS
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NAME,DESCRIPTION,SUB_TYPE,TIME_UNIT,MIN_MAX
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@SUB_ITEM_DF
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"CI-Eng-Sample.PUMP1.RUNNING.RUN_SECONDS","Pump 1 running time (seconds)","Integrator","",""
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"CI-Eng-Sample.TANK1.LEVEL.MAX","Tank 1 maximum level","Min-Max","","Maximum"
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```
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Load with `dssqld -i <file>.qli -l <file>.qlo`; remove with a `NAME`-only file and `dssqld -r`
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(before removing the main item).
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## Behaviour (verified)
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- **Integrator** adds *value × seconds*: with the main item at 1 it grows by 1 per second.
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`TIME_UNIT` (e.g. `Hour`) made no difference (`knowledge/issues.md` ISS-010); to show hours,
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divide by 3600 where the value is used.
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- **Min-Max** with `MIN_MAX` = `Maximum` (or `Minimum`) keeps the highest (lowest) value
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written to the main item: writing 30, 70, 50 gave 70.
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- `TIME_UNIT` (Second, Minute, Hour, Day) belongs to Rate-of-Change (from docs, not practiced).
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Example files: `examples/CI-Eng-Sample/02b_sub_item_df.qli`, `90b_remove_sub_item_df.qli`.
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