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ci-server-engineer/.claude/skills/item-engineering/tasks/block-item.md
cliu ef543cde20 Add phase 5 Engineering Module summary, authorization skill, item tests 
- Summary of IM 36K10C10 (Engineering Module - I/O Processes), checked
  against dssana.sup, itm.sup and the default datasets
- New skill authorization: users and authorization groups by quick load
- item-engineering: string item limits (1-200, holds length - 1) and the
  integration granule (itm_int_secs), both tested on CI-Eng-Sample
- CI-Eng-Sample: read-only authorization group CIENG_VIEWER
- Closed ISS-001 (uoff/ublk option bits), ISS-010, ISS-019; new ISS-018, ISS-020

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-30 17:09:45 +10:00

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task version source status
Block / unblock an item and write to a blocked item R1.03 IM 36K10G10-01EN §3.3, §3.4; practiced with CI-Eng-Sample 2026-09-30 verified

Block / unblock an item

A blocked item is not updated (e.g. during device maintenance). Blocking can be done per item, sub-item or section; sub-items of a blocked item keep working. Changes live behaviour: follow the user's chosen way of working.

Block (BLOCKED 1) or unblock (BLOCKED 0) with an update file and dssqld -m:

@FIELDS
NAME,BLOCKED

@ITEM_DF
"<Section>.<Tag>",1

dssqld -m block.qli -l block.qlo

(Engineering Module: right-click the item or section › Block/Unblock.)

Behaviour (verified on CI-Eng-Sample.TANK1.INFLOW)

  • Blocked: option flag blk appears in itmval -g; the status number is unchanged (stayed 9).
  • itmval -p -n <item> -v <value> on a blocked item is silently ignored (no error, value unchanged; knowledge/issues.md ISS-011). Add -o to overwrite: itmval -p -n <item> -v <value> -o.
  • After unblocking, blk is gone but ublk (option bit 16, updated blocked) remains: the item was written by an application (itmval -o) while it was blocked (IM 36K10C10 §3.5, ISS-001).