ci-server-engineer/.claude/skills/system-management/tasks/read-write-item.md
cliu 83af63ab53 R1.05 re-check batch 2: graphics, history, portal, system-management, items
Full manual diffs (C50, R30, C60, L20, C40, L35, R10, R20, J10, L30, L50,
P30, G10, C10) and read-only checks on the shared R1.05 test server where
the permission system allowed them. Skills and summaries moved to R1.05.
Issues ISS-092..129 (gaps 104-107, 114-115, 130-131 unused); ISS-074
closed (manual and software agree), ISS-091 corrected by ISS-119.
version-differences: unlisted manual changes and installed-only changes.
r105-verification: V5-V9 and new not-tested rows.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-08 19:29:15 +11:00

3.3 KiB

task version source status
Read and write item values with itmval R1.05 (first written for R1.03) IM 36K10J10-01EN §2.9.2 (5th ed., Feb. 2026); practiced on the test system and CI-Eng-Sample 2026-09-30 (R1.03) verified on R1.03 (2026-09-30, all examples below); itmval -p/-g used on R1.05 in the CI-Eng-Sample test, 2026-10-08; read output format, limit read and error messages re-checked read-only on the R1.05 test server 2026-10-08

Read and write item values (itmval)

Needs CI Server running. Reading is read-only. Writing changes live data: follow the user's chosen way of working (direct vs prepare only) and never write to an item that drives real equipment without explicit approval.

Item names are full paths: <Section>.<Sub-section>.<Tag>, e.g. CI-Eng-Sample.TANK1.INFLOW from the sample project.

Read the current value

itmval -g -n <Section>.<Tag>

Output:

Value   = 130
Status  = 9
Options = 0xffffff88.00 ack
Quality = 0
  • Status is a number from STATUS_DF (export it with dssqld -e status_df.qli -d STATUS_DF -c to look numbers up). Common ones: 9 NORMAL, 13 NOT INIT (never written; new items start here), 4 / 5 BOOLEAN 0 / BOOLEAN 1, 11 HIGH HIGH.
  • Options lists item flags as words after the hex value (option bits, IM 36K10C10 §3.5): blk 1 blocked, off 2 offline (station not communicating), uoff 4 updated offline (written by an application such as itmval while offline), ack 8 acknowledged, ublk 16 updated blocked (written while blocked, e.g. with -o); 32/64 direct/delayed alarm. So writing a station item whose station is down adds uoff (0x…8a → 0x…8e); internal items (no station) never get it.

Read limits

itmval -g -n <Section>.<Tag> -a <n>

<n>: 1 deadband, 2 low, 3 high, 4 low-low, 5 high-high. The limit is returned in Value. Items with no limits configured return ITM-E-WRONG_ATT, Wrong attribute number used (same on R1.05). An item name that does not exist gives VIS-W-NOTFOUND, Record not found followed by ISF-E-NOREC / GIN-E-GET lines (R1.05, 2026-10-08).

On R1.05 ITEM_VAL also has the fields ENG_UNIT, SCALE_HIGH_LIMIT and SCALE_LOW_LIMIT (installed item_val.dss); itmval itself has no option for them.

Write a value

itmval -p -n <Section>.<Tag> -v <value> [-s <status>] [-q <quality>]
  • Read the item first and note its value, so it can be restored.
  • Booleans take -v 0 / -v 1; the status follows automatically (4 / 5).
  • -s sets the status explicitly (e.g. -s 9 NORMAL). Without it, a numeric write gives 9.
  • -o overwrites a blocked item; -t [<date>] <time> [GMT|LST] sets the timestamp (default local civil time); -e writes to event history only, not the current value.
  • Read it back to confirm.

Verified examples (CI-Eng-Sample, R1.03)

On R1.05 the CI-Eng-Sample test (2026-10-08) used itmval -p and -g on the sample items in the same way, with the same output format (Value / Status / Options / Quality).

Command Result
itmval -p -n CI-Eng-Sample.TANK1.INFLOW -v 120.5 Value 120.5, status 9
itmval -p -n CI-Eng-Sample.TANK1.INFLOW -v 130 -s 9 Value 130, status 9
itmval -p -n CI-Eng-Sample.PUMP1.RUNNING -v 1 Value 1, status 5 (BOOLEAN 1)
itmval -g -n CI-Eng-Sample.TANK1.LEVEL -a 2 / -a 3 / -a 4 / -a 5 20 / 80 / 10 / 90