Gotchas

Timeout immediately

Field	Detail
Symptom	The read or write node reports a timeout as soon as you deploy or trigger it.
Root cause	KV Host Link uses port `8501`, not the SLMP/Computerlink port `1025`.
Fix	Open the `kvhostlink-connection` node and set Port to `8501`.

Field	Detail
Symptom	Writing `T` or `C` preset values returns a PLC error such as `E1`.
Root cause	Preset writes through Host Link `WS` and `WSS` are supported on KV-8000/7000-series CPU units, not every KV model.
Fix	Do not write `T` or `C` presets on unsupported models; use read nodes for timer/counter monitoring.

Field	Detail
Symptom	`X` or `Y` addresses are rejected by the editor or by the PLC.
Root cause	`X` and `Y` use decimal-bank plus hex-bit notation. `X10F` means bank 10, bit F.
Fix	Use `X10F`, not `X275`, and select an `-xym` profile when you want XYM aliases.

Field	Detail
Symptom	`R`, `MR`, `LR`, or `CR` addresses are rejected.
Root cause	These bit-bank families require two-digit bit notation.
Fix	Use `R200`, `MR100`, or another form whose low two digits are `00` through `15`.

Field	Detail
Symptom	`DM100.D` behaves like a bit read instead of an unsigned 32-bit read.
Root cause	Dot notation means bit-in-word access.
Fix	Use `DM100:D` for an unsigned 32-bit value.

Field	Detail
Symptom	A write to `DM145:COMMENT` is rejected.
Root cause	`:COMMENT` is read-only through the high-level API.
Fix	Use `DM145:COMMENT` only with `kvhostlink-read`.

Field	Detail
Symptom	`DM150.3,4` or a similar bit-in-word count is rejected.
Root cause	Bit-in-word addresses do not support `,count`.
Fix	Use `DM150.3` for one bit, or use a direct bit family such as `R200,4` for bit arrays.