Reference ↔ offset
FC03Reference 40001
Zero-based PDU offset 0
community toolsAll web tools ↗PROTOCALL TOOLS / 04 / PROTOCOL & DATA
Stop guessing
what the wire means.
Small calculators for the values that should be obvious but rarely are: protocol offsets, polling budgets and controller address conventions.
01 / POLL PLANNER
Make a 1-second loop honest.
Use the expected reply, timeout and device count to see when an intended cycle is going to drift. It is a planning estimate—not a substitute for a captured production trace.
02 / ADDRESS HELPERS
State the convention before using it.
Address syntax is a contract. These helpers keep the human-facing label beside the protocol-facing value so a handover can show both.
DB address formatter
1-byte valueDB1.DBX0.0
Verify endianness and data type separately.
Symbolic or CIP path
Symbolic tag pathPump[2].Speed
Use the controller's tag name exactly; this is not a fixed register address.