Siemens SITRANS LT500 level controller

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire. Word order and scaling are confirmed at the hardware-verified rung and at no rung below it.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

point	address (0-based)	type	scale	unit
pt1_space	3200	F32BE	1
pt1_distance	3202	F32BE	1
pt1_volume	3204	F32BE	1
pt1_head	3206	F32BE	1
pt1_temperature	3208	F32BE	1
pt2_space	3210	F32BE	1
pt2_distance	3212	F32BE	1
pt2_volume	3214	F32BE	1
pt2_head	3216	F32BE	1
pt2_temperature	3218	F32BE	1
level_difference	3220	F32BE	1
level_average	3222	F32BE	1
auxiliary_temperature_input	3224	F32BE	1
pt1_volume_flow	3014	F32BE	1
pt2_volume_flow	3018	F32BE	1
pt1_input_current	3801	F32BE	1	mA
pt2_input_current	3803	F32BE	1	mA
pt1_sensor_raw_level	3807	F32BE	1
pt2_sensor_raw_level	3809	F32BE	1
loop_current_1	8803	F32BE	1
loop_current_2	9103	F32BE	1
totalizer_1	8300	F32BE	1
totalizer_2	8400	F32BE	1
totalizer_3	8500	F32BE	1
totalizer_4	13601	F32BE	1
pt1_rate_of_change	3823	F32BE	1
pt2_rate_of_change	3836	F32BE	1
di1_scaled_state	3485	U16	1
di2_scaled_state	3486	U16	1
pt1_level_status	3487	U16	1
pt2_level_status	3488	U16	1
pt1_volume_status	3489	U16	1
pt2_volume_status	3490	U16	1
total_runtime_sensor_point_1	4856	F32BE	1
total_runtime_sensor_point_2	4858	F32BE	1
total_runtime_transmitter	6160	U32BE	1
time_since_last_power_on	6162	U32BE	1
namur_status	6228	U16	1
global_alarms_status	6246	U16	1

link settings as documented (unverified): RTU; default 19200 8??; FC 03,04,06,07,08,16,17,23

bench facts as documented (unverified)

connector	EIA-RS485
identification notes	Supports Report Server ID (FC17) returning SIEMENS SITRANS LT500
FC 43 device ID	not supported
doc revision	1

field reports — community-sourced, unverified (checked 2026-06-11)

confirmed: Baud rates [1200, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200] and default baud 19200 — confirmed by Siemens SITRANS LT500 Operating Instructions
confirmed: Modbus RTU framing and supported function codes (3, 4, 6, 7, 8, 16, 17, 23) — confirmed by Modbus RTU Data Map for SITRANS LT500
confirmed: Physical connector EIA-RS485 — confirmed by SITRANS LT500 Operating Instructions
confirmed: Report Server ID (FC17) returning product name and version — confirmed by Modbus RTU Data Map for SITRANS LT500
confirmed: Process measurement registers (pt1_space @ 3200, pt1_distance @ 3202, pt1_volume @ 3204, pt1_head @ 3206, pt1_temperature @ 3208, pt2_space @ 3210, pt2_distance @ 3212, pt2_volume @ 3214, pt2_head @ 3216, pt2_temperature @ 3218, level_difference @ 3220, level_average @ 3222, auxiliary_temperature_input @ 3224) — confirmed by Modbus RTU Data Map for SITRANS LT500
confirmed: Volume flow and current registers (pt1_volume_flow @ 3014, pt2_volume_flow @ 3018, pt1_input_current @ 3801, pt2_input_current @ 3803, pt1_sensor_raw_level @ 3807, pt2_sensor_raw_level @ 3809, loop_current_1 @ 8803, loop_current_2 @ 9103) — confirmed by Modbus RTU Data Map for SITRANS LT500
confirmed: Totalizer registers (totalizer_1 @ 8300, totalizer_2 @ 8400, totalizer_3 @ 8500, totalizer_4 @ 13601) — confirmed by Modbus RTU Data Map for SITRANS LT500
confirmed: Rate of change and status registers (pt1_rate_of_change @ 3823, pt2_rate_of_change @ 3836, di1_scaled_state @ 3485, di2_scaled_state @ 3486, pt1_level_status @ 3487, pt2_level_status @ 3488, pt1_volume_status @ 3489, pt2_volume_status @ 3490) — confirmed by Modbus RTU Data Map for SITRANS LT500

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
interop-verified — Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

If your device isn't here, upload its register map. Generation is free, and the connector keeps the rung it earns under testing.

To prove a connector against your own device, order hardware verification. If it doesn't verify, you don't pay.

Platform builders can license the verified library: machine-readable maps, the firmware matrix, API access.