Eurotherm 3216/3116/3200 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 only confirmed at the hardware-verified rung.

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
pv_in	1	I16	0.1
tg_sp	2	I16	0.1
man_op	3	I16	0.1
wrk_op	4	I16	0.1
wkg_sp	5	I16	0.1
proportional_band	6	I16	1
control_action	7	I16	1
integral_time	8	I16	1
derivative_time	9	I16	1
alarm_1_threshold	13	I16	0.1
alarm_2_threshold	14	I16	0.1
active_setpoint_select	15	I16	1
timer_status	23	I16	1
setpoint_1	24	I16	0.1
setpoint_2	25	I16	0.1
remote_sp	26	I16	0.1
calculated_error	39	I16	0.1
instrument_status	75	U16	1
load_leakage_current	79	I16	0.1
load_on_current	80	I16	0.1
instrument_mode	199	I16	1
cjc_temperature	215	I16	0.1

link settings as documented (unverified): RTU; default 9600 8N?; unit ID 1; FC 06; Digital communications is optional and not available in 3116 controllers. The interface may be ordered as RS232 or RS485 (2-wire).

⚠ do not write continuously changing values to TG.SP, SP1, SP2. The memory technology used in this product has a limited (100,000) number of write cycles. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	terminals HD, HE and HF
A/B polarity	A(+) and B(-)
termination	220Ω termination resistor on last controller in the line
connector	screw terminals
isolation	Isolated 240Vac CAT II
wiring notes	RS232 or RS485 (2-wire)
broadcast	supported
protocol notes	The memory technology used in this product has a limited (100,000) number of write cycles for certain parameters like TG.SP, SP1, SP2.
identification notes	Comms Module Type register at 12544
power	High voltage supply: 100 to 240Vac, -15%, +10%, 50/60 Hz. Low voltage supply: 24Vac/dc, -15%, +10%
environment	ambient temperature is within 0 and 55°C (32 - 131°F) and humidity 5 to 95% RH non condensing.
accuracy	CT input accuracy: ±4% of reading.
certifications	European Directives on Safety and EMC, EN 61010, EN 61326
doc revision	Issue 2.0 Dec-04
firmware applicability	software version 2

generated by gemini:gemini-3.5-flash · harvested from https://docs.rs-online.com/a7b8/0900766b80695fa0.pdf (Eurotherm); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-10 · recorded 2026-06-10

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.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.