NX3304 — 4-ch Thermocouple Input

The NX3304 measures temperature from thermocouple sensors (types B, E, J, K, N, R, S, T) over 4 independent channels with ±1 °C resolution at 16-bit output.

---

Hardware

Connection

n°	Item	Description
1	RUN LED	Green — EtherCAT state
2	ERROR LED	Red — EtherCAT error
3	I/O LEDs	Yellow — 4 TC input state
4	I/O connectors	Removable terminals
5	Internal Bus	Power supply and EtherCAT bus

Internal Bus

Thermocouple Input Signals

LED States

LED	State	Meaning
On/Run	Off fixed	Initialization
On/Run	Slow blinking	Pre-Operational
On/Run	Single blink + pause	Safe Operational
On/Run	On fixed	Operational
On/Run	Off or fast blinking	Boot
Error	On fixed	No connection

---

Software

EtherCAT I/O Mapping — TxPDO

Channel	Value
TC Input 1–4	INT16 each (temperature, °C)

SDO Configuration — SDO 8000h

Sensor type selection per channel (default: J):

Index	SubIndex	Description
8000h	1–4	Sensor type for channels 1–4

---

Technical Data

Parameter	Value
Channels	4
Sensor types	B, E, J (default), K, N, R, S, T
Temperature resolution	±1 °C
Update time	10 ms
Module accuracy	±0.1 % recommended scale @ 25 °C ambient
Resolution	16 bit
Temperature range type B	600 °C … 1700 °C
Temperature range type E	−200 °C … 800 °C
Temperature range type J	−40 °C … 1100 °C
Temperature range type K	−200 °C … 1200 °C
Temperature range type N	−200 °C … 1250 °C
Temperature range type R	0 °C … 1600 °C
Temperature range type S	0 °C … 1600 °C
Temperature range type T	−200 °C … 350 °C
Current absorbed	30 mA

---

Module Installation

Mount on DIN rail (DIN EN 60715). Connect to the left via the T-bus connector. Always power off before inserting.