LU-S14000 Series I/O Modules

Overview
The LU-S14011 single-channel thermocouple input module provides range adjustment, A/D conversion, isolation, signal processing, data processing and RS-485 data communication functions. It can acquire J, K, T, E, R, S and B type thermocouples with cold-junction compensation, and can also acquire voltage, current and other signals. In addition, it provides two digital outputs and one digital input. The event counter is connected to the digital input channel and can measure external low-speed pulses, with a maximum count of 65535 that can be read out by the host and is automatically cleared each time the module restarts or is powered up. The two digital outputs serve as upper- and lower-limit alarms; the upper and lower limit thresholds are downloaded from the host to the module EEPROM, and the alarm function can be enabled or disabled remotely. When an alarm is activated, digital output channel 1 indicates the upper-limit alarm status and digital output channel 0 indicates the lower-limit alarm status. The optical isolation and voltage isolation of the A/D input reach 3000V, effectively preventing ground circulating currents and high-voltage surges. It supports the Modbus protocol and uses the RS-485 bus for communication transmission; a built-in optocoupler provides 3000V isolation voltage. It features surge protection, spike absorption and lightning protection.

Main features
Superior immunity to interference (EMC)
• High ESD immunity Test results: air discharge ±12KV; contact discharge ±6KV
• Easily passes 3KV fast transient burst interference (EFT test)
• Lightning surge impact protection ±2KV
• Radiated noise immunity test An analog noise interference source is provided through a winding (Impulse voltage: 1KV, Impulse width: 1us); no abnormality after 10 min of application
• Voltage dips, short interruptions and voltage variation immunity test Power supply ramp ±20%Ut, time ramp 2s±20% Voltage dip and temporary interruption 40%Ut, duration 5s

Analog input
• Effective resolution: 16 bits
• Channels: eight, fully differential
• Input types: thermocouple, mV, V or mA
• Input ranges: ±15mV, ±50mV, ±100mV, ±500mV, ±1V, ±2.5V, ±20mA
• Thermocouple types: J K T E R S B
• Cold junction compensation: yes
• Isolation voltage: 3000Vdc
• Input surge protection: yes
• Sampling rate: 10 samples/s
• Input impedance: 20MΩ
• Bandwidth: 2.62Hz
• Accuracy: ±0.05% or better
• Zero drift: ±3μV/°C
• Full-scale drift: ±25ppm/°C
• CMR @ 50 / 60Hz: 150dB
• NMR @ 50 / 60Hz: 100dB

Digital input
• Number of channels: 1
• Logic 0: max +1V; logic 1: +3.5V~+30V
• Pull-up current: 0.5mA; 10kΩ resistor connected to +5V
• Can be used as event counter:
• Max input frequency: 50Hz; min input pulse width: 1sec

Digital output
• Number of channels: 2
• Open-collector output under max load 30V, 30mA
• Power dissipation: 300mW

Communication
• Mode: RS-485
• Protocol: Modbus
• Isolation voltage: 3000Vdc
• Surge protection, lightning protection: yes

Built-in watchdog timer
Power supply
• Power requirement: +10~+30Vdc (unregulated)
• Power consumption: 1.4W