LU-S14000 Series I/O Modules

Overview
The LU-S14012 single-channel analog input module provides range adjustment, A/D conversion, isolation, signal processing, data and RS-485 data communication functions. It can acquire voltage and current signals over multiple ranges. 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 pulses with a maximum count of 65535, which can be read out by the host and is automatically cleared each time the module is restarted or powered up. The two digital outputs provide upper- and lower-limit alarm functions; the limits 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 loop currents and high-voltage surges. It supports the Modbus protocol and uses the RS-485 bus for communication transmission, with a built-in optocoupler providing 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 Source ramp ±20%Ut, time ramp 2s±20% Dip and temporary interruption 40%Ut, duration 5s

Analog input
•Effective resolution: 16 bits
•Input types: mV, V or mA
•Input ranges: ±150mV, ±500mV, ±1V, ±5V, ±10V, ±20mA
•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: ±6μV/°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