924 MB

Key Features:

This signal conditioner is a four-channel analog input module with four discrete outputs designed to filter and linearize  thermocouple inputs while providing isolation between input, output, power, and network circuits.

• Standard Modbus-RTU protocol with high-speed RS-485 communication (up to 115K bps)
• 16-bit sigma-delta A/D yields 0.1°C resolution and 0.5°C measurement accuracy
• Thermocouple linearization and sensor break detection ensure reliable measurements
• Four discrete outputs enable local temperature limit alarms or host-controlled on/off switching
• Heavy-duty 1A solid-state relays provide dependable on/off control of industrial devices
• Self-calibration lowers maintenance costs by reducing periodic manual calibration checks
• Watchdog timers provide a configurable failsafe output state for use when host I/O communication is lost
• Four-way isolation eliminates potential ground loops between power, input, output and network circuitry
• Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication
• Operating temperature: -25°C to +70°C (-13°F to +158°F).

Product Details

General Input

– ±100mV DC input: 0.1%.
– Thermocouple input: 0.1°C (0.18°F).
Ambient Temperature Effect
– Better than ±0.005% of input span per °C, or ±1.0uV/°C, whichever is greater.
Noise Rejection
– Normal mode: 40dB @ 60Hz, typical.
– Common mode: 140dB @ 60Hz, typical.
Input Filter Bandwidth
– -3dB at 3Hz, typical.
Input Conversion Rate
– 90ms per channel.

Thermocouple Input

Thermocouple Input Ranges
– Thermocouple type user-configured. Type selected applies to all channels. Signal linearization, cold-junction compensation, and open circuit or lead break detection are included.
Thermocouple Break Detection
– TC sensor failure can be configured for either upscale or downscale. Selection applies to all channels.

DC Millivolt Input

Millivolt Input Ranges
– ±100mV DC.
Millivolt Input Accuracy
– ±0.1% of input range.

Discrete Output

Output Type
– Four independent open drain MOSFET switches with a common return that operate as low-side switches.
Output Voltage Range
– 0 to 35V DC, 1A DC maximum for each output.
External voltage source required.
– Output ON Resistance.
– 0.15 ohms maximum.
Output Response Time
– 4.1ms typical, from receipt of command to gate transition of the output MOSFET.


Supported Modbus Commands
The command/response protocol for communicating with this module adheres to the Modbus/RTU standard for the following Modbus Functions.
• Read Coil
• Read Holding Registers
• Read Input Registers
• Force Single Coil
• Preset Single Register
• Force Multiple Coils
• Preset Multiple Registers
• Report Slave ID
• Reset Slave
LED Indicators
LEDs indicate power, status, and discrete level/alarm.

Power and Isolation

Power Requirements
- 10 to 36V DC,
– 22 to 26V AC.
Supply Current
- Supply Current    Draw
– 10V DC                  100mA maximum
– 24V DC                 45mA  maximum
– 24V AC                 85mA rms maximum


1500V AC for 60 seconds or 250V AC continuous. 4-way isolation between input, network, power and discrete I/O circuits. Inputs are isolated channel-tochannel for common mode voltage to ±5V DC.