951EN, 952EN: Ethernet Analog and Discrete I/O Modules

951EN: Combo module, analog current inputs
952EN: Combo module, analog voltage inputs

These Ethernet analog and discrete I/O modules provide an isolated Ethernet network interface for analog and discrete I/O signals. Multi-range analog inputs and outputs support a wide variety of industrial devices. High-resolution, low noise, A/D and D/A converters deliver high accuracy and reliability. 3-way isolation further improves system performance. The discrete I/O provide monitoring and control of on/off, high/low, or open/close industrial devices. Tandem I/O provides output level control and status verification in one unit.

The i2o function lets inputs on one module write directly to outputs on another module. Available for Modbus TCP/IP communication only.

Analog Input Ranges:
DC Current (user-selectable ranges)
0 to 1mA, 0 to 11mA, 0 to 20mA, 4 to 20mA
0 to 20 amps AC (with optional AC sensor)

DC Voltage (user-selectable ranges): ±1V, ±5V, ±10V DC

Analog Output Ranges
DC Current (user-selectable ranges)
0 to 1mA, 0 to 20mA, or 4 to 20mA
(0 to 625 ohm loads, typical)

Discrete I/O Range
0 to 35V DC active-high inputs
Current sourcing (high-side switched) outputs

Network Communication:
EtherNet/IP
Modbus TCP/IP, (i2o® peer-to-peer available for Modbus TCP/IP only)
10/100 network

Power Requirement: 15 to 36V DC supply (3.3 Watts) required

Approvals
CE/ATEX marked
UL, cUL listed, Class I; Div. 2; Groups A, B, C, D
EtherNet/IP, Modbus/TCP conformance tested

Performance Specifications

Analog Input

Configuration
Four input channels
Input range is selectable as a 4-channel group

Accuracy
Better than ±0.05% of span (0.1% for 0-1mA range), typical
Accuracy near or below 0mA or 0V is degraded if input COM shares AO/DIO RTNs

Analog to Digital Converter (A/D)
16-bit Σ-∆ converter
Resolution: 0.005% or 1 part in 20000

Noise Rejection
Normal Mode: Better than 40dB @ 60Hz
Common Mode: Better than 140dB @ 60Hz

Input Conversion Rate: Less than 50mS per channel

Input Impedance

DC current input (951EN): 49.9 ohms
DC voltage input (952EN): Greater than 110.5K ohms

Analog Output

Configuration
Two output channels
Individually selectable ranges

Accuracy: Better than ±0.05% of span (0.1% for 0-1mA range), typical

Digital to Analog Converter (D/A): 16-bit converter

Current Output Compliance: 12V minimum, 13V typical

Current Output Load Resistance Range: 0 to 625 ohms, typical

Discrete Input

Input Type
Six independent, active-high, buffered inputs with a common connection
Built-in 5.6K ohm pull-down resistors socketed for 3-channel groups

Input Signal Voltage Range: 0 to 35V DC, maximum

Input Impedance: 100K ohms, typical

Input Signal Threshold: TTL compatible with 100mV of hysteresis, typical

Discrete Output

Output Type
Six independent, open-source, MOSFET switches

Output Voltage and ON Resistance
Up to 35V DC maximum (0 to 330mA/ch continuous)
0.15 ohms maximum ON resistance

Environmental

Ambient Temperature and Humidity
Operating: -25 to 70°C (-13 to 158°F)
Storage: -40 to 85°C (-40 to 185°F)
Relative Humidity: 5 to 95%, non-condensing

Isolation
1500V AC for 60 seconds or 250V AC continuous
3-way isolation between I/O, network, and power

NOTE: i2o function only on Modbus TCP/IP modules

Additional information