811A / 812A

Key Features:

• Integrated microcontroller performs intelligent signal processing for advanced alarm functions.
• Windows XP/Vista/7 software configuration speeds setup and replacement.
• Push-button reprogrammability facilitates changes in the field without a host PC.
• Multi-purpose inputs accept numerous ranges to reduce spare stock requirements.
• High-resolution Sigma-Delta A/D converter delivers high accuracy with low noise.
• Input excitation supply on each input provides power for a two-wire transmitter.
• Dual alarm operation lets you perform two alarm functions at the same time.
• Operating temperature range: -25 to 70°C (-13 to 158°F).

Product Details

DC Current Input

DC Current Input Range
0 to 5mADC ,189nA/LSB
0 to 22mA DC, 757nA/LSB
DC Current Input Impedance
24.9 ohms.
Excitation Supply (for 2-wire instruments)
+15V DC, 24mA maximum.

DC voltage Input

Input impedance
Greater than 500K ohms.

AC Current Input

AC Current Input Range (optional)
An optional external AC current sensor is required to monitor AC current signals (Model 5020-350).

USB Interface

USB Connector
Type: USB Mini-B type socket, 5-pin.
Data rate: 12Mbps. USB v1.1 and 2.0 compatible.
Maximum cable length: 5.0 meters.
USB Transient Protection
Transient voltage suppression on power and data lines.
Not required. Uses Windows HID drivers.


Output Channel Configuration
– 16 DC voltage outputs.
Output Ranges (per-channel basis)
– ±5V, ±10V DC (at ±1mA). User-configured on a per-channel basis.
Output Impedance
– 1 ohm maximum.
Output Resolution and Accuracy
– Resolution (±10V): 16-bit maximum, 0.00166%.
– Resolution (±5V): 15-bit maximum, 0.00305%.
– Accuracy: Better than 0.05% of range.

Ethernet Communication

– Failsafe or non-failsafe (user-configurable) relay trips on power or link-loss failure.
– SPST-NO, 1 Form A, Class I, Division II approved.
– 3A @ 24V DC/250V AC, 100,000 cycles general.
– 2A @ 24V DC/250V AC, Hazardous locations.
Maximum Switching Voltage and Power
– 250V AC / 750VA, 125V DC / 90W.


Internal Switch or Hub/Repeater
– Dual-port Ethernet switch.
– User-configurable as a true switch (default mode) or low-latency hub.
Network Connector [10/100 Base-T(X)Copper]
– One or two 8-pin RJ-45 connectors.
– Automatic MDI/ MDI-X. 100m communication distance.
Network Connector (100 Base-FX Fiber-optic)
– One multi-mode with SC connector. 2km communication distance. Full/half-duplex, selectable.
– Modbus TCP/IP, UDP/IP, i2o peer-to-peer.
– StaticIP, DHCP, BootP.
Ethernet Modbus TCP/IP Sockets/Sessions
– 1-10 socket/sessions user-configurable.
Ethernet Redundancy
– Compatible with STP, RSTP, or any ring scheme.


Operating and Storage Temperature
– Operating: -40 to 70°C (-40 to 158°F).
– Storage: -40 to 85°C (-40 to 185°F).
Power Requirements
– 18-36V DC. Redundant, diode-coupled terminals.
– 4.8W (copper ports), 5.8W (fiber-optic ports).
– I/O, power, relay and Ethernet port-to-port.
– Peak: 1500V AC, ANSI/ISA-82.01-1988.
– Continuous: 250V AC, 354V DC (150V AC ch-ch).

Safety Approvals

- CE marked and UL/cUL Listed.
– Hazardous Locations: Class I; Div 2; A, B, C, D.
– Open board units: UL Recognized.
– Shock and Vibration Immunity (in enclosure)
– Mechanical Shock: 50g (3ms), 30g (11ms).
– Random Vibration: 5g, (5-500Hz).