Supply Foxboro FBM204 I/O Module Wholesale Factory

Functional Specifications

Input/Output Channels	Four 20 mA dc analog input channels and four 20 mA dc analog output channels. Each channel is isolated and independent.
Input/Output Range (Each Channel)	0 to 20.4 mA dc (nominal)
Input Channels (Four)	Accuracy (Includes Linearity): ±0.03% of span
	Accuracy Temperature Coefficient: ±50 ppm/ºC
	Input Signal A/D Conversion: Each channel performs A/D signal conversion using an independent Sigma-Delta converter.
	Input Channel Impedance: 61.5 Ω nominal
	Integration Period: Software configurable
	Common Mode Rejection: >100 db at 50 or 60 Hz
	Normal Mode Rejection: >95 db at 50 or 60 Hz
	Field Device Cabling Distance: Maximum distance of the field device from the FBM is a function of compliance voltage (20.2 V dc at 20.4 mA input), wire gauge, and voltage drop at the field device.
	Loop Power Supply Protection: Each channel is channel-to-channel galvanically isolated, current limited, and voltage regulated. All analog inputs are limited by their design to less than 30 mA. If the current limit circuit shorts out, the current is limited to about 100mA.
Communication	Communicates with its associated control processor through the redundant 2 Mbps module fieldbus.
Power Requirements	Input Voltage Range (Redundant): 24 V dc +5%, -10%
	Consumption: 7 W
	Heat Dissipation: 3.5 W

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Deatails of FOXBORO FBM204

Overview

The FBM204, 0 to 20 mA Input/Output contains four 20 mA dc analog input channels and four 20 mA dc analog output channels.

Each input channel accepts an analog sensor input such as a 4 to 20 mA transmitter, or a self-powered 20 mA source. Each output channel drives an external load and produces a 0 to 20 mA output. The inputs/outputs are galvanically isolated from other channels and ground.

Features

♦ Four 20 mA dc analog input channels

♦ Four 20 mA dc analog output channels

♦ Each input and output channel is galvanically isolated

♦ Rugged design suitable for enclosure in Class G3 (harsh) environments

♦ Execution of an analog I/O application program that provides conversion time and configurable options for Rate of Change Limits

High Accuracy

For high accuracy, the module incorporates Sigma-Delta data conversion on a per channel basis, which provides new analog input readings every 25 ms, and a configurable integration period to remove any process and/or noise and power line frequencies. Each time period, the FBM converts each analog input to a digital value, averages these values over the time period and provides the averaged value to the controller.