FBM204 FOXBORO
FOXBORO FBM204
Four 20 mA DC analog input channels and four 20 mA DC analog output channels, each
The channels are isolated and independent.
Input/output range
(per channel)
0 to 20.4mAdc (nominal)
Input channels (four) · Accuracy (including linearity):
± 0.03% of span
·Precision temperature coefficient:
±50 ppm/℃
·Input signal A/D conversion:
Each channel uses an independent Siama Delta converter to perform A/D signal conversion
·Input channel impedance:
61.5 Ω nominal
·Integral period:
Software configurable
·Common mode suppression:
>100 db @ 50 or 60Hz
。 Normal mode suppression:
>95 db @ 50 or 60Hz
。 Field equipment wiring distance:
The maximum distance between on-site equipment and FBM is compliant
A function of voltage (20.2Vdc, 20.4mA input), wire gauge, and field device voltage drop.
·Loop power protection:
Each channel is characterized by inter channel current isolation, current limiting, and
Stabilized voltage, all analog inputs are limited by their design to less than 30 mA, if
The current limiting circuit is short circuited and the current is limited to around 100mA
describe
FBM204 0 to 20mA input/output includes four 20mA DC analog input channels
And four 20 mA DC analog output channels,
Each input channel accepts analog sensor inputs, such as 4 to 20 mA transmitters
Or self powered 20 mA source. Each output channel drives an external load and
Generate 0 to 20mA output, with input/output isolated from other channels and ground currents
FBM204 execution will
The electrical input/output signals from field sensors are connected to the optional redundant fieldbus for signal conversion. FBM204
Execute a simulated 1/O application that provides the following
Configurable options: transition time, fail safe configuration (hold/fall back), and
Analog output fault safe fallback data (based on each channel), fieldbus module
(FBM) can be changed to execute distributed PIDA (DPIDA) applications to
Provide a fast control loop that operates within it.
FBM204 is electrically compatible with standard HART signals.
FBM204 has a sturdy extruded aluminum casing that can be
The circuit provides physical protection. According to ISA standard S71.04, enclosures designed specifically for installing FBM are available in various levels
Environmental protection, up to harsh environments.
Visual indicator module
Front integrated red and green light emitting diodes (LEDs)
Provide visual status indication of FBM function.
Easy to disassemble/replace
This module is installed on the Compact 200 series substrate, and the two screws on the FBM will
Fix the module to the substrate.
The module can be removed/replaced without the need to remove on-site equipment terminal cables, power or communication cables.
Fieldbus communication
The fieldbus communication module or control processor is connected to the
The redundant 2 Mbps module fieldbus used by FBM. FBM acceptance
Communication from any path (A or B) of the 2 Mbps fieldbus, if one path
Unsuccessful or system level switch, module will continue
Communicate through active paths.
Modular base plate installation
The module is installed on a modular base plate mounted on DIN rails,
Can accommodate up to four or eight FBMs. Modular base plate adopts DIN rail installation or rack installation, including for redundant fieldbus and redundancy
Signal connectors for independent DC power supply and termination cables,
characteristic
。 Four 20mA DC analog input channels
Four 20 mA DC analog output channels
。 Each input and output channel is electrically isolated. Rugged design suitable for G3 grade (harsh) environments
Execute simulated 1/O application, provide conversion time and
Configurable options for rate of change restrictions
。 High accuracy achieved through sigma delta data conversion for each channel
Terminal assembly (TA) for connecting field wiring to Compact FBM204 locally or remotely
。 TA is used in conjunction with the output bypass station to maintain output during maintenance operations
。 Internal and/or external loop powered transmitters for each channel
Layer 3 terminal components for. Support the use of dry DPIDA control blocks for high accuracy. In order to achieve high accuracy, this module integrates Sama Delta data conversion on the basis of each channel, providing a new analog input read every 25 milliseconds
Number, as well as a configurable integration period, to eliminate any process and/or noise and power line frequency. At each time period, FBM converts each analog input into digital values,
