FOXBORO FBM04

Description

FOXBORO FBM04
The 0 to 20 mA Input/Output Interface Module
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 module performs
the signal conversion required to interface the
electrical input/output signals from/to the field sensors
and actuators to/from the redundant Fieldbus. The
module is a main type, and independently connects to
the redundant Fieldbus.
This module executes the analog I/O application
program. The configurable options for this program
are Analog Input Resolution (on a per module basis),
Fail-Safe Configuration (Hold/Fallback), Analog
Output Fail-Safe Fallback Data, (on a per channel
basis), Fieldbus Switching Enable and Fieldbus
Switching Time.
An optional style of termination cable assembly is
available which includes built-in bypass jacks for each
output channel on the front connector of the Fieldbus
Module. Jacks accept a bypass plug from the
I/A Series Output Bypass Station or other external
20 mA source. This option should be considered for
applications where maintaining output is desired
during maintenance operations, for example, when
replacing a failed module.Common Characteristics
POWER REQUIREMENTS
Input Voltage Range (Redundant)
26 to 42 V dc
Consumption
14 W (maximum)
Heat Dissipation
12 W (maximum)
Isolation
The module withstands, without damage, a potential
of 600 V ac applied for one minute between any
channel and earth (ground), or between a given
channel and any other channel.
NOTE
This does not imply that these channels are
intended for permanent connection to
hazardous voltage circuits. Connection of
these channels to voltages greater than
30 V ac or 60 V dc violates electrical safety
code requirements and may expose users to
electric shock.
Input Channels
INPUT
4 isolated and independent channels
INPUT RANGE (EACH CHANNEL)
0 to 20.4 mA dc
ACCURACY
±0.05% of span
COMMUNICATION
Via a redundant Fieldbus
INPUT CONNECTIONS
Two configurations (see Figure 1)
CONVERSION TIME (SOFTWARE
CONFIGURABLE)
See Table 1 (Input Specifications)
Output Channels
OUTPUT
4 isolated and independent channels
OUTPUT RANGE (EACH CHANNEL)
0 to 20.4 mA dc
OUTPUT LOAD (MAXIMUM)
735 Ω
COMPLIANCE VOLTAGE
18.6 V nominal at 20 mA dc at I/O field terminals
ACCURACY
±0.05% of span (25°C)
OUTPUT TEMPERATURE COEFFICIENT
100 ppm/°C
COMMUNICATION
Via a redundant Fieldbus
SETTLING TIME
100 ms to settle within a 1% band of steady state
for a 10 to 90% input step change.
LINEARITY ERROR
±0.025% of span (monotonic)
RESOLUTION
12 bits