Product introduction：

The Compact FBM240is an 8 channel input and 8 channel output Foxboro™ DCS
Fieldbus Module (FBM) available as a single or redundant module. A redundant pair
of the modules combine to provide redundancy at the FBM level, with field I/O wired to
one commontermination assembly (see Figure 1). Each module independently holds
the output(s) at its specified output value(s), and each independently reads back its
observed value of the output.

This module is part of the Compact 200 Series I/O subsystem described in Compact
200 Series I/O Subsystem Overview (PSS 41H-2COV).

Features
• Eight discrete outputs/Eight discrete voltage monitor inputs
• Eight discrete inputs read back the voltage across the relay contacts. Sets the
channel BAD if the state of the contact disagrees with the state of the
corresponding output channel
• Monitors each FBMoutput and sets the output channel BAD if the output is in the
wrong state
• Single or redundant module
• Termination Assemblies (TAs) for locally or remotely connecting field wiring to the
Compact FBM240
• Supports discrete relay outputs capable of switching:
◦ 10Aat80to120Vac,or
◦ 5Aat80to125Vdc,or
◦ 5Aat15to30Vdc,or
◦ 5Aat80to120Vac
• Supports channel-isolated discrete I/O:
◦ 15-60Vdc@2A,fusedoutputs
◦ 15-60Vdcinputs

FBM240

NOTE: Support for this termination assembly and the new Fail-Safe
configuration options described in Fail-Safe, page 6 require version 1.40N or
later firmware.
• Redundantoperation failure detection
◦ Outputcontact monitor readback and high coverage of internal FBM detected
failures allows redundant partner to automatically continue to drive discrete
outputs and to monitor inputs
• Internal per channel output demand state failure detection
◦ OutputChannel is marked BAD in both Single and Redundant Operation if the
demand state read-back indicates a state of miss-compare

Internal Readback of Output
The Compact FBM240has8internal readback channels, one per each output
channel, used to verify that the output has changed to the requested state. These
channels read the voltage across the relay contacts on the relay termination
assemblies. The states of these channels are displayed on LEDs on the front panel of
the Compact FBM240. When external power is applied to the relay contact of each
channel, the LED for that channel is ON when the relay contact is CLOSED, and OFF
when the relay contact is OPEN. If the state of the contact disagrees with the state of
the corresponding output channel, the channel is marked BAD.
The FBMalso monitors each of its eight outputs and sets the corresponding output
channel BAD if the output is in the wrong state.
If the channel or input power is marked BAD, the CP presents that information to the
Foxboro DCS for display as a System Management alarm and as a control block
alarm

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