Foxboro Compact FBM240 Output and Input Module

Foxboro Compact FBM240 Output and  Input Module

DESCRIPTION

The Compact FBM240 is 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 common termination 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 FBM output 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: 

◦ 10 A at 80 to 120 V ac, or 

◦ 5 A at 80 to 125 V dc, or 

◦ 5 A at 15 to 30 V dc, or 

◦ 5 A at 80 to 120 V ac 

• Supports channel-isolated discrete I/O: 

◦ 15-60 V dc @ 2 A, fused outputs 

◦ 15-60 V dc inputs 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. 

• Redundant operation failure detection 

◦ Output contact 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 

◦ Output Channel is marked BAD in both Single and Redundant Operation if the demand state read-back indicates a state of miss-compar

Fail-Safe

Configurable options for output safety include: 

• Digital Output Fail-Safe Fallback Data - specifies the channel fallback value (0 or 1) for each of the eight digital outputs 

• Mask option - determines which of the eight digital outputs hold its current value and which outputs assume the fallback values 

• Fieldbus Fail-Safe Delay Time - length of time the FBM waits for a communication from the CP before entering a communications fail

Termination Assemblies

Field I/O signals connect to the FBM subsystem via DIN rail mounted termination assemblies (TAs). The TAs used with the Compact FBM240 provide: 

• Output signal connection points 

• External power connection point 

• 5 A unsealed relay or a 10 A unsealed relay for each output 

• 15-60 V dc switch and voltage monitor inputs

Functional Specifications

Voltage Monitor Function (with TA (RH916AQ/ RH916AR))

• Input: 

◦ On-State Voltage: 15 to 60 V dc 

◦ Off-State Voltage: 0 to 5 V dc 

◦ Current: (Single module) 1.4 mA (typical) at 5 to 60 V dc (Redundant modules) 2.8 mA (typical) at 5 to 60 V dc 

• Source Resistance Limits: 

◦ On-State: 1 kΩ (maximum) at 15 V dc 

◦ Off-State: 100 kΩ (minimum) at 60 V dc

Output Switch with External Source

• Applied Voltage: 60 V dc (maximum) 

• Load Current: 2.0 A (maximum) 

• Off-State Leakage Current: 0.1 mA (maximum)