Foxboro Invensys P0902XB FBM42 Module Contact VDC Input/Output

Fieldbus Modules provide the interface between process sensors/actuators and the redundant Fieldbus. The modules appropriately convert the electrical input/output signals used by field devices to permit communication with these devices via the

Fieldbus. The Fieldbus Modules available for use with I/A Series systems are partitioned into three categories; main modules, expandable main modules, and expansion modules.

Main Modules

Each main module independently connects to the Fieldbus, has a fixed (that is, non-expandable) capacity of field input/output channels, and performs the signal conversions and other related operational executions required for these resident input/output channels. All main modules contain the following:

Digital processor

Dual transceivers (for Fieldbus communications)

Memory

dc/dc power converter (accepts redundant power inputs)

Security logic

Power security and on-line self-check circuits.

Input Signal:

When replacing an expansion FBM42A to FBM219: 8 channel Voltage

Monitor external source 60 V dc

Maximum voltage

Logic Zero: 0 to 5 V dc

Logic One: 15 to 60 V dc 6 mA maximum input current

1 KΩ Maximum On-state resistance

100 KΩ Minimum Offstate resistance

When replacing an expansion FBM42C to FBM219:

Contact sense internal source

24 V dc ±20% Open circuit voltage

5 mA maximum short circuit current

1 KΩ Maximum On-state resistance

100 KΩ Minimum Offstate resistance

Output Signal

When replacing an expansion FBM42A/C to FBM219:

8 channel Output

Switch external source

60 V dc Maximum voltage

0.4 V maximum

voltage drop @ 1 A

2.25 A maximum current

12 A maximum current per TA

10 A surge current limit for 20 msec maximum

Shorted load duration: indefinite (duty-cycle limited)

0.5 mA maximum off-state leakage

PA: P0924JB

Fieldbus Modules