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FEM100 MODULE DESIGN FEM100 modules have a compact design, with a rugged extruded aluminum exterior for physical protection of the electronics. Enclosures specially designed for mounting of DIN rail mounted Fieldbus equipment provide various levels of environmental protection for the FEM100 modules, up to harsh environments per ISA Standard S71.04. The FEM100 can be removed/replaced from an Expansion Baseplate without removing power. Lightemitting diodes (LEDs) incorporated into the front of the FEM100 indicate module Fieldbus communications activity and module status. The FEM100 communicates to the FCP270 over the 2 Mbps HDLC Fieldbus, as shown in Figure 3 on page 5. HIGH AVAILABILITY A pair of FEM100 modules provides redundancy for the Extended Fieldbuses to maintain very high subsystem availability. When both modules are active, the FCP270 sends and receives communications across both A and B buses. In the case of a FEM100 module failure, the FCP270 switches all traffic to the bus with the available FEM100 module until the failed module is replaced. Either module may be replaced without upsetting input or output communications to the other module. EXPANSION BASEPLATE MOUNTING The FEM100 modules mount on either the Two-Slot or Four-Slot Expansion Baseplate. These baseplates are DIN rail mounted and vertically oriented only. These baseplates include signal connectors for the FEM100s, redundant independent dc power connections, and four cable connections to the 2 Mbps HDLC Expanded Fieldbuses. The Two-Slot Expansion Baseplate includes a redundant I/O cable connection to the FCP270s. One connector supports both A and B buses, while the other is terminated. Alternatively, both connectors can be used in conjunction with a Fieldbus Splitter/Terminator (RH926KW (supersedes P0926KW)). The Four-Slot Expansion Baseplate includes two slots for mounting a fault-tolerant pair of FCP270s and their fiber optic splitter/combiners. For more information on these baseplates, refer to Standard 200 Series Baseplates (PSS 31H-2SBASPLT). MODULE FIELDBUS COMMUNICATION The Expansion Baseplates support the 2 Mbps module Fieldbus. They connect to the 2 Mbps module Fieldbus for communication to all 200 Series I/O FBMs, the Siemens APACS+™ and Westinghouse competitive migration modules (see “DEVICES SUPPORTED” on page 7). The 2 Mbps module Fieldbus is redundant and all 200 Series modules can receive/transmit messages over both A and B buses.