Foxboro RH914YZ FCM2F2 I/a Series Fiber Optic Fieldbus Extender Module

OVERVIEW

Plant installation costs can be significantly reduced by placing the rugged standard 200 Series Foxboro™ DCS Fieldbus Modules (FBMs) much closer to their corresponding field devices. Long runs of signal cables can then be replaced by one or two fiber optic pairs carrying multiplexed I/O signals. The 200 Series Fieldbus Communications Modules (FCMs) support this capability over nominal distances of 2, 4, or 10 kilometers.

FCMs are fiber optic communications extenders that permit 200 Series FBMs to be installed remotely and closely to the plant processes.

The three versions, FCM2F2 (RH914YZ), FCM2F4 (RH917JA), and FCM2F10 (RH916TQ), offer nominally maximum baseplate-to-baseplate fiber optic cabling distances: up to 2 km (1.24 mi), up to 4 km (2.48 mi), and up to 10 km (6.21 mi), respectively.

The FCMs are mounted on standard baseplates in pairs for redundancy. Nonredundant configurations require only a single FCM.

Unaffected by electrical noise (EMI, RFI, and lightning), fiber optic cabling provides a versatile means of extending signal communications. It can be used in areas containing rotating machinery, arc welders, and so forth, and can be installed in cable trays containing high voltage power lines, or in outdoor areas exposed to lightning hazards. Its electrical isolation characteristics provide protection from voltage differentials and ground loops.

Figure 1 shows an example of redundant configuration with baseplates (containing FCMs) linked point-to-point with fiber optic cabling. This cabling configuration shows a single fiber optic segment, interconnecting two baseplates. However, up to three fiber optic segments can be used to interconnect the (maximum) four baseplates.

Maximum fiber optic cabling distance between any two baseplates is 10 km (using FCM2F10s (RH916TQ)), with the total fiber optic cabling distance between the baseplates (all cable segments) not to exceed 20 km (10.42 mi).

FEATURES

• Converts 2 MB HDLC Fieldbus to MMF or SMF fiber optics

• Rugged design suitable for enclosure in Class G3 (harsh) environments

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