FCM2F2 现场总线通信模块 FCM2F2 / FCM2F4 / FCM2F10

FCM2F2

Plant installation costs can be significantly reduced by placing the rugged standard200 Series Foxboro™ DCS Fieldbus Modules (FBMs) much closer to theircorresponding field devices. Long runs of signal cables can then be replaced by oneor two fiberoptic pairs carrying multiplexed l/O signals. The 200 Seres FieldbusCommunications 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 beinstalled 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 cablingdistances: 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. Non-redundant configurations require only a single FCM.
Unaffected by electrical noise (EMl, RFl, and lightning), fiber optic cabling provides aversatile means of extending signal communications. lt can be used in areascontaining rotating machinery, arc welders, and so forth, and can be installed in cabletrays containing high voltage power lines, or in outdoor areas exposed to lightninghazards. lts electrical isolation characteristics provide protection from voltagedifferentials and ground loops.
Figure 1 shows an example of redundant configuration with baseplates (containingFCMs) linked point-to-point with fiber optic cabling. This cabling configuration shows asingle fiber optic segment, interconnecting two baseplates. However, up to three fiberoptic segments can be used to interconnect the (maximum) four baseplates.
Maximum fiber optic cabling distance between any two baseplates is 10 km (usingFCM2F10s (RH916TQ)), with the total fiber optic cabling distance between thebaseplates (all cable segments) not to exceed 20 km (10.42 mi).