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An optional dual cable baseplate is available that supports four PIO channels, but separate A versus B bus connectors are provided along with dedicated connectors for the optional Time Strobe inputs. Fieldbus connections from the optional dual cable baseplate to standard or compact 200 Series FBMs require separate A versus B bus cables plus a dual “D” connection adapter on the FBM baseplate (RH926KW). The number of FBMs that an FCP280 can support varies depending on the types of FBMs used: • 200 Series FBMs exclusively used with FCP280 - Each Fieldbus port on the FCP280 baseplate can connect to a baseplate chain with up to 32 Compact or standard 200 Series FBMs per chain via the 2 Mbps HDLC fieldbus for up to 128 modules. • 200 Series and 100 Series FBMs (dual baud configurations) used with FCP280. The FCP280 can support a total of 128 100 Series FBMs (Y-module) or competitive devices (such as Foxboro DCS system migration FBMs) in one or more baseplate chains, with the remainder of the FCP280’s 128 module limit being 200 Series FBMs, depending on the Fieldbus loading of the FCP280. For example, an FCP280 could support 64 100 Series FBMs and 64 200 Series FBMs (as 64 + 64 = 128). Main and expansion FBMs are considered as two FBMs for counting purposes. As well, no more than 64 100 Series FBMs are allowed on each PIO bus/baseplate port. See the next two figures. NOTE: Certain competitive migration or supported third-party modules such as the EcoStruxure Foxboro DCS Process Automation System Migration Fieldbus Modules and Pepperl+Fuchs™ I/O modules may increase this 128 module maximum per FCP280. For the maximum numbers of each of these migration/ third-party modules supported by the FCP280, see the supported migration products books in Field Control Processor 280 (FCP280) User’s Guide (B0700FW). NOTE: The dual cable baseplate does not support connections to 100 Series FBMs or equivalent competitive migration and third-party modules. NOTE: Although the FCP280 is capable of communicating with the maximum number of FBMs (128), some restrictions may constrain a useful control system's design, thereby limiting the number of FBMs that can be installed.
When supporting 200 Series and 100 Series FBMs, each Fieldbus port (PIO channel) is dedicated to supporting either a 268 Kbps HDLC fieldbus (for 100 Series FBMs) or a 2 Mbps HDLC fieldbus (for 200 Series FBMs) — not both. For connections to 100 Series FBMs, an FBI200 pair is required to extend communications up to 1,830 m (6,000 ft). See the next figure. NOTE: When replacing a CP10, CP30, CP40, or CP60 with a FCP280 and keeping all its 100 Series FBMs, an FBI200 is required to be installed between the CP and FBMs to reduce potential system messages. The Fieldbus splitter (RH928CV) is used to directly connect a Fieldbus port to a 268 Kbps HDLC fieldbus. This provides a connector for any Fieldbus port on the FCP280 baseplate, and two Termination Cable Assembly (TCA) termination blocks for the twinaxial cabling from the 100 Series FBMs. The FCP280 can also communicate with serial and Ethernet devices, such as PLCs, via Field Device System Integrators (special FBMs). This allows you to connect to new device interfaces without any changes to the controller software. To estimate the FCP280’s processor load, see Field Control Processor 280 (FCP280) Sizing Guidelines and Excel Workbook (B0700FY). For a description of the FCP280 baseplates, see Standard 200 Series Baseplates (PSS 41H-2SBASPLT).