Foxboro Migration with FCP280 and DCS FBMs

APACS+ Subsystems

An FCP280. FCP270 or FCM100Et/FCM100E

baseplate is installed in the MODULPAC enclosure

with single or redundant modules. The baseplate has

a built-in Fieldbus termination assembly. The

I/O module power supplies and MODULRACs are

retained in the cabinet.

The MODULRACS, used to house I/O modules, are

reused to house the DCS FBMs. All termination

assemblies in the local, adjacent, and remotely

marshalled MODULPACs remain intact with their

termination cables and field wiring.

APACS+ I/O modules are removed from the

MODULRAC and replaced by a corresponding DCS

FBM that mates to the original power/signal

connector and termination cable connector on the

back of the MODULRAC. This DCS FBM provides

original I/O functionality of the process inputs and

outputs.

Ladder Logic Implementation

Ladder logic for an APACS+ system is implemented

in the ACM controllers, not in the I/O modules. Thus,

any digital I/O point in the system can be used as an

input or output to the ladder logic running in the

ACM. A similar capability exists with the migrated

APACS+ system through the use of sequence control

logic in the FCP280. FCP270 or ZCP270 Control

Processor.

Foxboro control block ladder logic is implemented by

using a combination of logic which executes directly

in the digital I/O modules and sequence control logic

in the Control Processor. This same capability exists

in the AID115. AID230. AOD115. and ADO125

APACS+ migration modules. The channel

configurable ASAM01. AEAM01. ASDM24 and

ASDM48 I/O modules implement ladder logic only by

using sequence control logic in the Control Processor

similar to the original APACS+ system.

Migration with FCP280 and DCS FBMs

The Field Control Processor 280 (FCP280) is a

distributed, field-mounted controller module that

supports up to 128 DCS FBMs - 32 per HDLC

fieldbus. The FCP280 connects to the control

network via optionally redundant 100 Mbps Ethernet

fiber optic cables and Ethernet fiber switches. The

FCP280 is an optionally fault-tolerant controller that

communicates with connected DCS FBMs to

perform data acquisition and control using Foxboro

Evo control algorithms.

The FCP280 mounts in a 2-position baseplate that

supports a single module or a fault-tolerant module

pair. The baseplate accepts only FCP280 modules.

The FCP280 connects to an optionally redundant

2 Mbps HDLC I/O Fieldbus for communications to

the DCS FBMs and provides galvanic isolation

between the 100 Mbps Ethernet Fieldbus and the

2 Mbps local Fieldbus.

FCP280 modules connect to a pair of copper or fiber

optic network adapters that connect to Ethernet

switches in a redundant control network. The

network adapter pair mounts to the FCP280

baseplate.

To support redundancy, a pair of FCP280s must be

used for each DCS FBM grouping. In non-redundant

configurations, only a single FCP280 is required for

each grouping.

The maximum total cable length for the 2 Mbps

Fieldbus is 60 m (198 ft) within a grouping.

I/O Modules

The DCS FBMs provide advanced 200 Series FBM

technology on an APACS+ module form factor. Each

DCS FBM plugs into the slot used by the replaced

APACS+ module and provides two rear connectors,

one of which mates to a connector on a local field

termination strip on the backplane of the

MODULRAC.

For marshalled termination assembly located in an

adjacent MODULPAC enclosure, the DCS Fieldbus

Module I/O connector mates to a field termination

cable connector mounted on the back of the

MODULRAC.

The following I/O module types are used in the

APACS+ system:

 Analog input module

 Analog multi-range input module

 Analog RTD input module

 Digital input module

 Digital output module

 HART® input module

 HART redundant input module

 Analog/digital/pulse input and analog/digital

output module, configurable point-by-point

 Analog/digital input and analog/digital output

module, configurable point-by-point

 Digital input/output, configurable point-by-point.

Each module type is replaced with an equivalent

Foxboro Evo DCS FBM module. All I/O wiring

connected to the I/O module termination strips

remain in place. Power is derived from the original

rack power supply. Table 1 lists the available DCS

Fieldbus Modules and the APACS+ modules they

replace.