PSS 21H-1B2 B3
Page 4
All three Fieldbus configurations use serial data
communication complying with Electronic Industrial
Association (EIA) Standard RS-485. The data
transmission rate is 268.75 Kbps.
Panel Display Station Interfacing
The Control Processor 30 achieves the capability to
interface Panel Display Stations when the DSI
(Display Station Interface) block is selected via the
configurator. In this capacity the Control Processor
30
can interface up to 24 Panel Display Stations, or a
combination of Fieldbus modules (which may include
associated Auto/Manual Stations) and Panel Display
Stations mixed on the same Fieldbus. (Note, however,
that per configuration rules, one Panel Display Station
counts as two Fieldbus Modules.)
Control strategy should be planned such that all
blocks involved with the Panel Display Station,
Auto/Manual Station, and the control loops being
monitored or controlled are in the same Control
Processor 30, and ideally in the same compound.
The Control Processor 30 connects to the Panel
Display Stations and Fieldbus Modules via either of
two types of Fieldbus communications media:
twinaxial cable or fiber optic cable.
Figure 4 shows a
typical twinaxial Fieldbus configuration, and Figure 5
shows a typical fiber optic Fieldbus configuration.
(Refer to Fiber Optic Fieldbus Product Specification
Sheet PSS 21H-7P1 B4 for additional fiber optic
Fieldbus application information.)
Cluster I/O Subsystem Interfacing
The Control Processor 30 interfaces with the Fieldbus
Cluster Input/Output Subsystem that consists of the
Fieldbus, a multi-slot chassis configuration of a
Fieldbus Processor (FBP10), analog/digital Fieldbus
Cards (FBCs) and power supply and power monitor
card. These Cluster I/O subsystems meet the needs
of applications where a high number of channels per
card are required.
Figure 6 shows a typical twinaxial
Fieldbus configuration. (Refer to the Fieldbus Cluster
I/O Subsystem PSS 21H-2T1 B3 for additional
information.)
Figure 4. Panel Display Station Interface Configuration using Twinaxial Fieldbus (Typical Configuration)
CONTROL
PROCESSOR
30**
FIELDBUS
ISOLATOR
TCA
TCA
TCA
CB
FBMXX
(1)
PANEL
DISPLAY
STATION
(N + 1)
FBM22
(1)
PLUG
DW OR
PLUG
A/M
STATION
PANEL
DISPLAY
STATION
(24)
FBM22
(24)
PLUG
DW OR
PLUG
A/M
STATION
FBM22
(1)
PLUG
DW OR
PLUG
A/M
STATION
FIELDBUS
ISOLATOR
TO/FROM ACTUATORS
ASSOCIATED WITH
PANEL DISPLAY AND
A/M STATIONS.
TO/FROM
PROCESS DEVICE(S)
TO/FROM
ACTUATOR
TERMINATING
RESISTOR
TERMINATING
RESISTOR
TERMINATING
RESISTOR
FIELDBUS*
ABBREVATIONS:
TCA = Termination Cable Assembly
A/M = Auto/Manual
DW = Discrete - Wire Connector
CB = Coupling Block
* OPTIONALLY REDUNDANT
** OPTIONALLY FAULT-TOLERANT
(7 paginas)
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