Rockwell Automation Chassis Models User Manual
Triguard SC300E
Chassis Models
Chassis Models
Issue 4
INTRODUCTION
PURPOSE
The chassis accommodates the various system modules and their power supplies. It
comprises a 9U standard 19 inch rack mounting module cage and a printed circuit backplane.
NOTE
A ‘U’ is one unit an
equipment cabinet manufacturers as a measure of height for rack systems.
d measures 44mm (1.75 inches). The ‘U’ is an industry standard and used by
October 2005
The modules and power supplies plug into connectors on the front of the backplane. External
power and signa
Figure 2-1).
The same basic chassis is configured as a main chassis or an extension chassis by the type
of module fitted in slots A, B and C. A keying system prevents the insertion of Power Supply
Units (PSUs) of the wrong voltage type.
l connections are made via connectors on the rear of the backplane (see
SC300E SYSTEM OVERVIEW
The SC300E is a cost effective, fault tolerant control system suitable for use in industrial
situations where the control system's reliability, availability and predictable perfor
paramount importance. The SC300E is certified for use in safety applications, such as fire and
gas detection/protection and process emergency shutdown, as well as sequence and batch
process control.
mance is of
ARCHITECTURE
The two key components of the SC300E, that permit system’s availability in excess of
99.999% (about 1 hour’s downtime in 11 years) to be realised, are:
• Triple Modular Redundant architecture -
• Software Implemented Fault Tolerance -
TMR
SIFT
008-5097
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Figure 1-1. SC300E Architecture
As can be
architecture from input modules to output modules. All SC300E input and output modules
interface to three isolated I/O communications buses, each being controlled by one of the three
main
At the input modules, field signals are filtered and then split, via isolating circuitry, into three
identical, signal processing paths. Each path is controlled by a microcontroller that co
ordinates signal path proc
processor, via one of the I/O communications buses.
Each of the main processors communicates with its neighbours via read only, serial
communications links. The main processors synchronise at least once per application logic
execution cycle, and each reads the input, output and diagnostic status of its neighbours.
Each processor correlates and corrects its memory image of the current state of the system
using a 2-oo-3 software vote, logging any discrepancies found in a local diagnostic history
table.
Each processor then executes its programmed application logic and sets its respective
outputs, via the I/O communications bus, to the required state.
seen from the block diagram in Figure 1-1 a SC300E system has a fully triplicated
processor modules.
essing, testing and signal status reporting to its respective main
-
Commanded output states are received by an output module’s microcontrollers which, using 2
oo-3 hardware voters, set the outputs to the field. Any discrepancy between a commanded
output
state and the field output is detected by the microcontrollers and reported to the
appropriate main processor.
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SC300E Chassis Models
All input and output modules can be configured to use a hot spare partner module. In the event
of failure of the main I/O module its duty is taken over (manually or automatically) by the hot
spare
partner, allowing repairs to be effected
.
HARDWARE
The system
can
be
comprises a main chassis and up to 14 extension chassis (of which 11 can be re
chassis,
using a multi-drop technique. Each chassis can accommodate up to 10 I/O modules so that a
fully
populated SC300E system can contain 150 I/O modules.
Blanking plates
Unpopulated slots can be covered with blanking plates if required.
circuits are accommodated mainly within a number of identical box chassis which
individually configured and interconnected to form the required system layout. A system
mote
connected via fibre optic cables) interconnected via a set of standard ribbon cables
Figure 1-2. Fully loaded chassis
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Figure 1-3. Chassis front view
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Figure 1-4. Chassis rear view
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Figure 1-5. Chassis rear view showing cabling arrangement
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F
igure 1-6. Chassis interconnections for system layout with remote chassis
SC300E Chassis Models
CHASSIS TECHNICAL DATA
The chassis variants covered by this document differ only in the basic equipment (excluding I/O
modules) fitted into them and whether they can be powered from 110/230Vac or 24Vdc. Table
1-1 lists the details of each variant.
Type No
CXP10A11
CXP10D24
CXB10A11
Type
Main
Main
Extension
Table 1-1. Chassis variants
110/230Vac
24Vdc
110/230Vac
Power
Equipment fitted
3 Processors
2 Power Supplies
3 Processors
2 Power Supplies
3 Bus Extenders
2 Power Supplies
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