Operating System; Off-Line/Start-Up Diagnostics; Figure 1 System Overview - ABB Triguard SC300E Safety Manual

INPUT
TERMINATION
2.3.3

Operating System

The SC300E's Real Time Task Supervisor (RTTS) is a derivative of the CS300 series operating
system that has accrued over 10 million operational hours.
The RTTS is transparent to a user - an SC300E system is programmed like any standard
industrial PLC, and controls the offline/start-up and online/continuous diagnostics.
2.3.4

Off-Line/Start-up Diagnostics

When an SC300E's processors are first powered up, the following diagnostic routines are
executed: -
•
•
•
•
•
•
•
A processor will then pause, waiting for the other two processors to complete their start-up
diagnostics.
At power up an SC300E system must have three healthy processors, otherwise the start-up
diagnostics will prevent execution of the system application logic. The RTTS permits an SC300E
system to operate 3-2-0 i.e. a system will continue to operate with one failed processor. For
ESD safety configurations output modules are configured to de-energise their outputs when the
second processor fails.
Replacement processors can be brought online using a warm start command. Warm start
commands can be issued from a TriBuild workstation or by use of application logic. A newly
installed processor will execute its start-up diagnostics, monitor the running processors'
synchronisation registers and await a warm start command. At this point checksums will be
confirmed and the new processor acquires I/O data tables and the application program from its
neighbours and commences execution of its application logic.
Issue 5 - September 2006
HOT REPAIR MODULE
R/O=Read-Only Links
INPUT MODULE
MICRO
CONTROLLER
I/P PATH A
R/O
MICRO
CONTROLLER
I/P PATH B
R/O
MICRO
CONTROLLER
I/P PATH C

Figure 1 System Overview

initialisation of all RAM
memory configuration and size checks
RTTS and application logic copied to RAM
all program checksums recalculated and checked
configuration and checksums of neighbouring processors read and
confirmed
initialisation of synchronisation registers
synchronisation registers of neighbouring processors read and verified
HOT REPAIR MODULE
OUTPUT MODULE
PROCESSOR MICRO
A CONTROLLER
O/P PATH A
R/O
R/O
PROCESSOR MICRO
B CONTROLLER
O/P PATH B
R/O
R/O
PROCESSOR MICRO
C CONTROLLER
O/P PATH C
OUTPUT
TERMINATION
VOTER
2 oo 3
Page 10 of 65