AC 800M High Integrity Section 1 Introduction
50 3BSE036351-510 A
The following characteristics of the MAC and IP address handling should be
considered in order to avoid network problems while reusing previously used CPU
modules within the same plant:
• The stored swap addresses will be remembered until erased by an IP-config
session (Restore factory settings) or until started up as a backup CPU in new
context (in this case a new swap will take place).
• A CPU running in standalone mode (with RCU terminator fitted) will always
use its own native addresses.
AC 800M High Integrity
AC 800M can easily be configured for usage in safety critical applications. The
main components of such a system are PM865, SM810/SM811, SS823 and the
S800 I/O High Integrity, running a High Integrity version of Control Software. The
PM865 processor unit has increased internal diagnostics, compared to PM864. The
added functionality on PM865 includes:
• Double over voltage protection on internal voltages
• A additional watchdog timer updated with data from SM810/SM811
• Increased oscillator supervision
• Support for S800 I/O High Integrity
• Support for SM810/SM811
• Increased system diagnostic and online self tests.
The main function of the SM810 is to act as a monitor for the HW and SW
execution of PM865 and these two modules together are a SIL2 compliant system
according to IEC61508, certified by TÜV. The SM810 is running a SIL3 certified
operating system and have a high degree of self-diagnostic including, for example:
• Double and inverted memory
• Double over voltage protection on internal voltages
• Two independent watchdog timers
The following CEX modules cannot be used in a High Integrity controller:
CI851, CI852, CI858, CI860, CI862 and CI865.
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