F8620/11 These essential functions are
– two clock-synchronised micro processors
– each mikroprocessor with an own memory, one processor operates with real data and program and the F8620/11 other one with inverted data and program
– testable hardware comparer for all the external accesses of both micro processors, in case of a fault the watch dog will be set to the safe status and the status of the processor is announced
– Flash-EPROMs of the program memory for the operating system and the user’s program usable for min. 100.000 writing cycles
– Data memory in sRAM
– Multiplexer to connect I/O bus, DPR and redundant CU
– Battery backup of the sRAMs via batteries on the central module with monitoring
– 2 interfaces RS 485 with galvanic isolation F8620/11 . Transm. rate: max. 57600 bps. Set to 9600 bps and to 57600 bps by switch, or setting also of other transm. rates by software (the software values have priority)
– Diagnostic display and 2 LEDs for information out of the system, I/O level and user’s program
– Dual Port RAM for fast memory access to the second central module
– hardware clock, battery backed
– I/O bus logic and connection to the input-/output modules
– Fail-safe watchdog
– power supply monitoring, testable (5 V system voltage)
– Battery monitoring
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