F6217 HIMA 5 V DC system power supply

The 5V DC power supply does not have to be wired separately as it is already installed as part of the subrack.
The 5 V DC power is needed by the CPU, the control of the interfaces, and
the I/O modules. It is generated by a clocked 24 V DC/5 V DC power supply module bearing the F 7130A identification. The subrack is equipped
with two power supply modules. The power supply modules are paralleled. If one of them fails, the other supplies the PES.
The 5 V DC output voltage of the power supply modules (for the CPU, I/
O, and the interfaces) are monitored on the central unit checking undervoltage and failure.
In case of a faulty power supply module the operating system supplies the
user’s program via a system variable with this information.
In case the 5 V DC system power fails hardware clock and RAM on the
central module are buffered by a lithium battery which is also on the central unit.
– two clock-synchronised micro processors
– each mikroprocessor with an own memory, one processor operates
with real data and program and the 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 state
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 and on the bus board
– 2 interfaces RS 485 with galvanic isolation. 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)

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