GE Centiva/5 Plus, Technical Reference Manual

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2 Theory of operation
TRM, Centiva/5 Plus, M1047448/CM-922026, rev. 3.50.a of 11/05 2-8
On board power supply micro B
Input micro B
Output micro B
Safety
The main board B creates three bus supplies by a +13 V bus (EB P07) via a bus
fuse (SI 26), a +15V bus (EB P08) via a bus fuse (SI 27) and a +5 V bus (EB P09)
via a bus fuse (SI 28). For analog OP Amps a symme- 12 V supply is created
by EB P08.
The alarm system (EB S15), the fan (EB S10) and the control panel are supplied by
an OR from both +13V and +15V supply lines.
The watchdog (EB S02) controls the +13V (EBP30) and +15V (EBP31) power
supply of the safety functions of valve supply etc. In case of a detected malfunction
of one or both of the microprocessors the watchdog is able to move the system into
a fail-safe status by turning off the bus supplies.
The following control sensors talk to the micro B.
-
EB P11, EB P12, EBP13
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EB M00, EB P00, EB P10
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EB S11, EB S16, EB S20
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EB E11, EB E12
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EB M01, EB M06, EB E01, EB M11
-
Data input from micro A is received via the internal serial port (EB S01, EB
S03
Micro B talks to the following actors
-
EB M02, EB M07, EB E02, EB M12, EB S25
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EB M03, EB M08, EB E03, EB E05
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EB M20, EB M21, EB M22
-
Data output to micro A is made via the internal serial port (EB S01, EB
S03, EB S04)
-
Data output to a serial communication ports is made via galvanic isolators
EB S30, EB P25 und SI 29.
-
Data output to a nurse call system port is made via galvanic isolators EB
S35.
-
Data output to the watchdog EB204.
Micro B talks to the watchdog system (EB S02 on PC board B, enabling micro A to
react in case of a malfunction of micro B and to allow the watchdog to shut down
the system. The watchdog has access to the audible alarm too.