3 - 10 WBPEEUI240751C0
I/O Block
their presence or absence. The circuits do not test the inputs
for voltage range.
The power monitor circuits also test and report status for the
internal field power (IFP) or external local field power (LFP)
input depending on the field power select jumper setting.
Again, the circuits only test for the presence or absence of the
field power input.
The I/O block will generate an SOA alarm if the fuse for any of
these inputs is bad or if the input voltage is absent.
Refer to the Block Power and Mounting Hardware
Block Power and Mounting HardwareBlock Power and Mounting Hardware
Block Power and Mounting Hardware instruction
for a complete explanation of BLP, IFP, and LFP power, and the
SOA alarm signal for power status monitoring.
Central Processing Unit
The central processing unit (CPU) contains a microprocessor
and its supporting circuitry. The CPU interprets and executes
instructions to control the I/O block functions. Its responsibil-
ities include executing the I/O block portion of the control con-
figuration and controlling:
• Hnet communication.
• Analog and digital I/O processing.
• Redundancy or station link communication.
• Block diagnostics.
Figure 3-8. Block Power
POWER
AUCT ION EER
POWER
FILTER
POWER
MONITOR
FIELD POWER
SELECT
5VDC
POWER
REGULATOR
15 VDC
POWER
REGULATOR
+24 VDC +24 VDC
SOA
ALARM
POWER
STATUS
FIELD
POWER
BLOCK
POWER
+15 VDC
+5 VDC
–15 VDC
IF P /L F P
BLP B
BLP A
IF P
LFP
+24 VD C
FRO M
MOUNTING
COLUMN
T00560B
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