maxPAC Hardware Reference Guide
Metso Automation MAX Controls Inc. • 277596 •
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B
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B
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Transmitter
Receiver
Receiver
Transmitte
r
Fiber
Fiber
OUT/IN
DATA
ADDR
LO/HI
LATCH
ACK
DATA[8..0]
ALT_IN
XACK
Remote
564 Bus
INT
Primary
DPU
ALT_IN
Secondary
DPU
OUT/IN
DATA
ADDR
LO/HI
LATCH
ACK
DATA[8..0]
ALT_IN
XACK
INT
B
u
f
f
e
r
s
OUT/IN
DATA
ADDR
LO/HI
LATCH
ACK
DATA[8..0]
XACK
INT
Transmitter
Receiver
Redundant
Fiber Optic
Transceiver
Receiver
Transmitter
Fiber
Fiber
Local Area Remote area
Redundant
Fiber Optic
Transceiver
Redundant
Fiber Optic
Transceiver
Redundant
Fiber Optic
Transceiver
M
A
C
K
M
A
C
K
M
A
C
K
M
A
C
K
Local Bus
Expanders
Remote Bus
Expanders
CPLD
CPLD
CPLD
CPLD
Status
Status
Figure 10-3. BEM Functional Block Diagram
Optical Transceivers – Convert the TTL level transmit serial data into an
optical signal and the received optical signal into a TTL level serial data. A
second transceiver supports redundant links for single DPU applications.
The transmitter/receiver chip pair detects the operational state of the active
link.