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6-Channel F Analog Input HART MTA
Marshalled Termination Assemblies for ET200M Remote I/O Modules
118
A5E00482820-12
10.3
Operation
The Fail-Safe Analog Input HART (FAIH) MTA consists of the
•
Main board
•
Two diode boards
The diode board marked
1
(MLFB 6ES7650-1BC51-0XX0 or 6ES7650-1BC50-
0XX0 ) uses 6.2 VDC zener diodes. The diode board marked
2
(MLFB 6ES7650-
1BB51-0XX0 or 6ES7650-1BB50-0XX0) uses 5.6 VDC zener diodes. The two
diode boards make maintenance of redundant modules possible. The diode boards
plug in to the main board and can be removed for testing and maintenance without
affecting operation of the input module.
Power is supplied via the two removable power connectors which are retained by
screws and marked
L+A
,
MA
, and
L+B
,
MB
. Each has a LED to indicate the
presence of voltage over 15 VDC. The LEDs are marked
A POWER
and
B
POWER
. There is also a connector (
J3
) for a Power Monitor board used to indicate
the presence of both A and B power. See Section 19,
Power Monitor Board
(6ES7650-1BA02-0XX0).
Incoming power from
A
and
B
is diode OR’d, in
CR106
, to provide the MTA and
the module power from either input source. The output from
CR106
is sent to the
I/O modules via the module fuses and to the channels via the channel fuses.
Module Fuse 1 (
F100
) supplies the I/O Module plugged into
J1
and Module Fuse 2
(
F101
) supplies power to the I/O Module plugged into
J2
.
Each channel has an LED to indicate the presence of power and the fuse status. If
there is no power or the fuse is open, then the LED remains off. If there is power
and the fuse is good, then the LED is illuminated.
Field Terminals, C (
Ix+)
, Channel – (
Ix
-
)
, Sensor power (
PWRx
) and
Shield (
SHx
), connect to the field devices.
PWRx
is the +24 VDC power feed and
is fused on a channel-by-channel basis. The field termination connector is
removable for ease of wiring maintenance and is retained by friction.
For redundant I/O Modules, the
Ix-
connects to the I/O modules input via
J1
and
J2
. If both modules are present, then the diodes on boards
1
and
2
are passive,
but ensure that if either module is removed for maintenance, the input signals to
the remaining module are not interrupted. Redundant operation uses the MTA, two
zener diode boards, and two FAI modules. A simplified diagram of redundant use
of the FAI module and MTA is shown in Figure 10–1
For a non-redundant I/O module, the
Ix-
connects to the I/O module input via the
diodes on Diode Board
1
. The diodes on Diode Board
1
conduct the signal to the
non-redundant module plugged into
J2
. In this case the diodes on board
2
are
passive. Non-redundant modules could be plugged into
J1
or
J2
. Non-redundant
operation uses the MTA, two Zener Diode Boards, and the FAI module. A
simplified diagram of Non-redundant use of the FAI module and MTA is shown in
Note
Use of the FAIH MTA for non-redundant operation requires that the FAI I/O to
MTA cable be installed into
J2
on the MTA.
Summary of Contents for ET 200M
Page 8: ...Preface Marshalled Termination Assemblies for ET200M Remote I O Modules 8 A5E00482820 12 ...
Page 16: ...Contents Marshalled Termination Assemblies for ET200M Remote I O Modules 16 A5E00482820 12 ...
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