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6-Channel F Analog Input HART MTA
Marshalled Termination Assemblies for ET200M Remote I/O Modules
138
A5E00482820-12
11.4
Operation
Power is supplied via the two power connectors which are marked
L/A+
,
M/A
, and
L/B+
,
M/B
. Each has a green LED to indicate the presence of voltage over 15
VDC. The case of polarity reversal of the power supply is indicated by the LEDs
illuminating red. The LEDs are marked
A POWER
and
B POWER
.
Incoming power from
A
and
B
is diode OR’d to provide the MTA and the module
power from either input source. The output from the diodes is sent to the I/O
modules via the module fuses and to the channels via the transducer supplies.
Module Fuse F110 (
MODULE 1
) supplies the I/O Module plugged into
MODULE 1
and Module Fuse F160
(MODULE 2
) supplies power to the I/O Module plugged
into
MODULE 2
.
An onboard Power Monitor System (PMS) is used to provide an isolated dry
contact when redundant power is supplied to MTAs. Only when power is supplied
to both power inputs the output contacts
1
and
2
are closed. The Power Monitor
System is designed to detect only the presence or absence of power. It is not
designed to detect supply voltage which is outside the specification threshold.
Field Terminals, C (
Ix+)
, Channel – (
Ix
-
)
, Transducer power (
PWx
) and
Shield (
SHx
), connect to the field devices.
PWx
is the +24 VDC power feed for
supplying 2-wire transducer and is short circuit proofed on a channel-by-channel
basis.
For redundant I/O Modules, the
Ix+/-
connects to the I/O modules input via
MODULE 1
and
MODULE 2
. If both modules are present, then the Zener-diodes
which are in parallel to the measuring inputs are passive, but ensure that if one
module is removed for maintenance, the input signals to the remaining module are
not interrupted. Redundant operation uses the MTA 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
upper diodes. These diodes conduct the signal to the non-redundant module
plugged into
MODULE 2
. In this case the lower diodes are passive. Non-redundant
modules could be plugged into
MODULE 1
or
MODULE 2
. Non-redundant
operation uses the MTA and one FAI module. A simplified diagram of Non-
redundant use of the FAI module and MTA is shown in Figure 10–2.
Содержание ET 200M
Страница 8: ...Preface Marshalled Termination Assemblies for ET200M Remote I O Modules 8 A5E00482820 12 ...
Страница 16: ...Contents Marshalled Termination Assemblies for ET200M Remote I O Modules 16 A5E00482820 12 ...
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Страница 78: ...8 Channel RTD Input MTA Marshalled Termination Assemblies for ET200M Remote I O Modules 78 A5E00482820 12 ...
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Страница 154: ...6 Channel F Analog Input HART MTA Marshalled Termination Assemblies for ET200M Remote I O Modules 154 A5E00482820 12 ...
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Страница 270: ...8 Channel HART Analog Output MTA Marshalled Termination Assemblies for ET200M Remote I O Modules 270 A5E00482820 12 ...
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Страница 284: ...Safety Information for US Customers Marshalled Termination Assemblies for ET200M Remote I O Modules 284 A5E00482820 12 ...