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8-Channel HART Analog Input MTA
Marshalled Termination Assemblies for ET200M Remote I/O Modules
254
A5E00482820-12
20.3
Operation
Power is supplied via a removable power connector marked
L+A
,
MA
,
L+B
, and
MB
. There is circuitry to detect the presence of voltage over 15 VDC and turn on
the LED indicator. The LEDs are marked
A POWER
and
B POWER.
There is also
a connector for a Power Monitor board used to indicate the presence of both A and
B power. See section 16 Power Monitor Board (6ES7650-1BA02-0XX0).
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 ORing diode is sent to the I/O
modules via the module fuses.
Field Terminals, C (
Ix+
), Channel – (
Ix
-
)
, Sensor power (
PWRx
) and
Shield (
SHx
), connect to the field devices.
PWRx
is the +24 VDC power source
and is current limited to about 40- 60 mA on a channel-by-channel basis. The field
termination connector is removable for ease of wiring maintenance and is retained
by friction.
The channel inputs from the MTA connect to the I/O modules inputs via D25
connectors (item 4 in figure 17.1). Redundant operation uses two modules, while
non-redundant systems have one module connected to either I/O module
connector.
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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