PI-B374-001 Rev B
B374-001 I 4-20
mA, Analog Output Module
DATA SHEET
The B374-001, 4-20 mA Analog Output Module receives numerical values that range from 0 to 999
’ from the Micro 84’” Controller and converts them into two 4-20 mA output currents.
FEATURES
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Two isolated channels
Popular 4-20 mA current outputs
Current sink or source capability
10 bit resolution
Voltage monitor outputs
High accuracy and speed
“Hold last value” or “reset to zero”
user selectable
Optional fanning strip permits module
removal without disturbing field wiring
Designed for harsh industrial
environments
UL listed
GENERAL DESCRIPTION
The B374-001 4-20 mA Analog Output is a
dual channel output module for the Micro
84 Controller. It converts numerical values
that range from 0 to 999 to an output cur-
J rent. This current ranges from 4 mA to 20
mA and is proportional to the input. For ex-
ample, if the numerical input increases 10
percent, the output current also increases
10 percent.
The 8374 is used to interface output regis-
ters with any 4-20 mA analog field device.
Typical registers are timers, counters and
sequencers. Typical analog field devices
are valves, recorders, I/P converters, indi-
cators, and servo controllers. You can con-
nect these field devices to both a power
supply and the B374 without using addi-
tional components. Field devices can be
located several hundred feet from the out-
put module.
Specifically, the B374 Analog Output mod-
ule interfaces field devices with the fol-
lowing output registers: 4010, 4012, 4014,
and 4016 of the 1K Micro 84, and 4010,
4012, 4014, 4016, 4018, 4020, 4022, and 4024
of the 2K Micro 84. The 1K Micro 84 sup-
ports a maximum of two B374’s, and the 2K
Micro 84 supports a maximum of four
J B374’s.
Whichever Micro 84 you use, it is important
that you understand the addressing tech-
nique used by the controller and its register
output modules. In addition to the B374,
the controller can use other modules such
as the B370 BCD Register Output Module.
Either of these modules can be the first
register output module. Whichever you use,
the first module addresses module output
registers 4010 and 4012. The second mod-
ule, regardless of whether it is a B370 or a
B374, addresses registers 4014 and 4016.
The third and fourth modules, if used, ad-
dress registers 4018 through 4024 in a
similar manner.
The B374 Analog Output Module features
two modes used with the Micro 84’s stand-
by operation. (Standby means that the
Micro 84 is powered up but not scanning.)
These two modes are “hold last output”
(HOLD) or “return to zero” (RTZ). HOLD re-
tains the value of the output current at the
time the Micro 84 switches to standby. RTZ
switches the output current to zero, which
is equivalent to an open circuit, whenever
the Micro 84 stops scanning. Scanning of
the Micro 84 can be stopped manually from
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