the programming panel, or by a program
pack, or by the internal diagnostics of the
controller.
The RTZ and HOLD modes permit safer
operation by allowing you to select the
output condition best suited by your ap-
plication, whenever the Micro 84 enters
standby. The HOLD or RTZ mode is switch
selectable.
The toggle switches for selecting the HOLD
and RTZ modes are located on the rear of
the B374 housing, (see the last page of
this data sheet for the location of these
switches.) Switch 1 controls channel 1 and
switch 2 controls channel 2. Switches 3
and 4 are not used. Set each switch either
“up” for RTZ or “down” for HOLD before
installing the B374.
The 8374 Analog Output Module is easy to
install. It is housed in a lightweight, shield-
ed, durable, dripproof Lexan case. It con-
tains mounting brackets which simplify ins-
tallation. It can be mounted anywhere in
the l/O structure. Connectors located on
the left- and right-rear sides of the case
plug into similar connectors on adjacent
modules.
This plugging action automatically con-
nects the B374 to the data bus of the Micro
84 Controller. If the B374 is the right-most
module in the l/O structure, plug a termina-
tion connector into the connector on the
right-rear side. This termination connector
is supplied with the
Micro
84 controller.
Field wiring is also easy to install. Connect
field wiring to front-mounted, screw ter-
minal strip. It is recommended that you use
shielded, twisted-pair cable with insulating
jacket to minimize radiated interference.
The terminal strip is compatible with an
optional Fanning Strip (P/N 0212-012), which
allows quick module replacement without
disturbing field wiring. All terminals are
clearly marked for their intended function.
The B374 requires an external power supply
for its operating voltages. This same power
supply can also be used to power one or
both current loops.
Besides the terminal strip, a POWER indi-
cator is also located on the front of the
B374 module as a troubleshooting aid. This
green indicator is on when the external
power supply is connected to the module.
When the POWER indicator is off, it shows
that the module is not receiving its oper-
ating voltages and, thus, will not operate.
The screw terminal strip provides terminals
that allow you to use a voltmeter to
monitor the output current. Just connect a
high impedance voltmeter between the
VOLTAGE MON. (1 or 2) and CURRENT
SOURCE (1 or 2) as shown in the “Terminal
Numbering and Output Connections” dia-
gram. The voltage will range from + 1 to
+5 VDC. It is proportional to the output
current.
Both channel 1 and channel 2 outputs are
isolated from each other and from all l/O
modules connected to the
Micro
84. In ad-
dition, the channels are isolated from the
Micro
84 controller itself.
The B374 meets the stringent requirements
of both IEEE and ANSI standards for surge
withstand capability (SWC). The module
has been designed to meet the require-
ments of both UL and CSA standards. The
B374 also withstands the severe voltage
transients, electromagnetic interference,
and magnetic fields commonly encountered
in an industrial environment.
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