removed, which allows you to quickly replace
the B371 without disturbing field wiring. For
this wiring, you can use shielded or unshielded
wiring having a wire size of 14 to 22 AWG. The
terminals are clearly marked. This allows you to
make your field wiring connections quickly and
easily.
Besides the connector with its removable plug,
a FAULT indicator is also located on the front
of the BCD Register.
The indicator is a troubleshooting aid. It turns
on whenever the internal diagnostic test detects
a failure. This test continuously exercises the
following B371’s internal circuits: random ac-
cess memory (RAM), read only memory (ROM),
and communications circuitry during each scan
of the Micro 84. For predictability and safety, if
the test detects multiple consecutive failures, it
stops the Micro 84’s scanning operation and
turns on FAULT.
In addition to the FAULT indicator, Gould pro-
vides for an optional data change switch. This
switch, when closed, prevents the B371 from
reading incorrect values whenever you change
thumbwheel settings or change settings of
other field devices. Instead of a switch, you
could use a keyswitch to prevent unauthorized
tampering of thumbwheel or other field devices.
The BCD Register is easy to install. First it is
housed in a lightweight, shielded durable Lexan
case. It contains mounting brackets at the rear
of the case, which simplifies installation. Next,
it can be mounted anywhere in the I/O struc-
ture. Connectors located on the left- and right-
rear sides of the case plug into similar connec-
tors on adjacent modules.
This plugging action automatically connects the
8371 to the data bus of the Micro 84. If the
B371 is the right-most module in the I/O struc-
ture, you plug a termination connector into the
connector located on the right-rear side. This
termination connector is shipped with the
Micro 84 controller. The Micro 84 also provides
the B371 with operating voltages through this
connector. The 8371 does not require a
separate power supply.
The 8371-001 Register Input meets the stringent
requirements of both IEEE and ANSI standards
for radiated surge withstand capability (SWC).
The 8371 also withstands the severe voltage
transients, electromagnetic interference, and
magnetic fields commonly encountered in an in-
dustrial environment.
SPECIFICATIONS
Electrical Characteristics
Input Range
Levels
Bus Inputs
Strobe Outputs
O-8 VDC
Output Current Limit
4 mA (typical)
TTL or CMOS compatible
Module Isolation
1500 VRMS12500 VDC for
Logic “0” < 0.7 VDC
one minute
Logic “1” > 2.4 VDC
Field Device
ON < 200 ohms
Logic “0” < 0.4 VDC @ 2
Resistance
OFF > 40K ohms
mA
Multiplex Frequency
250 Hz (typical)
Logic “1” > 4.0 VDC @ 2
mA
Strobe Width
1 ms (typical)
Input/Output
Protection
240 VAC continuous
Circuit Characteristics
Topology
Field Device
Register Format
Two, 3-digit channels
Data Format
0 to 999 counts linear to
Passive or Active (tristate)
inputs
True High BCD Throughput Rate
Nos. 3001 & 3002 or
Both channels updated on
each scan
Nos. 3003 & 3004
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