PI-B371-001 Rev B
B371-001 BCD Register Input Module
DATA SHEET
, The 8371-001 BCD Register Input Module converts two, 12-bit binary coded decimal numbers to a numerical
value and applies this value to the Micro 84’” controller.
FEATURES
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Two 3-digit channels
Popular True High BCD Format
Active or passive field device compatible
Data inhibit capability during data
selection
TTL and CMOS compatible
12-bit BCD resolution
Continuous on-line diagnostics
Removable wiring strip
Designed for harsh industrial environments
UL listed
GENERAL DESCRIPTION
The B371-001 BCD Register Input is an input
module for the Micro 84 controller. It converts
each of two 12.bit binary coded decimal (BCD)
signals to a numerical value. This value ranges
from 0 to 999. The actual numerical value is
J directly proportional to the BCD input. For ex-
ample, if the BCD input increases 10 percent,
the numerical output also increases 10 percent.
The BCD Register takes the numerical value
and transfers it automatically to input registers
3001 through 3004. Once in one of these
registers, the numberical value can control a
timer, or a counter, or a sequencer. It can also
be manipulated by arithmetic functions. Typical-
ly, the B371 is used in applications such as in-
terfacing operator control panels with the
Micro 84, set point control, and data
acquisition.
Looking at the terminal numbering and connec-
tions diagrams, notice that the inputs to the
B371 come from thumbwheels, keypads, panel
meters, and other BCD compatible devices.
The format of this input is true high (positive)
BCD with isolating diodes. These diodes are
polarized so that the anode of each diode is
connected to the thumbwheel switch common,
and the cathode is connected to each input of
the B371 12-line BCD bus. You can see this by
looking at the connections diagram. This
diagram shows the connections for two thumb-
wheels or other BCD devices. If you use only
one, the diodes are not required. Digital panel
meters should have tri-state outputs, if both
channels are used.
Notice from the diagram that two BCD devices
(or channels) are multiplexed to the B371 on
one 12.line BCD bus. These channels are con-
trolled by two strobes: Strobe 1 and Strobe 2.
These strobes alternately select, in true high
format, each channel at a through-put rate suffi.
cient to update both channels on each scan of
the Micro 84.
The B371 terminal strip shown on the diagram
is the front panel connector.
This connector contains a removable male plug
that contains 15screw terminals. It is easily
ii!+ GOULD
Electronics
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