numbering and connections diagram. For
voltage operation, simply remove this shor-
ting bar.
Besides the terminal strip, an OUT OF
RANGE diagnostic indicator for
troubleshooting is also located on the front
of the B375 module. It flashes whenever the
input is out of its prescribed range (4 to 20
mA or 1 to 5 V). This indicator will also
show that one of the input wires is either
shorted to ground or open.
Both channel 1 and channel 2 inputs are
isolated from each other. In addition, the
inputs are isolated from all I/O modules
connected to the Micro 84 and from the
Micro 84 controller itself.
The 8375 is easy to install. First it is hous-
ed in a light-weight, shielded, durable Lex-
an case. It contains mounting brackets at
the rear of the case which simplify installa-
tion. Next, 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 Analog Input Module to the data
bus of the Micro 84. If the B375 is the right-
most module in the l/O structure, you plug
a termination connector into the connector
located on the right-rear side. This termina-
tion connector is shipped with the Micro 84
controller. To minimize installation costs,
the Micro 84 provides the B375 with all
operating voltages, thus eliminating the
need for a separate power supply.
The B375 meets the stringent requirements
of both IEEE and ANSI standards for
radiated surge withstand capability (SWC).
The B375 also withstands the severe
voltage transients, electromagnetic in-
terference, and magnetic fields commonly
encountered in an industrial environment.
SPECIFICATIONS
Electrical Characteristics
Input Range
4-20 mA or l-5 VDC
Resolution
1 of 999 counts
current mode 16 PA per count
voltage mode
4 mV per count
Accuracy
+ 0.1 %/I count @
25OC
f 0.3%/3 counts @
O-60 OC *
*(You can recalibrate to + 0.15% at a
particular temperature betwen 0-6OOC.)
Linearity
0.1% of full scale
Input Impedance
current mode
250 ohms
voltage mode
1 Megohm, differential
0.5 megohm each in-
put to shield
Input Protection 240 VRMS
Channel Isolation 20 V/-9.5 V (with
respect to module
shield terminal)
Module Isolation 1500 VRMS for one
minute
Common Mode
Rejection
Input Filter
- 86 dB @ 50/60 Hz
-3 dB down @ 18 Hz;
rolloff 20 dB per
decade
Circuit Characteristics
Topology
2 channels
Data Format
0 to 999 counts linear
Operating Modes
Independently selec-
to inputs
table current or Throughput Rate 1.25 samples per se-
voltage cond (each channel)
Register Format
Nos. 3001 & 3002 or
Nos. 3003 & 3004
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