DL205 Analog Manual, 7th Edition Rev. D
5-12
Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input
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Active Channel Indicator Inputs
Two of the inputs are binary-encoded to
indicate the active channel (remember,
the V-memory bits are mapped directly to
discrete inputs). The inputs automatically
turn on and off to indicate the current
channel for each scan.
Scan X34 X35 X36 Channel
N Off Off Off 1
N+1 On Off Off 2
N+2 Off On Off 3
N+3 On On Off 4
N+4 Off Off On 5
N+5 On Off On 6
N+6 Off On On 7
N+7 On On On 8
Module Diagnostic and Sign
The MSB input bit is the broken
transmitter/no 24V indicator and the sign
indicator.
If the bit is on and the data is zero, there is
no 24V input power or the terminal block is
loose or missing. If the data is not 0 (zero),
the input represents the sign bit.
Module Resolution
Since the module has 12-bit unipolar
resolution, the analog signal is converted
into 4096 counts ranging from 0–4095
(2
12
). For example, with a 0–10V scale,
a 0V signal would be 0, and a 10V signal
would be 4095. This is equivalent to a
binary value of 0000 0000 0000 to 1111
1111 1111, or 000 to FFF hexadecimal.
The diagram shows how this relates to each
signal range. The bipolar ranges utilize a
sign bit to provide 13-bit resolution. A
value of 4095 can represent the upper limit
of either side of the range. Use the sign bit
to determine negative values.
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=channel inputs
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V40401
BSLBSM
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0
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=diagnosticinput/signbit
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