Broken Transmitter Bits, 32 Input Mode - Automation Direct DL405 User Manual

3–18
F4–04AD 4-Channel Analog Input
Sign Bits,
32 Input Mode
Broken Transmitter
bits, 32 Input Mode
Four bits (4 to 7) of the upper word are
dedicated for use as sign bits. These are
individually assigned to each of the four
channels. When an input bit is on, the
data for the corresponding channel
represents a negative value. When the
bit is off, the data is positive.
Bit Channel
4 1
5 2
6 3
7 4
Four bits (8 to 11) of the upper word are
dedicated for use as broken transmitter
indications. They are only operational for
the 4 to 20 mA. input range. When an
input bit is on, the current for the
corresponding channel is at or below
1.25 mA. When the condition ends, the
bit automatically turns off.
Bit Channel
8 1
9 2
10 3
11 4
V40401
MSB
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1
5 4 3 2 1 0
V40402
MSB
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1
5 4 3 2 1 0
– sign bits
V40401
MSB
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1
5 4 3 2 1 0
V40402
MSB
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1
5 4 3 2 1 0
– broken transmitter bits
LSB
0
LSB
0
LSB
0
LSB
0