Broken Transmitter Bit, 16 Input Mode; Active Channel Indicator Inputs; Active Channel Indicator Inputs, 16 Input Mode - Automation Direct DL405 User Manual

Active Channel
Indicator Inputs,
16 Input Mode
Analog Data Bits,
16 Input Mode
Sign Bit,
16 Input Mode
Broken Transmitter
Bit, 16 Input Mode
The two bits 12 and 13 (inputs) of the
upper V-memory location indicate the
active channel. They
encoded to indicate up to four active
channels. Only the enabled channels
are updated. The module automatically
turns these inputs on and off to indicate
the active channel for each scan.
Bits Active
Scan 13 12 Channel
N 0 0
N+1 0 1
N+2 1 0
N+3 1 1
N+4 0 0
The first twelve bits of the first V-memory
location represent the analog data in
binary format. All input ranges use these
bits.
Bit Value Bit
0 1
1 2
2 4
3 8
4 16 10
5 32 11
Bipolar input ranges use the twelve
analog data bits as shown above, plus
an additional sign bit. Bit 15 in the input
word is the sign bit, and is a 1 when the
polarity of the active channel is negative.
If a unipolar mode is selected, the input
value is assumed to be greater than or
equal to zero, so this bit is always 0.
One of the 4–20 mA current ranges
features broken transmitter detection.
Bit 14 in the input word is set to 1 if the
current on the active channel is at 1.25
mA or less. This is useful for diagnostics
or troubleshooting logic built in to your
RLL program.
F4–04AD 4 Channel Analog Input
are binary
MSB
1 1
5 4
1
2
3
4
1
MSB
Value
1 1
5 4
6 64
7 128
8 256
9 512
1024
2048
MSB
1 1
5 4
MSB
1 1
5 4
V40401
1 1 1 1 9 8 7 6 5 4 3 2 1
3 2 1 0
– active channel inputs
V40401
1 1 1 1 9 8 7 6 5 4 3 2 1
3 2 1 0
– data bits
V40401
1 1 1 1 9 8 7 6 5 4 3 2 1
3 2 1 0
– sign bit
V40401
1 1 1 1 9 8 7 6 5 4 3 2 1
3 2 1 0
– broken transmitter bit
3–15
LSB
0
LSB
0
LSB
0
LSB
0