Input Bit Assignments; Active Channel Indicator Inputs - Automation Direct DL405 User Manual

Input Bit You may recall the F4–16AD–2 module requires 16 discrete input points from the
Assignments CPU. These 16 points provide:
Since all input points are automatically mapped into V-memory, it is very easy to
determine the location of the data word that will be assigned to the module.
Within this word location, the individual bits represent specific information about the
analog signal.
Active Channel
Indicator Inputs
S
An indication of which channel is active.
S
The digital representation of the analog signal.
The bits (inputs) shown in the diagram
indicate the active channel. The next to
last four bits of the V-memory location
indicate the active channel. The inputs
are automatically turned on and off on
each CPU scan to indicate the active
channel.
Channel
Scan Inputs Channel
N 0000
N+1 0001
N+2 0010
N+3 0011
N+4 0100
N+5 0101
N+6 0110
N+7 0111
F4–16AD–2 16-Channel Analog Input
F4-16AD–2
8pt 8pt 16pt 16pt
Input Input Input Input
X0 X10 X20 X40
– – –
X7 X17 X37 X57
V40400 V40402
V40401
MSB
Bit 15 14 13 12 11 10 9 8 7 6
X X X
3 3 2
7 0 7
MSB
1 1 1
5 4 3
Scan
1
N+8
2
N+9
3
N+10
4
N+11
5
N+12
6
N+13
7
N+14
8
N+15
16pt 16pt
Output Output
–
LSB
5 4 3 2 1 0
X
2
0
V40401
LSB
1 1 1 9 8 7 6 5 4 3 2 1
2 1 0
– channel inputs
Channel
Inputs Channel
1000 9
1001 10
1010 11
1011 12
1100 13
1101 14
1110 15
1111 16
7–11
0