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Use Channel Status Words
O:e.4
15
14
O:e.5
15
14
O:e.6
15
14
O:e.7
15
14
Channel status words are stored in the SLC controller's input image
file at addresses I:e.4 to I:e.7 (where e is the slot number assigned to
the module). Status words 4...7 correspond to and reflect the
configuration of channels 0...3 (O:e.0...O:e.3).
Whenever a channel is disabled (O:e.x/11 = 0), its corresponding
status word is zero. This condition tells you that input data contained
in the channel data word is invalid and should be ignored.
IMPORTANT
The status word of an enabled channel indicates the following status:
• Bits 0...10 reflect the channel configuration
• Bit 11 indicates whether the channel is enabled or disabled
(configuration)
• Bits 12...15 indicate detected faults should they occur
We present status words as they appear in the input image table at
I:e.4...I:e.7.
Module Input Image (Status Words)
CH 0 Channel Status Word
13
12
11
10
9
CH 1 Channel Status Word
13
12
11
10
9
CH 2 Channel Status Word
13
12
11
10
9
CH 3 Channel Status Word
13
12
11
10
9
1 = detected open input condition
1 = detected under-range input value
1 = detected over-range input value
1 = detected invalid channel configuration
The status word from a disabled channel is always zero.
8
7
6
5
4
8
7
6
5
4
8
7
6
5
4
8
7
6
5
4
Reflect the Configuration Word
Publication 1746-UM614B-EN-P - September 2007
Channel Configuration, Data, and Status
3
2
1
0
3
2
1
0
3
2
1
0
3
2
1
0
53
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