Rockwell Automation Publication 1769-IN088A-EN-P - February 2011 137
I/O Memory Mapping Chapter 3
Channel Configuration Words
The first two words of each eight word group in the configuration file allow you
to change the parameters of each channel independently. For example, words 8
and 9 correspond to channel 1 while words 16 and 17 correspond to channel 3.
The bits are defined as follows:
• E = Channel Enable: (0 = Disabled, 1 = output Enabled, process changes)
• Reserved = Set to zero
• SIU = System interrupt low clamp, under-range alarms: (0 = Disabled,
1 = Enabled)
• SIO = System interrupt high clamp, over-range alarms: (0 = Disabled,
1 = Enabled)
• LA = Latch low/high clamp, under/over-range alarms: (0 = Disabled,
1 = Enabled)
• ER = Enable ramping: (0 = Disabled, 1 = Enabled. Ramp rate limited by
fault states.)
• FM = Fault mode: (0 = Hold Last State, 1 = User Defined Value)
• PM = Program mode: (0 = Hold Last State, 1 = User Defined Value)
Word Description Word Description
0 Channel 0 Configuration Word 0 16 Channel 2 Configuration Word 0
1 Channel 0 Configuration Word 1 17 Channel 2 Configuration Word 1
2 Channel 0 Fault Value Word 18 Channel 2 Fault Value Word
3 Channel 0 Program Idle Mode Word 19 Channel 2 Program Idle Mode Word
4 Channel 0 Low Clamp 20 Channel 2 Low Clamp
5 Channel 0 High Clamp 21 Channel 2 High Clamp
6 Channel 0 Ramp Rate 22 Channel 2 Ramp Rate
7 Channel 0 Spare 23 Channel 2 Spare
8 Channel 1 Configuration Word 0 24 Channel 3 Configuration Word 0
9 Channel 1 Configuration Word 1 25 Channel 3 Configuration Word 1
10 Channel 1 Fault Value Word 26 Channel 3 Fault Value Word
11 Channel 1 Program Idle Mode Word 27 Channel 3 Program Idle Mode Word
12 Channel 1 Low Clamp 28 Channel 3 Low Clamp
13 Channel 1 High Clamp 29 Channel 3 High Clamp
14 Channel 1 Ramp Rate 30 Channel 3 Ramp Rate
15 Channel 1 Spare 31 Channel 3 Spare
Word
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 E Reserved SIU SIO LA ER FM PM HI PFE
1 Reserved Output Data
Format Select
Reserved Output Type/
Range
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