166 Rockwell Automation Publication 1769-IN088A-EN-P - February 2011
Chapter 3 I/O Memory Mapping
Configuration File
The read/writable configuration data file allows the setup of the hold last state
and user-defined safe state conditions.
The manipulation of the bits from this file is normally done with programming
software, such as RSLogix 500, RSLogix 5000, or RSNetWorx for DeviceNet,
during initial configuration of the system. In that case, graphical screens are
provided via the programmer to simplify configuration. However, some systems,
likek the 1769-ADN DeviceNet adapter, also allow the bits to be altered as part
of the control program using communication rungs. In that case, it is necessary to
understand the bit arrangment.
Program State Word
Word 1, the program state word, selects the hold last state or user-defined safe
state condition on a system transition from Run to Program.
Program Value Word
The program value word, word 2, is used to program the user-defined safe state
value (0=Off, 1=On). Each output is individually configurable for on or off.
Word
Bit Position
1514131211109876543210
0000000000000000PFE
1 Program State for Output Array Word 0
2 Program Value for Output Array Word 0
3 Fault State for Output Array Word 0
4 Fault Value for Output Array Word 0
Condition Bit Setting
User-defined Safe State 0
Hold Last State 1
Value Bit Setting
Off 0
On 1
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