Rockwell Automation Publication 20A-UM001N-EN-P - July 2013 95
Supplemental Drive Information Appendix A
Communication
Configurations
Typical Programmable Controller Configurations
This section provides information for programmable controller configurations
and bit settings for logic command word and logic status word.
For a description of logic command word bit settings, see Table 18 on page 96
.
For a description of logic status word bit settings, see Table 19 on page 97
.
If block transfers are programmed to continuously write information to the
drive, be sure to properly format the block transfer.
If attribute 10 is selected for the block transfer, values are written only to RAM
and are not saved by the drive. This is the preferred attribute for continuous
transfers.
If attribute 9 is selected, each program scan completes a write to the
non-volatile Electrically Erasable Programmable Read-Only Memory (EEPROM)
of the drive. Because the EEPROM has a fixed number of writes, continuous
block transfers can quickly damage the EEPROM.
Do not assign attribute 9 to continuous block transfers. Refer to the individual
communications adapter user manual for additional details.
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