1 Publication 1747-UM006B-EN-P - June 2003
Appendix
B
Differences Between the 1747-ASB Module
and the 1771-ASB Series C Module
This appendix examines the differences between Catalog Number
1747-ASB and Catalog Number 1771-ASB Series C, Revision E or later.
These differences are:
• image size selection
• hold last state operation
• specialty I/O module mapping and control
• remote expansion chassis
• starting logical group number selection
• inserting and removing I/O modules under power
• DIP switch locations
• I/O module keying
• physical slot numbering
• status indication
• throughput performance
• inhibit functionality
Page and chapter references are provided within each heading so you
can quickly review the information specific to Catalog Number
1747-ASB.
The 1771-ASB image size is automatically selected based on the
chassis size and addressing mode. The automatic assignment is
possible because the number of 1771 chassis physical slots are
provided in 2-group multiples. Therefore, there are no unused
physical I/O slots or scanner image that is not utilized.
Image Size Selection
(page 4-10)
The 1747-ASB image size must be selected with DIP switches
(SW2-5,6,7,8). The selection is necessary because the 1746 chassis are
not provided in 2-group multiples. In some cases, you must make a
choice between not using a slot or not using scanner image. For more
information on odd size chassis and image conditions, refer to page
4-13.
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