Publication 1747-UM006B-EN-P - June 2003
Differences Between the 1747-ASB Module and the 1771-ASB Series C Module B-5
Physical Slot Numbering
(page 3-2)
The 1771-ASB module resides in an unnumbered slot. The first
physical slot available to an I/O module is slot 0. The subsequent
physical slots are numbered decimally, up to a maximum of 15.
The 1747-ASB module resides in slot 0. The first physical slot
available to an I/O module is slot 1. The subsequent physical slots
are numbered decimally, up to a maximum of 30.
Status Indication
(page 7-1)
The 1771-ASB module has three LEDs that indicate module and
system status.
The 1747-ASB module has two LEDs and three 7-segment status
display that indicate module and system status. The 7-segment status
displays provide more detailed operating status and error indication
than what can be provided with LEDs.
Throughput
(page A-2)
In most cases the 1747-ASB throughput times are slower than the
1771-ASB throughput times. Refer to Appendix A for the 1747-ASB
throughput time information.
Inhibit Functionality
(page 6-3)
If some, but not all, of the 1771-ASB Series C, Revision E logical
devices are inhibited, the 1771-ASB module continues to:
• communicate on the RIO link
• control outputs in its chassis
If some, but not all, of the 1747-ASB logical devices are inhibited, the
1747-ASB module:
• continues to communicate on the RIO link if processor restart
lockout is not selected, or stops communicating on the RIO link
if processor restart lockout is selected
• stops controlling outputs in it's chassis regardless of the
processor restart lockout selection. Outputs are held in last state
if hold last state is selected or they are reset if hold last state is
not selected.
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