Problem with 1747-SN?

1747-SN faulted ("COMM LED" on 1747-SN lit flashing green), while 1747-ASB modules was running properly.
Do I have anythings missing?

I have 3 13-slot chassis in stalled in the same cabinet.
SN module is on the local chassis, close with SLC5/05 processor.
ASB modules are on the remote chassis.
The following is the dip SW setting.

1747-SN...ASB1.....ASB2

SW1

1-0.......1-1......1-1(logical rack)

2-1.......2-1......2-1

..........3-1......3-1

..........4-1......4-1

..........5-1......5-1

..........6-1......6-0

..........7-0......7-0 (starting logical group)

..........8-0......8-1

(SN: baud rate = 230.4K)

(ASB1: Logical rack 0, start at group 0)

(ASB2: Logical rack 1, start at group 4)

SW2

..........1-0......1-0(baud rate = 230.4K)

..........2-1......2-1

..........3-0......3-0 (Complementary)

..........4-1......4-1 (Default)

..........5-1......5-1

..........6-1......6-1

..........7-1......7-1 (Number of logical group)

..........8-0......8-0

(ASB1,2: Number of logical group =4)

SW3

..........1-0......1-0(Hold last state,Default)

..........2-1......2-1 (Default)

..........3-1......3-1 (Default)

..........4-1......4-0 (last chassis)

..........5-1......5-1

..........6-0......6-0 (addressing mode, 1-slot)

..........7-1......7-1 (Discrete)

..........8-1......8-1 (Default)

(ASB2: set as last chassis)

(ASB1,2: set as single slot)

Note: 0=off, 1=on

IO Configuration

Local chassis: There are 6 cards of 1747-NI8

and 4 cards of 1747-NO4I .

ASB1 chassis: There are 12 cards of 1747-IB16.

ASB2 chassis: There are 2 cards of 1747-IB16

and 9 cards of 1746-OW16.

My guess is the analog modules. We may need to know more about where EXACTLY they are located.

On a past project, I had an addressing issue due to analog modules in adjacent slots. I believe there are strict rules about this...I'm sure the A-B experts will know.

Hi' Jimmie the following is the IO configuration

Local rack
Slot0
L533B/C:1747SN:1746NI8:1746NI8:1746NI8:1746NI8:1746NI8:
1746NI8:EMPTY:1746NO4I:1746NO4I:1746NO4I:1746NO4I

ASB1 rack
Slot0
1747ASB:1746IB16:1746IB16:1746IB16:1746IB16:1746IB16:
1746IB16:1746IB16:1746IB16:1746IB16:1746IB16:1746IB16:1746IB16

ASB2 rack
Slot0
1747ASB:1746IB16:1746IB16:1746OW16:1746OW16:1746OW16:1746OW16:
1746OW16:1746OW16:1746OW16:1746OW16:1746OW16:EMPTY

According to the manual, the flashing green LED means that the scanner is operating properly, but at least one of the remote adapters is not communicating.

Here's the manual:

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1747-um013_-en-p.pdf
I would check each remote chassis and try to isolate the problem.

Greetings bundhit ...



sorry that I’m short on time ... but as near as I can tell from here, these should be the DIP switch settings for your two ASB modules ...








the ones that I’ve highlighted are the ones that I think you’ll need to change ... but ... I might be reading your original post wrong too ... if it appears that might be the case, please post again and give us more details as to your present switch settings ...



also ... you haven’t mentioned how you have the “G-Data” configured for your SN module ... I think (again based on how I understand what you’ve posted) that the following setup is what you need ...







on another note: if all three chassis are located close enough together in the same enclosure, then there is a chance that you don’t need the expensive SN module and/or the two ASB modules at all ... have you researched the possibility of using the 1746-C7; 1746-C9; or 1746-C16 “chassis interconnect cables” for your system? ... the different part numbers are for different cable lengths ... the longest is about 50 inches long ... be sure that you understand how to connect the chassis end-to-end correctly if you decide to go this route ... if this will work for you, it could save about $2,000 or more - and make addressing and troubleshooting the system a LOT easier in the long run ...








one more thing - from your latest post ...



when you use a 1747-ASB module, the numbering of the slots in the chassis changes ... “Slot 0” will not contain the ASB ... specifically, the ASB slot will not have a number assigned to it ...







hope this helps ...

Everything you need to diagnose the problem can be found in the module's M1 file. See the section starting on page 67 of http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1747-um013_-en-p.pdf

I would take Ron's advice & use the I/C cables, the only caveat there is that each expansion rack needs its own 1747-PX (X=1..5) power supply/