I'm Stuck

I have a customer that has a contrologix L61 that is mastering a rack of SLC IO by means of a 1756-DHRIO in the contrologix and a 1747-ASB in the SLCside from what I understand there used to be a 5/04 running this conveyor system and they upgraded to contrologix to have ethernet. Go Figure. Anyway the 1756 chasis is full and they are all 32 point modules and the SLC chasis has 1 slot open.

This system runs all the high speed conveyors in the plant and they can't shut it down and it is a 24/7 operation. We may be able to shut it down for 1 or maybe 2 minutes but thats it.

If iI shut it down and plug a a slc 16 point ac input module into that slot does anything need to reconfigured on the 1756-DHRIO card are in the L61?

Are there any dip switch canges that have to be made on the 1747-ASB?

From what I read I don't think so but I wanted to ask before I did this on such a critical system.

Describe exactly which modules are in the SLC chassis.

Probably the 1747-ASB is already scanning that slot with the existing configuration, so all you have to do is power down the 1746 chassis, insert the module, and power back up.

But if the logical configuration of the 1746 chassis means that the one empty slot requires another chunk of I/O memory, then you'll have to make DIP switch changes to the 1747-ASB and configuration changes to the 1756-DHRIO.

I realize that you can't get the exact module part numbers, but just describing them (8-point, 16-point, 32-point, blue, green, red, orange) and describing the configuration of the RIO adapter in RSLogix 5000 should let us figure it out.

1746 Chasis Layout

Slot 0 = 1747-ASB
Slot 1 = 1746-IA16
Slot 2 = 1746-IA16
Slot 3 = 1746-IA16
Slot 4 = 1746-IA16
Slot 5 = 1746-IA16
Slot 6 = 1746-OA16
Slot 7 = 1746-OA16
Slot 8 = 1746-OA16
Slot 9 = 1746-OA16
Slot 10 = 1746-OA16
Slot 11 = 1746-OA16
Slot 12 = Spare

Looks like the RIO is channel B and it has 2 racks configured 0 and 1

In the module properties for rack 0 the rack # which is grayed out is 1 octal? but the name says rack 0? and starting group is 0

Size is full rack 8 IO groups

In the module properties for rack 1 the rack # which is grayed out is 2 octal? but the name says rack 1? and starting group is 2

Size is 1/2 rack 4 IO groups

Hmm. There's something weird going on here.

The "Rack Name" can be anything: you can call it "RackLouisXIV" if you want. The important part is the "Rack Number (octal)" value, the Starting Group value, and the Rack Size value.

It sounds like whomever put it together started to call it Rack 0 and Rack 1 but then set the DIP switches differently and changed the 1756-DHRIO scanlist to match, with Rack addresses 1 and 2 instead.

Twelve slots would ordinarily be one Full Rack and one Half Rack. A 1747-ASB adapter can emulate multiple contiguous logical racks.

But having the second logical rack begin at Group 2 doesn't make sense. I don't think that would even work, and if it did then the 1746-OA16 modules in slots 9 and 10 would be inaccessible to the program.

Verify that you've been given the correct ControlLogix *.ACD file and that the 1746-OA16 modules in slots 9 and 10 are actually used.

The way it "ought to be":

Ken

It works because I am online with it and all the modules are controlled and work.

The layout is what ws confusing me once I started digging In. I know who the person was that did this job first and he is not all that bright so it would be no surprise if something is wrong but it is all working.

I can send you the acd by email if you have time to take a look.

Just curious, did you have to do anything with the dip switches on the ASB when you added the new card? Specifically, SW3 number 8.

Shawn

shawn_75 said:

Just curious, did you have to do anything with the dip switches on the ASB when you added the new card? Specifically, SW3 number 8.

Shawn

Click to expand...

Nope nothing has been changes as of yet. Jyst making a plan and getting informed.