sparky mark 9876
Member
My local AB tech guy insists that I must use block transfers with an analog module in a remote rack. I believe that he may be wrong.
This was a rack with a CPU which is being changed to a remote rack, which brings up the analog addressing problem.
I don't have an analog module to test right now but......
On the bench I have set up the following:
Local rack:
slot #0 is SLC 5/05
slot #4 is 1747-SN
Remote rack:
slot #0 is 1747-ASB
slot #1 is 1746-IB16
slot #2 will be 1746-NIO4I (2 analog inputs and 2 analog outputs)
slot #3 is 1746-IA16
slot #4 is 1746-IA16
slot #5 is 1746-OA16
I have set up the remote rack as 1/2 slot which gives two words per slot.
slot #1 input addresses begin at I:4.0/0
slot #3 input addresses begin at I:4.4/0
slot #5 output addresses begin at O:4.8/0
This works on the bench (for the discrete I/O modules)so I would expect the analog output addresses for slot #2 to be:
first output O:4.2
second output O:4.3
Will this work? I really would like to avoid using block transfers.
I realize that if I was using a four-channel analog module ( four inputs or four outputs) that I might have to leave some slots vacant.
Thanks in advance for any help.
This was a rack with a CPU which is being changed to a remote rack, which brings up the analog addressing problem.
I don't have an analog module to test right now but......
On the bench I have set up the following:
Local rack:
slot #0 is SLC 5/05
slot #4 is 1747-SN
Remote rack:
slot #0 is 1747-ASB
slot #1 is 1746-IB16
slot #2 will be 1746-NIO4I (2 analog inputs and 2 analog outputs)
slot #3 is 1746-IA16
slot #4 is 1746-IA16
slot #5 is 1746-OA16
I have set up the remote rack as 1/2 slot which gives two words per slot.
slot #1 input addresses begin at I:4.0/0
slot #3 input addresses begin at I:4.4/0
slot #5 output addresses begin at O:4.8/0
This works on the bench (for the discrete I/O modules)so I would expect the analog output addresses for slot #2 to be:
first output O:4.2
second output O:4.3
Will this work? I really would like to avoid using block transfers.
I realize that if I was using a four-channel analog module ( four inputs or four outputs) that I might have to leave some slots vacant.
Thanks in advance for any help.