Mayaya2017
Member
We are trying to use 1492-AIFM8S-3 module with 1756-IF8I module.
RA has a technical post "728767 - Wiring system solutions for 1756-IF8I, 1756-IF8IH, 1756-OF8I and 1756-OF8IH IO modules" showing you will need a 1492-ACABLE*YD part number to connect the AIFM8S-3 to IF8I for internal loop powered devices, and a 1492-ACABLE*YA to connect the AIFM8S-3 to IF8I for external powered devices. I.e., according to 728767 you CANNOT mix external powered device with internal loop powered device onto the same IF8I when 1492-AIFM8S-3 is used, you have to assign them to different IF8I modules and use the YD and YA cables accordingly.
I don't understand why that is necessary. In my understanding, external powered and internal powered devices can be mixed on IF8I, either YD or YA can be selected in conjunction with AIFM8S-3. A supporting clue would be page 215 of 1756-UM540E-EN-P, in there the manual shows for IF8I current type of wiring, YA cable is the only option you will need. Compare the 41171-192 and the 41171-199 wiring diagram in the 728767 and draw your own conclusion. (BTW, there is an error on 41171-192, pin 30 and 29 on IF8I are reversed).
There seems to be a discrepancy between the 728767 and the 1756-UM540E-EN-P, doesn't it?
Could any guru explain to me which one of them is more true?
Many thanks in advance.
RA has a technical post "728767 - Wiring system solutions for 1756-IF8I, 1756-IF8IH, 1756-OF8I and 1756-OF8IH IO modules" showing you will need a 1492-ACABLE*YD part number to connect the AIFM8S-3 to IF8I for internal loop powered devices, and a 1492-ACABLE*YA to connect the AIFM8S-3 to IF8I for external powered devices. I.e., according to 728767 you CANNOT mix external powered device with internal loop powered device onto the same IF8I when 1492-AIFM8S-3 is used, you have to assign them to different IF8I modules and use the YD and YA cables accordingly.
I don't understand why that is necessary. In my understanding, external powered and internal powered devices can be mixed on IF8I, either YD or YA can be selected in conjunction with AIFM8S-3. A supporting clue would be page 215 of 1756-UM540E-EN-P, in there the manual shows for IF8I current type of wiring, YA cable is the only option you will need. Compare the 41171-192 and the 41171-199 wiring diagram in the 728767 and draw your own conclusion. (BTW, there is an error on 41171-192, pin 30 and 29 on IF8I are reversed).
There seems to be a discrepancy between the 728767 and the 1756-UM540E-EN-P, doesn't it?
Could any guru explain to me which one of them is more true?
Many thanks in advance.