Rockwell Automation 1746-NO8V SLC 500 8-Point Analog Output Module/ User Manual - Manual (Page 65)

1 Publication 1746-UM026A-EN-P - September 2003
Appendix
B
Replacing 1746-NO4s with 1746-NO8
Converting from 1746-NO4
to 1746-NO8 This information is provided for those who are replacing two
1746-NO4 modules with one 1746-NO8 module.
When using the 1746-NO8 module in Class 1 mode, no changes to the
user program are required, except that the addressing will change
when using one 1746-NO8 to replace two 1746-NO4 modules (see
addressing example that follows). Additional status feedback is also
available, and monitoring logic may be added if desired.
Module ID Code
The module identification code is a unique number encoded for each
1746 I/O module. The code defines for the processor the type of I/O
or specialty module residing in a specific slot in the 1746 chassis.
The 1746-NO8 supports either Class 1, or Class 3 interface, while the
1746-NO4 supports only Class 1. When directly replacing 1746-NO4
modules, the Class 1 interface should be used if direct replacement
with minimal program changes is desired. The Class 3 interface offers
additional user configuration flexibility. However, additional user
program modifications will be required to make use of these features.
Refer to Chapters 3 and 4 for further definition of the Class 3 interface
and programming software requirements.
Using your programming device, configure the slot with the
appropriate code. In this example, the 1746-NO8 is in slot 3.
Table B.1 1746-NO8 Modules ID Codes
Catalog Number Module ID Code
1746-NO8I 3527 class 1 mode (8 inputs/8 outputs)
12727 class 3 mode (16 inputs/32 outputs)
1746-NO8V 3528 class 1 mode (8 inputs/8 outputs)
12728 class 3 mode (16 inputs/32 outputs)