Instruction Manual

Things To Consider Before Using
Your Module
This chapter explains how the module and the SLC processor
communicate through the processor’s I/O image tables. It also
describes the module’s input filter characteristics. Topics discussed
include:
• module ID code
• module addressing
• channel filter frequency selection
• Channel turn-on, turn-off, and reconfiguration times
• response to slot disabling
Module ID Code
The module ID code is a unique number assigned to each type of
1746 I/O module. The ID defines for the processor the type of I/O
module and the number of words used in the processor’s I/O image
table.
With APS software, use the system I/O configuration display to
manually enter the module ID when assigning the slot number during
the configuration. Do this by selecting (other) from the list of
modules on the system I/O configuration display and enter 3500, the
ID code for the 1746sc-NI8u.
No special I/O configuration (SPIO CONFIG) is required. The
module ID automatically assigns the correct number of input and
output words.
If you are using different programming software package, refer to the
documentation that came with your software.
Module Addressing
The following memory map shows you how the SLC processor’s
output and input tables are defined for the module.
Chapter 3