Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 43)

Configuring the Module 3-5
2. Enter the Series letter of the 1769-SM2, which can be determined by
checking the data nameplate label on the module (item 9 in
Figure 1.1 ).
The I/O image of the module can be up to 31 words of Input and 31
words of Output, depending on the mode selected (Single or
Multi-Drive) and the number of drives connected. A Single mode
system with one drive on each channel requires 7 Input words and 7
Output words. A Multi-Drive mode system with five drives on each
channel requires 31 Input words and 31 Output words. See
Table 3.A
or Table 3.B to determine the number of Input Words and Output
Words to enter for your system.
The Extra Data Length field can only be set to a size of 0 or 42. If the
controller will contain the configuration data for download to the
1769-SM2 module (Configuration Mode Switch SW1 set to CONT
position), set this value to 42. If the configuration data will be
contained in the 1769-SM2 parameters (Configuration Mode Switch
SW1 set to PARAM position), this value should be set to 0. See
Table 3.C for descriptions of these configuration words.
Figure 3.2 Expansion General Configuration Tab Screen