Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 62)

4-2 Understanding the I/O Image
needed. Likewise, five PowerFlex drives on CH1 in Multi-Drive mode
using control would require 11 words of I/O.
Table 4.C 1769-SM2 Module I/O Image Examples
The Module Control Word (output word 0) is used for all channels, where:
The Module Control Word is a “master” enable/disable switch for
communications on each channel when using the module in Single or
Multi-Drive mode (only DSI operation). The actual output/input data
being sent/received is determined by Parameter 07 - [DSI I/O Cfg 1],
Parameter 22 - [DSI I/O Cfg 2], and Parameter 37 - [DSI I/O Cfg 3].
Important: If the Channel “x” Enable bit is transitioned from ON (1) to
OFF (0), the connected PowerFlex 4-Class drives will fault.
The Channel “x” Enable bits are not used when the module is configured
for Modbus RTU Master operation in Multi-Drive mode.
TIP: To minimize the number of I/O words needed, connect the drive(s)
starting with CH1, followed by CH2, and then CH3.
Operating
Mode
CH1
Parameter 07 -
[DSI I/O Cfg 1] CH2
Parameter 22 -
[DSI I/O Cfg 2] CH3
Parameter 37 -
[DSI I/O Cfg 3] Maximum
I/O Words
Used
Maximum Drives
Connected
Single “0” (Drive 0) “0” (Drive 0) “0” (Drive 0) 7 3 (1/channel)
Multi-Drive
“0” (Drive 0) “0” (Drive 0) “0” (Drive 0) 23 3 (1/channel)
“4” (Drive 0…4) “0” (Drive 0) “0” (Drive 0) 23 (1) 7 (5/CH1, 1/CH2,
and 1/CH3)
“4” (Drive 0…4) “4” (Drive 0…4) “0” (Drive 0) 23 (2) 11 (5/CH1, 5/CH2,
and 1/CH3)
“4” (Drive 0…4) “4” (Drive 0…4) “4” (Drive 0…4) 31 15 (5/each CH)
(1) If CH2 and CH3 would not be used (only 5 drives connected to CH1), the I/O size in the RSLogix 500/5000 module
configuration window could be set to “11” instead of “23” to save I/O space.
(2) If CH3 would not be used (only CH1 and CH2 have 5 drives each), the I/O size in the RSLogix 500/5000 module
configuration window could be set to “21” instead of “23” to save I/O space.
Module Control Word
Bit # Name Description
0 Channel 1 Enable “0” = Disables sending output data (Logic Command/
Reference) to the respective channel’s drive(s). All
input (Logic Status/Feedback) data is zeroed (“0”) to
indicate that the data is no longer being updated.
“1” = Enables sending output data (Logic Command/
Reference) to the respective channel’s drive(s). All
respective input data will also be updated.
1 Channel 2 Enable
2 Channel 3 Enable
3…15 Not used Reserved for future use.