Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 108)

7-6 CompactLogix Example Ladder Programs
Figure 7.3 Example CompactLogix Single Mode Ladder Logic CH1 Subroutine (Continued)
This rung unlatches the contact that turns on the Start command when the drive is not communicating with the 1769-SM2.
This prevents the drive from immediately starting when communications are restored. If an immediate start is desired for an
application, this rung could be deleted.
7 /
CH1_Valid_Data
U
CH1_Start
i
8
CH1_Start
Channel 1
Logic Command
Bit 01
Local:1:O.Data[1].1
9
CH1_Jog
Channel 1
Logic Command
Bit 02
Local:1:O.Data[1].2
10
CH1_Clear_Fault
Channel 1
Logic Command
Bit 03
Local:1:O.Data[1].3
11
CH1_Forward_Cmd
Channel 1
Logic Command
Bit 04
Local:1:O.Data[1].4
12 /
CH1_Forward_Cmd
Channel 1
Logic Command
Bit 05
Local:1:O.Data[1].5
This rung displays the Reference being sent to the drive. An integer represents the xxx.x Hz format (decimal is implied) used
by the drive, so a displayed value of "300" equates to 30.0 Hz.
13 Move
Source CH1_Reference
100
Dest Local:1:O.Data[2]
100
MOV
Channel 1
Reference Word
These rungs send an explicit message to the 1769-SM2 to read/write Parameter 78 [Jog Frequency]. In Single mode, the
desired parameter number is the value entered for the Instance number.
14
CH1_Read_Param
EN
DN
ER
Type - CIP Generic
Message Control CH1_Read_Msg ...
MSG