Rockwell Automation MMCL Using the Mining, Mineral, and Cement Library (MMCL) in RSLogix 5000 Appli - Manual (Page 20)

Publication RA-UM002B-EN-P - November 2010
20 Rules and Recommendations
Typical Add-On Instruction Function Call
Each MMCL Add-On Instruction function has three data structures:
• All direct Inputs/Outputs are specified by the Backing Tag (instance
name of Add-On Instruction).
• The ModuleData Tag is referenced by the Add-On Instruction, this data
may be read and written by other modules/devices. It contains HMI
data (Sta, Cmd, and Val) or Parameters (Par).
• The Global Tag is used by all modules and contains common
Parameters or, for example, the interface for the Startup Warnings
(Horn/Flash) and Alarm Gong.
Add-On Instruction Module Data Structure
Add-On Instruction
Backing Tag