t Owner manual

Rockwell Automation Publication IASIMP-QS016C-EN-P - October 2014 439
Appendix
D
Digital and Analog Energy Add-On Instructions
This appendix describes the behavior of all Digital and Analog Energy Add-On Instructions with the exception of the
Energy_Electric_Analog or Energy_Electric Digital Add-On Instructions, described in Appendix C.
The Digital and Analog Energy Add-On Instructions perform four functions.
A total consumption calculation for the metered input. This value is stored in the output, Val_Total_xxx.
A consumption rate calculation for the metered input over a predefined interval set by the user. This value, also
known as Average Flow rate, is stored in the output, Val_xxx_Per_Calc_Interval.
Equipment Status Faceplate update of the energy total Val_Total_xxx, the flow rate (Val_xxx_Per_Min or
Va l _ xxx_Per_Hr), and energy device status information.
Alarm History Faceplate update of information needed to display predefined alarm messages based on the energy
device status.
CompactLogix Digital Input Logic
Logic is provided in all Energy_xxx_Digital Add-On Instructions to calculate energy consumption from CompactLogix
digital inputs. The Inp_Pulse tag initiates an energy computation, where 1 pulse = 1 (unit).
Every time a pulse is triggered, the logic adds the value of the Set_Meter_Pulse_Factor tag to the Val_Total_xxx (total
consumption) tag. The Set_Meter_Pulse_Factor, is set by default to 1, but can be user-defined for scaling purposes.
Energy Add-On Instruction Unit
Air_Flow cf
Fuel_Oil gallons
Propane gallons
Steam_Flow lbs
Water_Flow gallons