Rockwell Automation 1408-EMxx PowerMonitor 1000 Unit - Manual (Page 49)

Rockwell Automation Publication 1408-UM001D-EN-P - September 2013 49
Chapter
3
PowerMonitor 1000 Memory Organization
The power monitor memory is organized similarly to that of a PLC-5 or SLC
500 programmable controller. Data tables organize individual data items of
similar function. For example, the analog input set-up parameters are grouped in
one data table, and voltage, current, and frequency metering results in another.
Appendix A provides a detailed list of the power monitor data tables.
Data Table Addressing Data tables may be addressed in several ways.
• CSP addressing. This is also known as PLC-5 style or PCCC addressing.
Addresses are written in the form Axx:yy where A is a letter describing the
function of the data table, xx is the table number, and yy is the element
within, or offset into, the table. For example, F23:0 is the CSP address of
the first element in the energy metering results table.
• CIP addressing. This is also known as DeviceNet addressing. Addresses are
of the form Object:Instance:Attribute. CIP addressing allows addressing
only a single element of an entire data table. In CIP addressing, the energy
metering results table object 4 (Assembly object), instance 16 (energy
results table) and attribute 3 (data).
• Modbus RTU addressing. The data tables may be addressed by a Modbus
RTU master using Modbus register addressing. The Modbus protocol
supports four types of data: Discrete Input, Coil, Input Register, and
Holding Register. The power monitor supports Input Registers (read-
only) with addresses in the 30000 range and Holding Registers (read-write
or write only) with addresses in the 40000 range. Using the same example
as above, the energy results table has a Modbus address range of
30401…30438