Allen-Bradley 1407-CGCM, User Manual, Page: 43 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
CGCM Unit Operation #HAPTER
3OFTWARE)NPUTSAND/UTPUTS
Your Logix family host programmable controller must include the hardware and
communication interfaces with the generator, prime mover, power system, and
balance of plant that are not specifically included in the CGCM unit module.
The software interface between the CGCM unit and its host controller is made
via the ControlNet software interface. The specific interface consists of several
assembly instances, or data tables.
•
The Input (Scheduled Read) table provides time-critical status and fault
parameters, and control commands, from the CGCM unit to the host
Logix controller.
•
The Output (Scheduled Write) table provides time-critical enable
commands, selection commands, and setpoints from the host controller to
the CGCM unit.
•
The Unscheduled Read table provides non time critical metering data
from the CGCM unit to the host controller.
•
The Unscheduled Write table provides a means to adjust selected gains and
(in firmware revision 3.
x
or later) energy counter presets while excitation is
enabled.
•
The Configuration table contains the basic CGCM unit configuration
parameters and is automatically transferred from the host controller to the
CGCM unit on powerup and at other times when excitation is not
enabled.
Refer to Chapter 6 , CGCM Unit Software Interface , for more detailed
information on the CGCM unit software interface.
/PERATIONAL&UNCTIONS
The following sections describe the operational functions of the CGCM unit.
The functions include the following:
•
Excitation Control Modes
•
Limiting Functions
•
Protection Functions
•
Synchronizing
•
Real-power Load Sharing
•
Metering
•
Redundancy
•
Watchdog Timer