- General Electric Computer Accessories User Manual

3-34 •
••
• Chapter 3 Paramters/Functions Innovation Series Medium Voltage GP Type - G Drives GEH-6385
LAN Functions
LAN Overview
Information is available for the following LAN topics:
• Frame Phaselock Loop
• LAN Configuration and Health
• LAN Signal Map
Frame Phaselock Loop
The Frame Phaselock Loop function can synchronize the execution of the Innovation
Series drive control firmware with the communication frame of the product
application interface. This feature is available only for those interface which support
synchronous communications, such as ISBus.
Function outputs
The following table specifies the published output variables of the Frame Phaselock
Loop function.
Variable Description
Frame PLL OK status
Boolean signal indicating the lock status of the Frame
Phaselock Loop.
FPLL Phase error Phase error signal for the Frame Phaselock Loop.
Scaling is per-unitized such that unity corresponds to the
full frame period; signal values range from minus one-
half to plus one-half.
FPLL Freq Output
Frequency adjustment output signal for the Frame
Phaselock Loop. Scaling is per-unitized such that unity
corresponds to the full frame period; signal values range
from minus output limit to plus output limit.
Function configuration
The following table specifies configuration parameters related to the Frame
Phaselock Loop function.
Parameter Description
Network interface
Network interface type. Specifies one of the following
interface types:
No interface
ACL dual port memory (synchronous operation
supported)
ISBus (synchronous operation supported)
DRIVENET - Optional LAN modules such as Genius &
Profibus
LAN frame time
Expected communication frame period. Allowed frame
periods are 1, 2, 4, and 8 milliseconds.