- General Electric Computer Accessories User Manual

GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions •
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• 3-37
Diagnostic variables
The following table specifies variables that indicate the LAN health and status for
the LAN Configuration and Health function.
Variable Description
LAN connection ok Indicates that the health of the LAN connection is
good, such that the LAN watchdog function is
satisfied.
LAN commands OK
Indicates that the health of the LAN references is
good, based upon detection of two successive LAN
connection ok indications.
Heartbeat ref, lan
LAN heartbeat signal that proceeds from the
application layer to the local device, used locally for
LAN heartbeat trip) and LAN heartbeat alarm)
detection, and as the source of the reflected
Heartbeat fbk, lan signal.
Heartbeat fbk, lan Local device reflection of the Heartbeat ref, lan
signal that is sent back to the application layer.
Sys ISBus error cnt
Counter signal which provides an indication of the
rate of occurrence of ISBus fault conditions.
Sys ISBus error reg
Bit-coded value of the last ISBus fault detected;
each bit indicates a particular ISBus fault seen by
the control.
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 description
Determining the integrity of the LAN interface involves several communication
layers, and may vary depending upon the specific communication options in use.
The Innovation Series Drive has two levels of validation available: LAN watchdog
and LAN heartbeat. Status information is conveyed to the user and/or application by
status signals and fault declarations.