IDEC SX5L Series - Manual (Page 64)

A PPENDIX
SX5L C OMMUNICATION T ERMINAL U SER ’ S M ANUAL A-3
Network management tool
A tool used to perform network management.
Network variable
A data item that a particular device application program expects to get from other device on a network (an input network
variable) or expects to make available to other devices on a network (an output network variable). Examples are a temper-
ature, switch value, and actuator position setting.
Neuron Chip
A microprocessor that supports LonTalk protocol. The SX5L uses Toshiba TMPN3120FE5M with a 10-MHz clock quartz
oscillator.
Neuron ID
Every L ON W ORKS device has a unique 48-bit identifier called the Neuron ID. The Neuron ID is typically assigned when a
device is manufactured and used for network management.
Node ID
The third layer of the device address. Node ID identifies an individual device within a subnet. Up to 127 devices can be
defined within a single subnet.
Protocol analyzer
Software or hardware that enables to monitor the data transmitted through the network.
SCPT
An acronym for Standard Configuration Property Type. SNVTs are standardized definitions of the units, scaling, encoding,
and meaning of the contents of configuration properties.
SNVT
An acronym for Standard Network Variable Type. SNVTs are standardized definitions of the units, scaling, and encoding
of the contents of network variables.
SNVT_elapsed_tm
SNVT index 87, used to measure elapsed time. The SX5L uses SNVT_elepsed_tm for configuration property nciMaxSts-
SendT to determine the heartbeat transmission intervals.
SNVT_lev_percent
SNVT index 81, used to represent data in percent. The SX5L uses SNVT_lev_percent for output network variables
nvoAI0 through nvoAI3 of the Analog Input functional block. When the measured value exceeds the limit, 0x7FFF is sent.
Measurement Type Size and Structure Size Valid Type Range Note
Elapsed Time
7 bytes
typedef struct {
unsigned long day;
unsigned short hour;
unsigned short minute;
unsigned short second;
unsigned long millisecond;
} SNVT_elapsed_tm;
day 0 .. 65,534 65,535: null elapsed
hour 0 .. 23 —
minute 0 .. 59 —
second 0 .. 59 —
millisecond 0 .. 999 —
Measurement Type Size and Category Valid Type Range Type Resolution Note
Percentage Level 2 bytes (signed long) –163.840% .. 163.830% 0.005% or 50 ppm 0x7FFF: invalid data