Schneider Electric INTERBUS Basic Network Interface Module User Manual
Fieldbus Communications Support
36
890USE19600 April 2004
The INTERBUS ID Code
Introduction
The ID cycle is part of the INTERBUS network’s initialization process. After
determining the length of its own data during network initialization, every network
device reports its functionality and byte length in the two-byte ID code. The
INTERBUS ID code is a 16-bit word that describes the data type, data length and
module type (digital/analog, input/output/mixed) of network devices.
determining the length of its own data during network initialization, every network
device reports its functionality and byte length in the two-byte ID code. The
INTERBUS ID code is a 16-bit word that describes the data type, data length and
module type (digital/analog, input/output/mixed) of network devices.
The Low and
High Bytes
High Bytes
Data type is transmitted in the ID code’s low byte; data length and message
information are reported in the high byte:
information are reported in the high byte:
1
data type (03h, 33h)
2
data length (0 to 16 words)
3
messages (for management functions)
Data Type
The INTERBUS NIM recognizes one of two possible data types:
Data Type
Signal Direction
Signal Type
03h
input/output
digital
33h
input/output
analog or mixed