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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.
The Low and
High Bytes
Data type is transmitted in the ID code’s low byte; data length and message
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