VIPA System 200V IM Series, Manual

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Manual VIPA System 200V
Chapter 4 Interbus
HB97E - IM - Rev. 06/29 4-13
During the ID cycle that is executed when the Interbus system is being
initialized the different modules connected to the bus identify themselves
with their individual functionality and the word length. When the Interbus
coupler is turned on, it determines its Interbus length during the
initialization phase of the bus modules and generates the respective
ID code. Depending on the configuration the Interbus coupler replies with a
message identifying it as an analog or a digital remote bus device with
variable word length.
The Interbus ID code consists of 2Byte. The MSB (Byte 2) describes the
length of the data words that will be transferred. Where the width of the
input and output data differs, the larger value is used for the Interbus data
width. The remaining 3Bit are reserved.
When the module is identified by means of the ID code, the master can
only be informed of the data width by means of a word. It is for this reason
that the data width is always an even number.
The LSB (Byte 1) describes the type of bus module, i.e. the type of signal
and other performance criteria like remote bus, peripheral bus module,
PCP, ENCOM or DRIVECOM. Bit 1 and 2 determine the direction of the
data.
Byte Bit 7 ... Bit 0
1 Bit 1 ... Bit 0: Direction of data transfer:
00: not used
01:
output
10: input
11: input/output
Bit 3 ... Bit 2: terminal type
Bit 7 ... Bit 4: terminal class
The type and class are determined by the Interbus-Club
2 Bit 4 ... Bit 0: Data width 0 to 10 words (binary)
Bit 7 ... Bit 5: reserved
ID code and
ID length
Structure of the
Interbus
ID code