Specifications

Fieldbus Communications Support
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The INTERBUS NIM supports a maximum of 32 modules. The first four bytes (15h–
18h) provide the 32 bits that represent the module locations in a typical island
configuration. The remaining diagnostic bytes are available to support island
expansion capabilities.
Node Operational (Selector 25h–34h)
Node operational is an array of 8 words. Each bit represents one specific
addressable I/O module on the island bus.
z A value of 1 in a bit position indicates that the associated module is operating and
that no faults were detected.
z A value of 0 in a bit position indicates that the module is not operating because it
is not configured or it has an error.
When the selector value is from 25h to 34h, information about a particular module’s
operational status (according to the following table) is transmitted as the status
word’s low byte value:
The INTERBUS NIM supports a maximum of 32 modules. The first four bytes (25h–
28h) provide the 32 bits that represent the module locations in a typical island
configuration. The remaining diagnostic bytes are available to support island
expansion capabilities.
. . .
23h 120 119 118 117 116 115 114 113 modules 113–120
24h 127 126 125 124 123 122 121 modules 121–127
Selector Value Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Status Data
Selector Value Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Status Data
25h 8 7 6 5 4 3 2 1 modules 1–8
26h 16 15 14 13 12 11 10 9 modules 9–16
27h 24 23 22 21 20 19 18 17 modules 17–24
28h 32 31 30 29 28 27 26 25 modules 25–32
. . .
33h 120 119 118 117 116 115 114 113 modules 113–120
34h 127 126 125 124 123 122 121 modules 121–127