Specifications

STB NIP 2311 Services
EIO0000000051 6/2010 121
Data and Status Objects
Data exchange between the island and the fieldbus master involves three object
types:
z data objects: These objects represent the operating values that the master either
reads from the input modules or writes to the output modules.
z status objects: These objects are module health records sent to the input area of
the process image by all of the I/O modules and read by the master.
z echo output data objects: The digital output modules send these objects to the
input process image. These objects are usually a copy of the data objects, but
they can contain useful information if a digital output channel is configured to
handle the result of a reflex action.
A Data Exchange Example
The example uses the sample island bus assembly. The sample island comprises
the STB NIP 2311 NIM, eight Advantys STB I/O modules, a 24 VDC PDM, and an
STB XMP 1100 termination plate:
1 STB NIP 2311 network interface module
2 24 VDC power distribution module
3 STB DDI 3230 24 VDC two-channel digital input module
4 STB DDO 3200 24 VDC two-channel digital output module
5 STB DDI 3420 24 VDC four-channel digital input module
6 STB DDO 3410 24 VDC four-channel digital output module
7 STB DDI 3610 24 VDC six-channel digital input module
8 STB DDO 3600 24 VDC six-channel digital output module
9 STB AVI 1270 +/-10 VDC two-channel analog input module
10 STB AVO 1250 +/-10 VDC two-channel analog output module
11 STB XMP 1100 island bus termination plate
1 2 3 5 116 7
4
8 9 10