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ASICs
For simple and fast digital exchange between programmable logic controllers,
Siemens offers users various ASICs. These ASICs either support or handle the
entire data exchange between the automation stations according to the PROFIBUS
standards and guidelines DIN 19245 Part 1, Part 2, Part 3 and PROFIBUS PA
(Part 4), EN 50170 Volume 2, IEC 61158 Ed.3, and IEC 61784-1. The SPC 4
also supports the Foundation Fieldbus as described in IEC 61158. Ed3.
Functionality
The SPC 4
model and requires an additional microprocessor to implement layers 2 and 7.
With the SPC 4
the other functions of layer 2 (interfacing, management) an additional
microprocessor is required.
In addition to the layer 2 functionality, the following productive services are also
integrated on the ASIC: Data_Exchange, Read_Input, Read_Output and the
Global_Control command of DIN E 19245 Part 3/EN50170/IEC61158 as well as
the PROFIBUS-PA functionality (DIN E 19245 Part 4/EN 50170/IEC 61158, IEC
61784-1).
SPC 4-2 supports the following communication profiles:
●
PROFIBUS FMS
●
PROFIBUS PA
●
PROFIBUS DP
●
Foundation Fieldbus®
The communication profiles and the possible combinations with the physical media
(copper, glass-fiber) are described in the IEC 61784-1 standard (apart from
PROFIBUS-FMS, see EN 50170 Vol. 2).
The SPC 4-2 supports passive nodes on the bus system (slaves) and filters out all
external frames and bad data frames.
To extend the SPC 4-2 for PROFIBUS PA and FF, the SIM 1 communication
interface chip is available. The SIM 1 ASIC implements the function of a Medium
Attachment Unit (MAU).
1
Foundation Fieldbus is a registered trademark of Fieldbus Foundation.
10
®
-2 (Siemens PROFIBUS Controller) operates at layer 1 of the OSI
®
-2 , parts of layer 2 that handle the bus protocol are integrated. For
1
(FF).
PROFIBUS Controller SPC 4®-2 LF
C79000-G8976-C157-3
®
-2
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