Siemens 500 NIM - Manual (Page 21)

Network Design Considerations 2-3 SIMATIC TIWAY I Series 500 NIM User Manual
Figure 2-1 is a simplified block diagram of the Series 500 NIM. The media
interface blocks are intentionally left unlabeled because the type of media
interface depends on which NIM model you are using. The blocks are
described as follows.
•
Special Function Interface Controller (SFIC) — delivers and receives
controller commands.
•
NIM controller — translates the controller commands and responses.
•
Communications controller — supervises data transactions between
the NIM and the network host.
NETWORK INTERFACE MODULE
SPECIAL
FUNCTION
INTERFACE
CONTROL-
LER
NIM
CONTROLLER
COMM.
CONTROL-
LER
POWER
TO
I/O
BASE
BUS
MEDIA
CARDS
TO
NETWORK
COMM.
MEDIA
Figure 2-1 NIM Simplified Block Diagram
NIM Block Diagram