Micromod MOD: 1800P - MOD 30ML Identity Module (Version 2) System, I/O and Communications Functions - Manual (Page 85)

Logic Functions - Book 1
ICN COMMUNICATION BLOCK
4-3
4.2 ICN COMMUNICATION BLOCK (ICN)
The ICN communication block is used to receive messages from other instruments on the
ICN, transmit responses to the processed messages and also transmit foreground data as
specified by the list designated by the user. The received messages, which pass validity
checks, are then either processed (eg. READ messages) or routed (eg. WRITE messages) to
the appropriate group for processing when that group becomes available.
One ICN communication block is required to support one 2030N ICN Communication module
(requires two slots). ICN1 is configured as port number one (slots 31-32) on the I/O Module
Block Selection display in the configurator, ICN2 is port two (slots 28-29 or 29-30), and ICN3
is port three (slots 25-26, 26-27, or 27-28). This block is used to define what configured list is
to be broadcast on the ICN and what diagnostic errors are to be reported.
Available to the user as block outputs are the ICN load, status of all diagnostic errors and
count values for the same diagnostic errors. A functional block diagram of the block is shown
in Figure 4-1. The menus used to configure the block are shown in Figure 4-2, Figure 4-3 and
Figure 4-4.
Read Msg
Write Msg
Diagnostic Group
Suppression
(NONE, 1-7)
Foreground
List
(NONE, CL#)
Reset
Counters
Suppress
Diagnostic Errors
Control
Contention
Authorized
Computer
Sources (1-5)
Device, Address
ANY
NONE
2030N ICN
Module
Receive Buffer
and Message
Checker
Router
Group
Processors Transmit Buffer
and Foreground
Data
ICN Address
Error Counters
MODULE MISSING OR INVALID
BUS RESTART
RESTART FAILURE
INVALID MESSAGE
CHECK-SUM ERROR
FRAMING ERROR
NOISE ERROR
OVERRUN ERROR
INVALID MESSAGE LENGTH
RECEIVE BUFFER FULL
TRANSMIT BUFFER FULL
UNEXPECTED COMM MESSAGE
ICN OVERLOAD
REQUEST BUFFER FULL
Error Checks
Load
MODMM
ADDR
1
2
I/O
Selection
Board Number
Slot Number
Figure 4-1. ICN Communication Block, Functional Block Diagram