Micromod MOD: 1800P - MOD 30ML Identity Module (Version 2) Algorithms, Tables and Sequential Logic Functions - Manual (Page 96)

Logic Functions - Book 2
SUPERVISORY MESSAGE BLOCK
8-88
EXAMPLE 2 Operator Triggered Read Message
The following example shows a read message transaction. The transaction is triggered by an
operator write to the send command. When the transaction is triggered, the supervisory
message block sends a read request message to the message destination. The message
response is stored in the result field. The operator configures the maximum allowed response
time and the maximum number of times to retry the transaction if it is not successful. A failed
transaction triggers a process alarm (PA1).
R
Operator write to
initiate send command
Operator indication of active status,
failure count, message code
indicating success or type of failure,
result, and result quality.
SEND
CODE
FCNT
SM1
Send Command
2
1
ICN to Message
Destination
ICN
FAIL
A
Fail Count
Max Response Time
Operator write access to set
the maximum response time
and maximum number of
times to retry the transaction
before failure.
Fail
Max Number of Retries
Active
Result
RQ
Result Quality
Message Code
STAT
Alarm, Src
Alarm Status
PA1
To Other
Logic
Read Request
Message Response
Figure 8-47. Example 2: Operator Triggered Read Message