Technical data

☞
Make sure there can be no overlapping of job numbers and
LSAPs for FMS links. COM 5431 FMS does not check this
automatically.
Checking data transmission in the control program
If frames are transmitted by a PLC, the PLC expects an acknowledgment.
This acknowledgment can either be positive or negative and simply
indicates whether or not the frame arrived at the communications partner.
The acknowledgment provides information about the processing status of
the frame and can be evaluated by the updated status word (ANZW) of the
HDBs CONTROL/SEND/RECEIVE.
The status word (refer to Section 7.1.2) informs you about the
following:
➣
The status of a job
➣
The data management
➣
Any errors which may have occurred
Link to station
with L2 address via LSAP no. with SEND-ANR and RECEIVE-ANR
12 1 101
23 2 102
34 3 103
.
.
.
.
.
.
.
.
31 32 31 131
Table 7.1 SAP-ANR (Job Numbers) - Assignment Proposed by COM
B8976060/02 S5-S5 Communication
7 - 3 Volume 1