Technical data

12.2 Fundamentals of using the FMA Services
The request for an FMA service by the CP 5430 TF/CP 5431 FMS and the
transfer of the confirmation to the CPU of the PLC is the responsibility of
the handling blocks SEND and RECEIVE.
For FMA services, use job number ANR 200 when calling the HDBs SEND
and RECEIVE.
If an FMA service is requested, the following procedure is executed:
(Evaluation of status word)
SENDER
2
1
Indication that an "acknowledgment"
(confirmation) has arrived from
receiver CP
The confirmation is fetched with
an HDB RECEIVE; it consists of
an 8-byte header and the
requested data or parameters.
3
An 8-byte header (request block)
is sent with HDB SEND
(Evaluation of status word)
(Evaluation of condition code word)
(Evaluation of status word)
Fig. 12.1 Schematic Sequence of the FMA Services
B8976060/02 Service and Diagnostics using FMA Functions
12 - 5 Volume 1