MOVITRAC
®
31.. PROFIBUS Fieldbus Interface
55
The PROFIBUS-FMS
Interface
4
4.4
Communications Relationship List of the Master
A CRL corresponding to the CRL in the inverter must be configured in the FMS master to be able to
communicate with the MOVITRAC
®
31.. inverter via PROFIBUS-FMS. The master CRL must con-
form to the following conventions:
1.
The FMS master may expect no more services from the slave than supported by the latter. The
“Features supported” parameter may therefore only contain the service primitives (Request)
that are defined as indications in the corresponding slave CRL.
2.
The size of the Receive PDU (Rec. HiPrio, Rec.LoPrio) of the master must be at least be that of
the Send PDU (Send HiPrio, Send LoPrio) of the slave.
3.
The corresponding flow control counters must agree
(SCC
Master
= RCC
Slave
and RCC
Master
= SCC
Slave
).
The following table shows a communications relationship list specified in the master referring to an
inverter with the station address 8 and the CREF 7.
Example of a master CRL for an acyclic master slave link:
CREF
Type
ATTR
LSAP
RSAP
RADR
SCC
RCC
SAC
RAC
ACI/CCI
3
MSAZ
D
NIL
25
8
1
0
0
0
0
max PDU Size:
Features supported
Supported FMS services
Send HiPrio
0
80 33 00 00 00 00
Read.req
Write.req
Phys.-Read.req
Phys.-Write.req
Get-OV-long.req
Send LoPrio
241
Rec. HiPrio
0
Rec. LoPrio
241
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