SEW-Eurodrive MOVIDRIVE DFP11A, Manual, Page: 42 / 52

42
MOVIDRIVE
®
PROFIBUS DFP11A
4
The PROFIBUS-FMS
Interface
Fig. 42 shows the sequence of parameter access via the cyclic MOVILINK
®
parameter channel. The
inverter will only start executing the service when the master has toggled the handshake bit in the
parameter channel. To do this, the master has to read the parameter channel at the beginning of
the parameter adjustment in order to maintain the present status of the handshake bit in the
inverter. The master can now initiate the evaluation of the parameter channel in the inverter by tog-
gling the handshake bit. The inverter will then execute the service coded in the parameter channel
and enter the service acknowledgement in the parameter channel. The master will receive the serv-
ice acknowledgement with the next Read access to the “MOVILINK Cyclic Parameter Channel”.
01237AEN
Fig. 42: Sequence of the cyclic FMS services for parameter access with “MOVILINK Cyclic Parameter Channel”
4.2.7 “MOVILINK Acyclic Parameter Channel” Object
The “MOVILINK Acyclic Parameter Channel” object is 8 bytes long and comprises the MOVILINK
®
parameter channel. This object can be used for acyclic parameter access, i.e. the drive inverter will
execute the service coded in the parameter channel each time it receives a WRITE service to this
object. The handshake bit is not evaluated. Fig. 43 shows the structure of the “MOVILINK Acyclic
Parameter Channel” communications object. For the structure of the parameter channel please
refer to the “MOVILINK
®
Communications and Device Profile” documentation and the DP Section
of this Manual.
01236AEN
Fig. 43: Structure of the “MOVILINK Acyclic Parameter Channel” object
Higher Level Control System
(Master)
READ 8298 (parameter channel)
Data = Parameter channel
WRITE 8298 (parameter channel)
OK
READ 8298 (parameter channel)
Data = Parameter channel with result
MOVIDRIVE
®
(Slave)
1. READ "MOVILINK Cyclic Parameter Channel" to evaluate
the status of the handshake bit.
2. Initiate execution of the service coded in the parameter
channel with WRITE to the "MOVILINK Cyclic Parameter
Channel" object and toggling of the handshake bit
3. READ "MOVILINK Cyclic Parameter Channel" and evaluate
service acknowledgement in the parameter channel.
Octet 0 Octet 1 Octet 2 Octet 3 Octet 4 Octet 5 Octet 6 Octet 7
4-byte data Parameter index
Manage-
ment
Management
Reserved
Index
high
Index
low Data
MSB
Data Data
Data
LSB
Reserved