SEW-Eurodrive INTERBUS UFI11A - Page 43

Manual – Fieldbus Interface INTERBUS UFI11A
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5
INTERBUS Interface
Parameter chan-
nel performs a
read type service
A PCP WRITE service must be performed before a parameter can be read via the pa-
rameter channel. The PCP WRITE service defines where the UFI11A data should be
available. A read service must take place on the acyclical parameter channel in order
for these data to get to the master. As a result, a PCP WRITE and a PCP READ are
always required for performing read services via the parameter channel. The following
table shows how read services are performed via the acyclical MOVILINK parameter
channel.
1. Reception is confirmed immediately, the parameter channel is evaluated and the re-
quested service performed.
2. Service confirmation is entered in the parameter channel and can be evaluated by
READ access in the master.
The acyclical MOVILINK parameter channel is only handled locally on the fieldbus inter-
face and is defined as in the following table.
Control (master) UFI11A fieldbus interface
1. Initiate the service coded in the parameter channel by means of a WRITE to the "MOVILINK parameter
channel cyclical" object.
WRITE 8299 (parameter channel)
OK
2. READ "MOVILINK parameter channel cyclical" and evaluation of the service confirmation in the para-
meter channel.
READ 8299 (parameter channel)
Data = Parameter channel with result
Index: 8299
Object code: 7 (simple variable)
Data type index : 10 (octet string)
Length: 8
Local address:
Password:
Access groups:
Access rights: Read all/Write all
Name[16]: -
Extension length: -