Rockwell Automation 865 Differential Protection Relay - Manual (Page 136)

7-10 Communications
865-UM001A-EN-P – July 2009
Table 7.7 – Profibus DP Parameters
Parameter Value Unit Description Note
Mode
Cont
Reqst
Profile selection
Continuous mode
Request mode
Set
bit/s 2400 bps Communication speed from the main
CPU to the Profibus converter. (The
actual Profibus bit rate is
automatically set by the Profibus
master and can be up to 12 Mbit/s.)
Emode
Channel
(Limit60)
(NoLimit)
Event numbering style.
Use this for new installations.
(The other modes are for
compatibility with old systems.)
(Set)
InBuf bytes Size of Profibus master's Rx buffer.
(data to the master)
OutBuf bytes Size of Profibus master's Tx buffer.
(data from the master)
Addr 1 – 247 This address has to be unique within
the Profibus network system. Set
Conv
–
VE
Converter type
No converter recognized
Converter type "VE" is recognized
Set = An editable parameter (password needed)
Clr = Clearing to zero is possible
In continuous mode the size depends of the biggest configured data offset of a data item
to be send to the master. In request mode the size is 8 bytes.
In continuous mode the size depends of the biggest configured data offset of a data to be
read from the master. In request mode the size is 8 bytes.
When configuring the Profibus master system, the length of these buffers are needed. The
device calculates the lengths according the Profibus data and profile configuration and the
values define the in/out module to be configured for the Profibus master.
If the value is "–", Profibus protocol has not been selected or the device has not restarted
after protocol change or there is a communication problem between the main CPU and the
Profibus ASIC.
SPA-bus
The manager has full support for the SPA-bus protocol including
reading and writing the setting values. Also reading of multiple
consecutive status data bits, measurement values or setting values
with one message is supported.
Several simultaneous instances of this protocol, using different
physical ports, are possible, but the events can be read by one single
instance only.