Rockwell Automation 865 Differential Protection Relay - Manual (Page 137)

Communications 7-11
865-UM001A-EN-P – July 2009
Table 7.8 – SPA-bus Parameters
Parameter Value Unit Description Note
Addr 1 – 899 SPA-bus address. Must be unique in
the system. Set
bit/s
1200
2400
4800
9600
(default)
19200
bps Communication speed Set
Emode
Channel
(Limit60)
(NoLimit)
Event numbering style.
Use this for new installations.
(The other modes are for
compatibility with old systems.)
(Set)
Set = An editable parameter (password needed)
IEC 60870-5-103
The IEC standard 60870-5-103 "Companion standard for the
informative interface of protection equipment" provides standardized
communication interface to a primary system (master system).
The unbalanced transmission mode of the protocol is used, and the
device functions as a secondary station (slave) in the communication.
Data is transferred to the primary system using "data acquisition by
polling"-principle. The IEC functionality includes the following
application functions:
•
station initialization
•
general interrogation
•
clock synchronization and
•
command transmission
It is not possible to transfer parameter data or disturbance recordings
via the IEC 103 protocol interface.
The following ASDU (Application Service Data Unit) types will be
used in communication from the device:
•
ASDU 1: time tagged message
•
ASDU 3: Measurands I
•
ASDU 5: Identification message
•
ASDU 6: Time synchronization and
•
ASDU 8: Termination of general interrogation