Spa Operation Principle; Operation Principle; Introduction Of Spa Protocol; Spa Protocol - ABB Relion 670 Series Communication Protocol Manual

1MRK 511 396-UEN E
Section 3
3.1

Operation principle

The SPA bus uses an asynchronous serial communications protocol (1 start bit, 7 data bits +
even parity, 1 stop bit) with data transfer rate up to 38400 bit/s. For more information on
recommended baud rate for each type of IED, refer to Technical reference manual. Messages
on the bus consist of ASCII characters.
3.1.1

Introduction of SPA protocol

The basic construction of the protocol assumes that the slave has no self-initiated need to talk
to the master but the master is aware of the data contained in the slaves and, consequently,
can request required data. In addition, the master can send data to the slave. Requesting by
the master can be performed either by sequenced polling (for example, for event information)
or only on demand.
The master requests slave information using request messages and sends information to the
slave in write messages. Furthermore, the master can send all slaves in common a broadcast
message containing time or other data. The inactive state of bus transmit and receive lines is a
logical "1".
3.1.2

SPA protocol

The tables below specify the SPA addresses for reading data from and writing data to an IED
with the SPA communication protocol implemented.
The SPA addresses for the pulse counter values PCFCNT:1 to PCFCNT:16 are found in table 1.
Table 1:
Function block
PCFCNT:1
PCFCNT:2
PCFCNT:3
PCFCNT:4
PCFCNT:5
PCFCNT:6
PCFCNT:7
PCFCNT:8
PCFCNT:9
PCFCNT:10
PCFCNT:11
PCFCNT:12
PCFCNT:13
PCFCNT:14
PCFCNT:15
PCFCNT:16
SPA, 670 series
Communication protocol manual

SPA operation principle

SPA addresses for the PCFCNT function
SPA address CNT_VAL
6-O-2788
6-O-2794
6-O-2800
6-O-2806
6-O-2812
6-O-2818
6-O-2824
6-O-2830
6-O-2836
6-O-2842
6-O-2848
6-O-2854
6-O-2860
6-O-2866
6-O-2872
6-O-2878
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SPA address NEW_VAL
6-O-2787
6-O-2793
6-O-2799
6-O-2805
6-O-2811
6-O-2817
6-O-2823
6-O-2829
6-O-2835
6-O-2841
6-O-2847
6-O-2853
6-O-2859
6-O-2865
6-O-2871
6-O-2877
Section 3
SPA operation principle
IP14401-1 v3
M11880-3 v2
M11880-7 v2
M11880-10 v5
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