Table of Contents
Advertisement
SPA-ZC 302
6.2.
6.3.
52
Profibus-DPV1/SPA Gateway
Installation and Commissioning Manual
The process data is valid when the gateway mode bit indicates
application mode and SPA initializing bit is zero. Bit 3 must be zero
(SPA On-line). If bit 5 indicates a configuration warning, then some
of the data is invalid (unavailable). The unavailable items are
reported with 0xF in the Profibus message. For valid process data,
the SPA device status (IRF) information should also indicate no
errors and slave status bit must be set ( "1" ) for all the connected
slaves. For more information, see Section 6.2. Slave status word.
Slave status word
A slave's status word contains information about a maximum of 16 slaves. The first
bit represents the slave with the lowest SPA address. The second bit is the slave with
the second lowest address and so on. When the bit indicates 1, it means that the slave
is online and the data on profibus side is valid. In case of an event based data
updating, the device's SPA event mask has to be open. This error situation cannot
be seen from the slave status bit.
The device's SPA event mask has to be open when updating event
based data. This error situation cannot be seen from the slave status
bit. If the parameters cannot be read from the SPA device, the value
0xFF, 0xFFFF or 0xFFFFFFFF according to the size of the data.
Usage and purpose of SPA protocol events
When a protection relay detects an exception in normal operation (such as a trip or
a restart of the relay) an event is generated and buffered inside the protection relay,
providing that the event mask has been set correctly. Events are identified on the
SPA protocol as E-codes, for example E50, which indicates that the protection relay
has restarted. These events can later be uploaded from the relay to a SPA protocol
master. See the protection relay manual for details on triggers events.
The SPA-ZC 302 gateway contains a SPA master that is capable of uploading this
information from the protection relay. When the polling of events feature is enabled
in the configuration template, the SPA master transfers the information to the
Profibus master as a changed state of the parameter in question.
If multiple SPA connections from a protection relay are used, the
event based data should be read only to one of the connected SPA
masters. The Profibus-DPV1/SPA gateway contains such a SPA
master.
The event codes are also used in the gateway in a different way, such as to update
the measurement value of a binary input value. This feature is used in some standard
configurations concerning mainly start and trip information, and breaker state.
A single-bit and a double-bit indication uses SPA protocol events as presented in
Fig. 6.3.-1 .
1MRS755014
Advertisement
Table of Contents
