Directly connected binary IO signal via binary input function block (SMBI) is always reported on
change, no changed detection is done in the event function block. Other Boolean signals, for
example a pickup or a trip signal from a protection function is event masked in the event function
block.
Double indications
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Double indications can only be reported for the first 8 inputs on an EVENT function block.
•
00 generates an intermediate event with the read status 0
•
01 generates an open event with the read status 1
•
10 generates a close event with the read status 2
•
11 generates an undefined event with the read status 3
Analog value
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All analog values are reported cyclic. The reporting interval is taken from the connected function if
there is a limit supervised signal, otherwise it is taken from the event function block.
Command handling
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Commands are transferred using transparent SPA-bus messages. The transparent SPA-bus
message is an explicit LON message, which contains an ASCII character message following the
coding rules of the SPA-bus protocol. The message is sent using explicit messages with message
code 41H and using acknowledged transport service.
Both the SPA-bus command messages (R or W) and the reply messages (D, A or N) are sent using
the same message code. It is mandatory that one device sends out only one SPA-bus message at a
time to one node and waits for the reply before sending the next message.
For commands from the operator workplace to the IED for apparatus control, That is, the function
blocks type SCSWI 1 to 30, SXCBR 1 to 18 and SXSWI 1 to 24; the SPA addresses are according to
table
Horizontal communication
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Network variables are used for communication between 500 and 670 series IEDs.Network
variables are used for communication between 500 and 650 series IEDs The supported network
variable type is SNVT_state (NV type 83). SNVT_state is used to communicate the state of a set of
1 to 16 Boolean values.
Multiple command send function block (MULTICMDSND) is used to pack the information to one
value. This value is transmitted to the receiving node and presented for the application by a
multiple command receive function block (MULTICMDRCV). With horizontal communication, the
input BOUND on MULTICMDSND must be set to 1. There are 10 MULTICMDSND and 60
MULTICMDRCV function blocks available. These function blocks are connected using the LON
network tool (LNT). The tool also defines the service and addressing on LON.
This is an overview for configuring the network variables for the IEDs.
Configuration of LON network variables
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Configure the Network variables according to the specific application using the LON network tool
(LNT). The following is an example of how to configure network variables concerning, for example,
interlocking between two IEDs.
Section 18
1MRK 502 066-UUS B
Station communication
1138
Technical manual
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