4. Configuration
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The Standard IEC 60870-5-104, section “Transmission control using Start/Stop”, foresee the
commands STARTDT and STOPDT utilization to data traffic control between client and server,
using simple or multiple connections. Despite Nexto supports such commands, its utilization isn’t
recommended to control data transmission, mainly with redundant CPUs, because such commands
aren’t synchronized between both CPUs. Intead of using multiple connections between client and
Nexto server, it’s suggested the use of NIC Teamming resources to supply (physically) redundant
Ethernet channels and preserve the CPU resources (CPU control centers).
Server diagnostic
The Server IEC 60870-5-104 protocol diagnostics are stored in T_DIAG_IEC104_SERVER_1 type
variables, which are dscribed in Table 4-109.
Diagnostic variable of type T_DIAG_IEC104_SERVER_1.*
Command bits, automatically reset:
Server IEC 60870-5-104 is
running.
Communication channel
closed. Server won’t accept
connection request. ENUM
value (0).
Server is listening to the
configured port and there is
no connected clients. ENUM
value (1).
Connected client. ENUM
value (2).
Client queue is overflowed.
Events number in the queue
Number of received frames.
Communication errors
counter, including physical
layer, link layer and transport
layer errors.
Table 4-109. Server IEC 60870-5-104 Diagnostics
Commands Qualifier
The standard IEC 60870-5-104 foresee four different command qualifiers for the objects Single
Command, Double Command and Regulation Step, all supported by the Nexto Server.
Each object type has an speciffic behavior to each command qualifier, as can be seen on the table
below.
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