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Serial communiction, IEC
The SPA and the IEC use the same rear communication port. To define the protocol to
be used, a setting is done on the local HMI. Refer to Installation and commissioning
manual for setting procedure.
When the type of communication protocol is defined, the power to the terminal has to
be switched off and on.
The settings for IEC 60870-5-103 communication are the following:
•
Individually blocking of commands
•
Setting of measurand type
•
Setting of main function type and activation of main function type
•
Settings for slave number and baud rate (communication speed)
•
Command for giving Block of information command
Each command has its own blocking setting and the state can be set to OFF or ON. The
OFF state corresponds to non-blocked state and ON corresponds to blocked state.
The type of measurands can be set to report standardised types, Type 3.1, Type 3.2,
Type 3.3, Type 3.4 or Type 9.
The use of main function type is to facilitate the engineering work of the terminal.The
main function type can be set to values according to the standard, this is, between 1 and
255. The value zero is used as default and corresponds to not used.
The setting for activation of main function type can be set to OFF or ON. The OFF state
corresponds to non-activated state and ON corresponds to activated state. Upon activat-
ed the main function type overrides all other settings for function type within the termi-
nal, that is, function type settings for event function and disturbance recorder function.
When set to OFF, function type settings for event function and disturbance recorder
function use their own function type settings made on the function blocks for the event
function and disturbance recorder respectively. Though for all other functions they use
the main function type even when set to OFF.
The slave number can be set to any value between 0 to 255.
The baud rate, the communication speed, can be set either to 9600 bits/s or 19200 bits/s.
Information command with the value one (1) blocks all information sent to the master
and abort any GI procedure or any file transfer in process. Thus issuing the command
with the value set to zero (0) will allow information to be polled by the master.
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