IEC 104 Protocol stack configuration
...
Any check against type ids should be considering the following combinations table:
| Type ID | Type ID with timetag | Alternative format type id |
| M_SP_NA_1 | M_SP_TA_1,M_SP_TB_1 | M_PS_NA_1 |
| M_DP_NA_1 | M_DP_TA_1,M_DP_TB_1 | M_EP_TA_1,M_EP_TD_1 |
| M_ST_NA_1 | M_ST_TA_1,M_ST_TB_1 | |
| M_BO_NA_1 | M_BO_TA_1,M_BO_TB_1 | |
| M_ME_NA_1 | M_ME_TA_1,M_ME_TD_1 | M_ME_ND_1 |
| M_ME_NB_1 | M_ME_TB_1,M_ME_TE_1 | |
| M_ME_NC_1 | M_ME_TC_1,M_ME_TF_1 | |
| M_IT_NA_1 | M_IT_TA_1,M_IT_TB_1 |
Example: any transmitted ASDU with type id M_SP_* type id is considered as valid if the exchange data configuration of a given datapoint specifies one the type id: M_SP_NA_1, M_SP_TA_1, M_SP_TB_1 and M_PS_NA_1
Path exploration
| Drawio | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
In redundant network configuration or generally in cases where several communication paths exist between one client and one server, the path checking exploration mechanism allows the client to try all the paths one by one without making any difference between them. The client uses the first available path. On disconnection this procedure starts again from the beginning.
TLS configuration
The CS 104 standard can also be used with TLS to realize secure and authenticated connections.
Parameters are needed to set up the TLS secured connection:
| Attribute | Description | Expected values | Mandatory |
|---|---|---|---|
| private_key | client private key | valid private key | YES |
| own_cert | client certificate | valid certificate | YES |
| ca_certs | allows to specify the ca certificates if not included in the owner certificate | list of valid certificates | NO |
| remote_certs | allows to specify the server certificates, so if specified, only these certificates are accepted | list of valid certificates | NO |
Fledge's certificate store allows certificates to be stored and used by the south plugins.
| Code Block | ||
|---|---|---|
| ||
{
"private_key":"iec104_client.key",
"own_cert":"iec104_client.cer",
"ca_certs":[
{
"cert_file":"iec104_ca.cer"
},
{
"cert_file":"iec104_ca2.cer"
}
],
"remote_certs":[
{
"cert_file":"iec104_server.cer"
}
]
} |
...