Using the IEC 60870-5-104 Protocol
Mervis RT includes the functionality of an IEC 60870-5-104 server to provide data access to third parties. For example, it is used to regulate output power of power stations connected to the ČEZ distribuce network.
Limitations and Notes
For the IEC 60870-5-104 protocol to function, Mervis RT must be activated with an extended license that includes this protocol. To get it, contact the sales department of Unipi.
Running IEC 60870-5-104 server is certified only on Patron and Gate units, it can not be used on other Unipi controllers.
Configuration in Mervis IDE
As with other protocols, using the IEC 60870-5-104 protocol requires defining a server channel of the appropriate type at the PLC level.
Let's add a Server Channel:
We set its protocol to IEC 60870-5-104 and set desired protocol parameters.
Now, we add a server device, select it by clicking on it and we can set server parameters and add a datapoint.
One or more devices can be defined on the channel, differing in the set Common Address (ASDU) and TCP port.
Server Communication Channel
- Enable - True/False
- Link Protocol - TCP only
IEC 60870-5-104 Protocol Parameters
- Maximum Number of Unacknowledged APDU (K-value)
- Maximum Number of Unacknowledged APDU (W-value)
- Timeout of Acknowledgement (t1) - time interval
- Timeout of Acknowledgement via S-frame (t2) - time interval
- Timeout of Test Frame (t3) - time interval
- Check Maximum Delay of Control Commands - True/False
- Maximum Delay of Control Commands - time interval
- Remap Types for Interrogation - True/False
- During initial interrogation, data types with time stamps will be replaced with data types without time stamps.
Device
Device properties include parameters for connecting clients to the server:
- Enable - True/False
TCP Parameters
- IP Address
- The address of the network interface on which the server should listen. Currently, only the value 0.0.0.0 for all interfaces is supported.
- Port - The TCP port on which the server listens. Default value 2404
IEC 60870-5-104 Protocol Parameters
- Common Address (ASDU)
Data Point
IEC 60870-5-104 Data Point Parameters
- Identification Object Address
- Identification Object Type
- Mapped Variable
Supported Data Types
| M_SP_NA_1 [1] | Single point information |
|---|---|
| M_SP_TA_1 [2] | Single point information with time tag |
| M_DP_NA_1 [3] | Double point information |
| M_DP_TA_1 [4] | Double point information with time tag |
| M_ST_NA_1 [5] | Step position information |
| M_ST_TA_1 [6] | Step position information with time tag |
| M_BO_NA_1 [7] | Bitstring of 32 bits |
| M_BO_TA_1 [8] | Bitstring of 32 bits with time tag |
| M_ME_NA_1 [9] | Measured normalized value |
| M_ME_TA_1 [10] | Measured normalized value with time tag |
| M_ME_NB_1 [11] | Measured scaled value |
| M_ME_TB_1 [12] | Measured scaled value with time tag |
| M_ME_NC_1 [13] | Measured short floating point value |
| M_ME_TC_1 [14] | Measured short floating point value with time tag |
| M_ME_ND_1 [21] | Measured normalized value without quality descriptor |
| M_SP_TB_1 [30] | Single point information with CP56Time2a time tag |
| M_DP_TB_1 [31] | Double point information with CP56Time2a time tag |
| M_ST_TB_1 [32] | Step position information with CP56Time2a time tag |
| M_BO_TB_1 [33] | Bitstring of 32 bits with CP56Time2a time tag |
| M_ME_TD_1 [34] | Measured normalized value with CP56Time2a time tag |
| M_ME_TE_1 [35] | Measured scaled value with CP56Time2a time tag |
| M_ME_TF_1 [36] | Measured short floating point value with CP56Time2a time tag |
| C_SC_NA_1 [45] | Single command |
| C_DC_NA_1 [46] | Double command |
| C_RC_NA_1 [47] | Regulating step command |
| C_SE_NA_1 [48] | Set-point command, normalised value |
| C_SE_NB_1 [49] | Set-point command, scaled value |
| C_SE_NC_1 [50] | Set-point command, short floating point value |
| C_BO_NA_1 [51] | Bitstring command, 32 bits |
| C_SC_TA_1 [58] | Single command with CP56Time2a time tag |
| C_DC_TA_1 [59] | Double command with CP56Time2a time tag |
| C_RC_TA_1 [60] | Regulating step command with CP56Time2a time tag |
| C_SE_TA_1 [61] | Set-point command, normalised value with CP56Time2a time tag |
| C_SE_TB_1 [62] | Set-point command, scaled value with CP56Time2a time tag |
| C_SE_TC_1 [63] | Set-point command, short floating point value with CP56Time2a time tag |
| C_BO_TA_1 [64] | Bitstring command, 32 bits with CP56Time2a time tag |
