Reliance Electric UVZC3207 PLC Driver module

The master driver supported on each application port of the module emulates an IEC 60870-5-103 Master device. Configuration of each port is independent and should be connected to different serial networks. Each port on the module communicates with one or more controlled stations on what are referred to as sessions. A session represents a controlled device with a unique data link layer address. Each session (controlled device) contains one or more data sets (sectors) that are defined by the vendor of the device. The following illustration shows these relationships.

Port 0 on the module 

communicates with 4 sessions (0, 1, 3 and 4) each of which has their own data set(s). Session 1 only has one sector (all data for device contained in a single database). This sector is addressed by the master using the Common address of ASDU value set for the sector in the configuration file. Session 0 contains two sectors each with their own unique Common address of ASDU value to identify the sector.Port 1 is connected to one device on the network. This device is defined in the Session 2 section of the configuration file. In this example, all data of the device is stored in a single sector.

The IEC 60870-5-103 specification

 only supports the unbalanced mode. No support is given in the protocol for the balanced mode and the module does not support this mode. The module supports two application ports. Thirty-two session can be defined on the module with each session being assigned to an application port. Within each session, up to five sectors can be defined. This system permits a very flexible assignment of resources in the module. The definition of the data associated with each sector in the system is defined in the configuration file by the user.

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