sepam 20 user manual - Schneider Electric

7
PE80116
PE80117
Use SFT2841 setting and operating
software
Configuration of a Sepam network
Configuration window for the serial link communication
network.
Configuration window for the Ethernet TCP/IP communication
network.
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Direct serial link
The Sepam units are connected to an RS 485 (or fiber-optic) multidrop network.
Depending on the serial link interfaces available on the PC, the PC itself will be
connected either directly to the RS 485 network (or fiber-optic HUB), or via an
RS 232/RS 485 converter (or fiber-optic converter).
The communication parameters to be defined are:
b port: communication port used on the PC
b speed: 4800, 9600, 19200 or 38400 bauds
b parity: None, Even or Odd
b handshake: none, RTS or RTS-CTS
b time-out: from 100 to 3000 ms
b number of retries: from 1 to 3.
Link via Ethernet TCP/IP
The Sepam units are connected to an RS 485 multidrop network over one or more
Ethernet Modbus TCP/IP gateways (for example: EGX gateways or ECI850 servers
that act as the Modbus TCP/IP gateway for the link with the SFT2841).
Use on an IEC 61850 network
SFT2841 can be used on an IEC 61850 network. In this case, it can be used to define
the IEC 61850 configuration of Sepams connected to this network. See the Sepam
IEC 61850 Communication user's manual (reference SEPED306024EN) for more
information.
Configuration of the Modbus TCP/IP gateway
See the setup manual for the gateway used.
In general, the gateway should be assigned an IP address.
The configuration parameters for the gateway’s RS 485 interface must be defined in
accordance with the Sepam communication interface configuration:
b speed: 4800, 9600, 19200 or 38400 bauds
b character format: 8 data bits + 1 stop bit + parity (none, even, odd).
Configuration of communication on SFT2841
When configuring a Sepam network on SFT2841, the following communication
parameters must be defined:
b Type of device: Modbus gateway, ECI850 or Sepam
b IP address: IP address for the connected remote equipment
b time-out: from 100 to 3000 ms.
A time-out of between 800 ms and 1000 ms is sufficient in most installations.
Communication via the TCP/IP gateway may, however, be slowed down if other
applications want Modbus TCP/IP or IEC 61850 access at the same time.
The time-out value should then be increased (2 to 3 seconds).
b number of retries: from 1 to 3.
Note 1: SFT2841 uses the Modbus TCP/IP communication protocol.
Although communication is IP-based, use of SFT2841 is restricted to a local installation network
based on an Ethernet network (LAN – Local Area Network).
The operation of SFT2841 over a WAN (Wide Area Network) cannot be guaranteed because of
the presence of some routers or firewalls that may reject the Modbus protocol, causing
communication times that would be incompatible with Sepam.
Note 2: SFT2841 allows Sepam protection settings to be modified, and direct activation of the
outputs. These operations, which could involve the operation of electrical equipment (opening
and closing), and thus put the safety of people and installations at risk, are protected by the
Sepam password. In addition to this protection, the E-LANs and S-LANs must be designed as
private networks, protected from external actions by all suitable methods.
PCRED301005EN - 06/2008