Siemens 7SG11 - Page 47

7SG11 Argus 8 Communication Interface
APPENDIX A - COMMUNICATION CONNECTIONS
Figures 1 to 6 illustrate a number of methods of connecting relays in communications networks.
(Note that in the case of the optical ring configuration (figure 5), the Data Echo feature must be switched ON in
the communications settings menu of the relay. In all other cases this setting should be set to OFF).
Personal Computer
Classical SCADA
EMS Remote
Control Points
Optical link
Parallel hardwired connections
(clean contacts, binary inputs)
1. Dialogue type comms (connection oriented)
2. Dialogue for purpose of analogue and digital fault
waveform extraction and display, setting display and change,
event display, instruments etc.
3. Manufacturer specific
SIGMA-4
Figure 1 - Basic Communications Configuration
Personal Computer
EMS Remote
Control Points
Optical link
Parallel hardwired connections
(clean contacts, binary inputs)
Personal Computer
Modem
Modem
PSTN : Public Switched Telephone Network
- Version of the former configuration of Figure 1. It is
necessary to make dial-up connection before actual
information exchange.
SIGMA-4
P
S
T
N
Modem
Classical SCADA
Figure 2 - Basic Communications Configuration (Remote)
©2011 Siemens Protection Devices Limited Chapter 4 Page 6 of 8