01.04 Function descriptions
SIEMENS AG 6SG7000-0BA76 9-21
SIMOTRAS HD Operating Instructions
9.9 Serial interfaces
The SIMOTRAS 6SG70 converter is equipped with the following serial interfaces:
−
G-SST1 (serial interface 1)
Connector X300 on board A7005 (operator panel)
USS
®
protocol
provided for the purpose of connection the OP1S operator panel
−
G-SST2 (serial interface 2)
Terminal strip X172 (terminals 56 to 60) on board A7001
USS
®
and peer-to-peer protocol, parameterizable
Additionally if board A7006 (terminal expansion) is installed:
−
G-SST3 (serial interface 3)
Terminal strip X162 (terminals 61 to 65)
USS
®
and peer-to-peer protocol, parameterizable
Interface hardware
The hardware of G-SST1 is designed to operate in RS232 and RS485 standard / two-wire mode, and
G-SST2 and G-SST3 in RS485 standard / two and four-wire mode. For connectors and terminal
assignments, see Section 8, Sheets G170 to G174.
The maximum cable length for a peer-to-peer connection from the transmitter to the last receiver
connected to the same transmission output is 1000 m. The same maximum cable length applies to the
bus cable of a USS connection. The maximum cable length is only 500 m for both types of connection
if a baud rate of 187500 bd is selected.
USS:
A maximum of 32 nodes can be connected in the bus configuration (i.e. 1 master and max. 31 slaves).
The bus connector must be activated on the two bus nodes which form each end of the bus circuit.
Peer-to-peer:
Up to 31 other drives can be connected in parallel to the transmit cable of one drive. With a "parallel
connection", the bus connector must be activated on the last connected drive.
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