Interface Module Ss1 - Siemens SIMADYN D Hardware Manual

Aotewell Ltd
6.5

Interface module SS1

Order No.
Description
Features
Recommended
connection
Hardware - SIMADYN D
Edition 12.2004
HongKong|UK|China
www.aotewell.com
6DD1688-1AA0
The SS4 communications module with SS1 interface module can be
equipped with a 20 mA line current interface.
The SS1 has, for the receiver and for the transmitter, a current source and
current drain, so that coupling partners without current sink can be
connected.
The interface module is a 40-pin (dual-in-line) hybrid circuit which is used in
the socket provided on the SS4 communications module.
When inserting the module, ensure that it is correctly aligned: The recesses
of the socket of the interface module (or pin 1, marked with a point) and the
socket on the SS4 (X51) must coincide.
• electrical isolation via optocoupler
• independent transmit- and receive channels
• 2 current sources
• 2 current sinks
• data transfer rate up to 38.4 kbaud
• max. cable length: 1000 m
In order to achieve data transfer with the highest possible noise immunity,
even at high baud rates and long cable lengths, we recommend that the
cables are connected, so that the current source (+Iq) and transmitter (+/-
TxD) are located at the same cable end.
In this case, the cable capacitance must only be charged with the diode
voltage (receiver). If the transmitter (transmit transistor) is located as current
source at the other cable end, the cable capacitance must be charged with
approximately the supply voltage.
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