Absolute Value Encoders; Serial Interfaces - Siemens SIMADYN D Hardware Manual

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7.2.4 Absolute value encoders

7.2.5 Serial interfaces

„Service"
interface 1
Interface 2
Hardware - SIMADYN D
Edition 03.2001
HongKong|UK|China
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The T400 has up to 2 synchronous-serial interfaces for multi-turn absolute
value encoders:
• SSI- and EnDat protocol (according to the Heidenhain company)
• Selectable cycle between 100 kHz and 2 MHz
• Either dual- or Gray-, or Gray-excess code can be selected
However, terminals 72 - 75 can only be alternatively used as
− second synchronous-serial interface ("absolute value encoder 2") or
− peer-to-peer or USS protocol
It is possible to simultaneously use, for example, peer-to-peer and "absolute
value encoder 1" (terminals 76-79).
T400 has 2 serial interfaces:
The following is realized via interface 1,
• the program is downloaded
• service („CFC in the test mode", "basic service") for start-up
(DUST1 protocol).
Baud rate: 19.2 kbaud
Optionally, the USS protocol (master/slave), to connect a MASTER
DRIVES OP1S operator control unit or SIMOVIS can be set per hardware
switch on the T400.
Interface 1 has both physical interfaces (can be optionally used!):
• RS 232
for PC coupling (download, service)
• RS 485 (2 wire)
e.g. for USS to the operator control panel
connection (OPx, SIMOVIS) or to higher-level
(master) systems (SIMATIC); incl. terminating
resistors which can be switched-in
Interface 2 is a mix asynchronous and synchronous interface with RS 485
data transfer signal level:
• Peer-to-peer
with full duplex, 4-wire connection
• USS protocol (master/slave)
with half-duplex, 2-wire connection
The following baud rates can be set:
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