Siemens SPC3 Dokumentacja Strona 59

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DPC31 HW
SchnittStellenCenter
DPC31 HW Description
Version V1.0 Page 57
Copyright (C) Siemens AG 2000. All rights reserved. 12/00
Applikations-
Elektronik
IEC-MAU
Bus
TxS
TxE
RxS
(RxA)
TxS
TxE
RxS
RxA
GIM=L
a) Ohne galvanische Trennung
0V
b) Herkömmliche Trennung mit Optokopplern
Applikations-
Elektronik
IEC-MAU
Bus
TxS_IM
TxE
RxS_IM
(RxA)
TxS
TxE
RxS
RxA
GIM=H
GND
0V
Komparator
Applikations-
Elektronik
IEC-MAU
Bus
TxS
TxE
RxS
(RxA)
TxS
TxE
RxS
(RxA)
GIM=L
GND
c) Stromsparende Trennung mit Optokopplern
A
B
A
B
A
B
TxSD
TxSD
TxSD
DPC31
Modulator
Syn.
Physik
TxS
RTS/ADD
GIM_EN='0
'
Demodulator
GIM_EN='0'
GIM_EN='0'
TxS1
TxE1
TxSD
RxS1
RxA1
RxSD
XCTS
RxS
DPC31
Modulator
Syn.
Physik
TxS
RTS/ADD
GIM_EN='0'
Demodulator
GIM_EN='0'
GIM_EN='0'
TxS1
TxE1
TxSD
RxS1
RxA1
RxSD
XCTS
RxS
DPC31
Modulator
Syn.
Physik
TxS
RTS/ADD
GIM_EN='1'
Demodulator
GIM_EN='1'
GIM_EN='1''
TxS1
TxE1
TxSD
RxS1
RxA1
RxSD
XCTS
RxS
Figure 7.5-7:
Interface to the Communication Controller DPC31
The interface logic of the power-saving serial interface includes a pulse modulator and a pulse demodulator
as in the SIM1 (Figure 7.5-7c). The comparator for regeneration of the analog receive signal behind the
optocoupler is not integrated into the DPC31 but must be set up externally.
Pulse Duration Modulator
:
In the galvanic isolation mode (GIM_EN=’1’), the PDM (Figure 7.5-8) converts the serial signal that is to be
transmitted into a duration-modulated pulse sequence; the rising edge of the send
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