3-6
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01
Figure 3-2 shows the switches on the RS 485 repeater for activating the
terminating resistor.
Terminating resistor
bus segment 1
Terminating resistor
bus segment 2
DC
24 V
L+ M PE M 5.2
SIEMENS
ON
ON
Figure 3-2
Terminating Resistor on the RS 485 Repeater
Figure 3-3 shows a possible MPI configuration in which the terminating
resistor must be activated.
RS 485
repeater
➀
Terminating resistor activated
S7-300
S7-300
C7
Connecting
cable
S7-300
OP 25
OP 25
PG
PG*
*
Only connected during installation/maintenance via a tap line
À
À
À
À
Figure 3-3
Activating Terminating Resistors in an MPI Network
Terminating
Resistor on the RS
485 Repeater
Example of
Termination in an
MPI Network
Configuring an MPI Network
Содержание simatic c7-621
Страница 44: ...2 26 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 Installing and Preparing the C7 ...
Страница 64: ...3 20 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 Configuring an MPI Network ...
Страница 74: ...5 4 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 Attaching a C7 621 AS i ...
Страница 82: ...6 8 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 C7 621 Digital I Os ...
Страница 100: ...7 18 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 C7 621 Analog I Os ...
Страница 101: ...8 1 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 Maintenance 8 ...
Страница 110: ...A 8 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 General Technical Specifications ...
Страница 123: ...Glossary 1 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 Glossary ...
Страница 136: ...Index 4 C7 621 C7 621 AS i Control Systems C79000 G7076 C621 01 Index ...