Siemens M7-400 Benutzerhandbuch
RS 485 Repeater
10-3
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
A5E00069467-07
10.2
Appearance of the RS 485 Repeater;
(6ES7972-0AA01-0XA0)
The table below shows the appearance of the RS 485 repeater and lists its
functions.
functions.
Table 10-3 Description and Functions of the RS 485 Repeater
Repeater Design
No
.
Function
24 VDC
L+ M PE M 5.2
À
10
À
Connection for the RS 485 repeater power supply (pin “M5.2” is
the ground reference, if you want to measure the voltage
difference between terminals “A2” and “B2”).
the ground reference, if you want to measure the voltage
difference between terminals “A2” and “B2”).
À
Á
10
Á
Shield clamp for the strain relief and grounding of the bus cable
of bus segment 1 or bus segment 2
of bus segment 1 or bus segment 2
Â
Â
Terminals for the bus cable of bus segment 1
Â
A1
B1
A1
B1
Ã
Terminating resistance for bus segment 1
Ã
Ä
È
A1
B1
A1
B1
PG
OP
11
12
OFF
ON
DP1
Ä
Switch for OFF operating mode
(= isolate bus segments from each other – for example, for
startup
startup
Å
OP
DP2
12
Å
Terminating resistance for bus segment 2
SIEMENS
ON
Æ
Terminals for the bus cable of bus segment 2
SIEMENS
RS 485-REPEATER
Æ
A2
B2 A2
B2
Ç
Slide for mounting and removing the RS 485 repeater on the
standard rail
standard rail
Á
È
Interface for programming device/OP in bus segment 1
Á
10
LED 24 V supply voltage
Ç
11
LED for bus segment 1
12
LED for bus segment 2