RS 485 Repeater
10-3
S7-400, M7-400 Programmable Controllers Module Specifications
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.
Table 10-3 Description and Functions of the RS 485 Repeater
Repeater Design No
.Function
24 VDC L+ MPE M 5.2 À
10
ÀConnection 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”).
À
Á
10
ÁShield clamp for the strain relief and grounding of the bus cable
of bus segment 1 or bus segment 2
ÂÂTerminals for the bus cable of bus segment 1
Â
A1 B1 A1 B1 ÃTerminating resistance for bus segment 1
Ã
Ä
È
A1 B1 A1 B1
PG
OP
11
12
OFF
ON
DP1
ÄSwitch for OFF operating mode
(= isolate bus segments from each other – for example, for
startup
Å
OP DP2 12
ÅTerminating resistance for bus segment 2
SIEMENS
ON ÆTerminals for the bus cable of bus segment 2
SIEMENS
RS 485-REPEATER
Æ
A2 B2 A2 B2 ÇSlide for mounting and removing the RS 485 repeater on the
standard rail
Á
ÈInterface for programming device/OP in bus segment 1
Á
10 LED 24 V supply voltage
Ç11 LED for bus segment 1
12 LED for bus segment 2