RS 485 Repeater
7-3
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
7.2 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 7-3 Description and Functions of the RS 485 Repeater
Repeater Design
No. Function
24 VDC
L+ M PE M 5.2
10
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”).
Shield clamp for the strain relief and grounding of the bus cable
of bus segment 1 or bus segment 2
Terminals for the bus cable of bus segment 1
A1 B1 A1 B1
Terminating resistance for bus segment 1
PG
11
OFF
ON
DP1
Switch for OFF operating mode
(= isolate bus segments from each other – for example, for
startup
DP2
12
Terminating resistance for bus segment 2
ON
Terminals for the bus cable of bus segment 2
RS 485-REPEATER
A2 B2 A2 B2
Slide for mounting and removing the RS 485 repeater on the
standard rail
Interface for programming device/OP in bus segment 1
10
LED 24 V supply voltage
11
LED for bus segment 1
12
LED for bus segment 2
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