Siemens SIMATIC S7-300 Module data Reference Manual

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”).


10
 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



A1 B1 A1 B1
PG
OP
11
12
OFF
ON
DP1
 Switch for OFF operating mode
(= isolate bus segments from each other – for example, for
startup

OP
DP2
12
OFF
 Terminating resistance for bus segment 2
SIEMENS
ON
 Terminals for the bus cable of bus segment 2
SIEMENS
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

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)