Siemens SIMATIC NET PROFIBUS User Manual

Active Components for RS-485 Networks
5-3
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Table 5-1 Description and Functions of the RS-485 Repeater
Layout of the Repeater
No. Function
DC
24 V
L+ M PE M 5.2
À
10
À Terminal for connecting the power supply of the RS 485
repeater (pin “M5.2” is the reference ground if you want to
measure the voltage between terminals “A2” and “B2”).
24 V
À
Á
10
Á Shield clamp for strain relief and grounding the LAN cable of
bus segment 1 or bus segment 2
Â
 Terminal for the LAN cable of bus segment 1
Â
A1 B1 A1 B1
à Terminating resistor for bus segment 1 )
1
Ã
Ä
È
A1 B1 A1 B1
PG
11
OFF
ON
DP1
Ä Switch for OFF state
(= Disconnect bus segments 1 and 2, for example, during
commissioning)
Å
OP
DP2
12
Å Terminating resistor for bus segment 2 )
1
SIEMENS
ON
Æ Terminal for the LAN cable of bus segment 2
SIEMENS
RS 485-REPEATER
Æ
A2 B2 A2 B2
Ç Catch for mounting and removing the RS-485 repeater on a
standard rail
Á
È Interface for PG/OP on bus segment 1
Á
10
LED 24 V power supply
Ç
11
LED indicating bus activity on segment 1
12
LED indicating bus activity on segment 2
)
1
If the terminating resistor is activated, the right-hand bus attachment is disconnected (see
Figure 5-3) !
Note
Terminal M5.2 of the power supply (see Table 5-1, no. À) is used as the reference
ground for signal measurements if problems occur and must not be wired up.

Siemens SIMATIC NET PROFIBUS Specifications

General

Brand	Siemens
Model	SIMATIC NET PROFIBUS
Category	Network Hardware
Language	English