2 wiring with a host (master), Wiring with a host (master), Installation – Lenze EMF2133IB User Manual
Page 24: Danger
Installation
Electrical installation
Wiring with a host (master)
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24
EDSMF2133IB EN 5.0
5.2.2
Wiring with a host (master)
{
Danger!
You have to provide additional electrical isolation if ...
ƒ
an 820X and 821X controller is connected to the host and
ƒ
a safe electrical isolation (reinforced insulation) according to EN 61800−5−1
is required.
Basic wiring of the PROFIBUS
The connection of the PROFIBUS bus system is shown in the general layout drawing.
3
3
3
1
2
2
2
0 m
1200 m
GG + 2133
GG + 2133
GG + 2133
E82ZAFP005
Fig. 5−2
Example: PROFIBUS with RS485 wiring (without repeater)
No.
Element
Comment
1
Host
e.g. PC or PLC with PROFIBUS master interface module
2
Bus cable
Connects the PROFIBUS master interface module to the communication
modules.
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The baud rate depends on the bus cable length (
^ 26).
3
PROFIBUS slave
Applicable standard device (GG,
^ 12) with communication module
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Activate the bus terminating resistors on the first and last physical bus
device (
^ 24).
)
Note!
When using a repeater, max. 125 devices can communicate via the PROFIBUS.
Bus terminating resistor
The PROFIBUS must be terminated by a bus terminating resistor at the physically first and
last station.
The bus terminating resistor is in the bus connector (
¶ 128)and is activated using a
switch.
)
Note!
ƒ
If you want to disconnect individual bus devices, ensure that the bus
terminators at the cable ends remain active.
ƒ
Please note that the bus termination is no longer active if ...
– the connector has been disconnected e.g. in service case;
– the voltage supply of the communication module has been switched off.