Siemens SINUMERIK 840D sl Function Manual page 236

Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.15 Examples
HT6 removal/insertion
Trouble-free removal and insertion of the HT 6 during machine operation requires the
following:
● Release or override of the HT 6 EMERGENCY STOP
● Connection of the HT 6 to the OPI/MPI via a PROFIBUS repeater.
Figure 2-48
A PROFIBUS repeater must be connected upstream of the HT 6 distributor box for each
branch. The individual bus segments (MPI/OPI cable and/or the local segments between
repeater and HT 6) must be terminated with connector resistors at the ends of the bus.
Repeater RS-485
The repeater can be ordered under Order No. 6ES7972-0AA01-0XA0. For further
information, please refer to the Catalog
/IK10/ Industrial Communication Networks SIMATIC-NET
Note
Please note:
• The HT 6 already has an installed bus terminating resistor.
• The cable length from the repeater to the distributor box must not exceed 2 m.
You can find suggested circuits for the emergency stop in:
References: /BH/ Operator Components Manual.
236
Connecting the HT 6 using a PROFIBUS repeater
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions