170 HEIDENHAIN Technical Manual MANUALplus 620
3.4.2 Topology
The HSCI slaves are connected—in series—to connector X500 of the main
computer. Connector X502 is always the HSCI input to the HSCI slaves and
X500 the HSCI output to the next HSCI slave.
The nonsynchronized second HSCI output X501 of the MC 6xxx can be used
to connect a machine operating panel or a PLB 6001. However, do not con-
nect any devices other than a machine operating panel or a PLB 6001 to X501
(no other or further HSCI components).
The HSCI components are connected via special shielded HSCI cables
adapted for the increased demands of machine tool environments.
Terminating resistors are not required in the HSCI system.
The HSCI network is to be structured as an "open" ring (line structure). Con-
nector X500 on the main computer is the beginning of the HSCI network. The
HSCI connection is then led to X502 of the next HSCI participant (CC, UxC, PL
or MB), where X500 again serves as the output for continuing the HSCI net-
work to the next participant (X502). The last HSCI participant in the ring
detects its position automatically (X500 remains open) and internally and inde-
pendently closes the ring of the HSCI network.
A star configuration of the HSCI network (e.g. by using a hub) is not possi-
ble.
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