January 2012 2.4 General Information 83
2.4.1 HSCI interface
The individual control components communicate with each other via the HSCI
connection (HEIDENHAIN Serial Controller Interface). A connection via HSCI
is only permitted for HEIDENHAIN components that are part of the machine
tool's control system. In addition, the HSCI connecting cable may only be
installed in a protected manner (e.g. within the electrical cabinet, cable ducts).
The following features characterize the HSCI connection:
Based on standard 100BaseT Ethernet hardware
Telegrams of the HSCI connection are not compatible with the Ethernet
Line structure
Only one master in the system (MC), all other devices are HSCI slaves
Different addresses are assigned to the individual participants in the HSCI
network. The addresses are assigned dynamically during booting of the MC.
The HSCI addresses of the participants are formed from an HSCI address
(8 bits) and a device type address (6 bits).
After the machine has undergone acceptance testing, the nominal
configuration of the control is saved in the IOC file on the control's memory
card. This nominal configuration contains the assignment of the device-type
address and serial number of the device to the individual HSCI addresses. The
momentary configuration is ascertained during startup of the system by
requesting the serial numbers. The momentary configuration is compared
with the nominal configuration. If there is a deviation, the machine operator is
prompted to check the configuration.
The following applies to the assignment of the HSCI address:
The HSCI address (bus address) is the result of the device's position in the
bus
The master (MC) always has the HSCI address 0.
The HSCI addresses of the slaves result from their position in the bus:
• First device after the master (MC): Bus address 1
• Second device after the master (MC): Bus address 2
•etc.
The device-type address is for internally distinguishing between connected
HSCI participants. Each device type (MC, CC, PL, MB, etc.) is assigned a type
specification that is used to address all HSCI participants of this type.
More information on the connection of the HSCI components is provided
under “HSCI" on page 168.
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