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Technical description
Digital control design
Uniformly digital
In the HEIDENHAIN uniformly digital control solution, all
components are connected over purely digital interfaces: the
control components over HSCI (HEIDENHAIN Serial Controller
Interface), the new HEIDENHAINreal-time protocol for Fast
Ethernet and the encoders over EnDat 2.2, the bidirectional
interface from HEIDENHAIN. This achieves a high degree of
availability for the entire system. It can be diagnosed and is
immune to noise—from the main computer to the encoder. The
outstanding characteristics of the uniform digital solution from
HEIDENHAIN guarantee very high accuracy and surface definition
together with high traversing speeds. Please refer to the Uniformly
Digital Technical Information sheet for more detailed information.
HSCI
HSCI, the HEIDENHAIN Serial Controller Interface, connects the
main computer, controller(s) and other control components. The
connection between two HSCI components is also referred to as
an HSCI segment. HSCI is based on 100BaseT Ethernet hardware.
A special interface component developed by HEIDENHAIN makes
short cycle times for data transfer possible.
Main advantages of the control design with HSCI:
•
Hardware platform for a flexible and scalable control system (e.g.
decentralized axis systems
•
High noise immunity due to digital communication between
components
•
Hardware basis for implementing “functional safety”
•
Simple wiring (commissioning, configuration)
•
Inverters connected via proven PWM interface
•
Large cable lengths in the entire system (HSCI segment up to
max. 70 m)
•
High number of possible control loops
•
High number of PLC inputs/outputs
•
Controller units can be installed elsewhere
CC or UEC controller units, up to nine PL 6000 input/output
modules, and an MB machine operating panel (e.g. MB 720 from
HEIDENHAIN) can be connected to the serial HSCI bus of the MC
main computer. The HR handwheel is connected directly to the
machine operating panel. The combination of visual display unit
and main computer is especially advantageous if the computer
is housed in the operating panel. All that is required then is the
power supply and an HSCI line to the controller in the electrical
cabinet.
Maximum cable length for HSCI:
•
For one HSCI segment: 70 m
•
For up to 12 HSCI slaves: 290 m (total of HSCI segments)
•
For up to 13 HSCI slaves (maximum configuration): 180 m (total of
HSCI segments)
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