168 HEIDENHAIN Technical Manual MANUALplus 620
3.4 HSCI
3.4.1 Introduction
The main computer is connected to the controller units (CC or UxC) and the
PLB 6xxx PLC basic modules in the electrical cabinet via HSCI (HEIDENHAIN
Serial Controller Interface). The MB machine operating panel is also connected
via HSCI. The connection of the various control components via HSCI offers
numerous benefits, including:
Simple and uncomplicated wiring
High noise immunity
Comprehensive yet straightforward possibilities for diagnostics
The logic area of the control system is supplied with power via two separate
power loops:
The MC, MB, PLs and BF are supplied with power via the PSL 130 power
supply unit. The voltages of the PSL 130 correspond to the PELV system as
per EN 50178.
The logic voltages of the CC are voltages derived from the DC-link voltage
of the inverters, and are transmitted via connector X69 "NC supply voltages
and control signals." These voltages also correspond to PELV as per
EN 50178.
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