Siemens Sinumerik 802D sl Instruction Manual page 29

Danger
!
The 24 V power supply is to be designed as functional extra-low voltage with protective
separation in accordance with EN60204-1, Section 6.4, PELV (with M ground).
Digital inputs (PCU)
These fast inputs correspond to Standard IEC 1131-2/DIN EN 61131-2, characteristic curve
type 2 (24 V-P-switching). Switches or proximity encoders (2 or 3-wire encoders) can be
connected.
Digital outputs (PCU)
These fast outputs (onboard) correspond to Standard IEC 1131-2/DIN EN 61131-2
(24 V-P-switching).
Siemens Automation Parts
SINUMERIK 802D sl Instruction Manual (BA), 05/2005 Edition
6FC5 397-0CP10-1BA0
4.1 CNC operator panel (PCU) interfaces
Interfaces
4-27