Siemens SINUMERIK 840Di Manual page 68

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Table of Contents

2 Hardware Descriptions

2.4 MCI board extension slot variation (SW 11.00 and higher)

Digital inputs

Digital outputs

Sensor probes

Please note the following points about the digital inputs:

– Isolated from the board electronics

– Connected to the same ground (GNDEXT)

Please note the following points about the digital outputs:

– Isolated from the board electronics

– Connected to the same ground (GND24EXT), as is their the external

24V power supply

The handwheels are not isolated from the board electronics.

In the case of differential handwheels, the following signals are used:

In the case of TTL handwheels, the following signals are used:

The optional power supply of the handwheels (P5) is electronically protected

with 2A. The maximum continuous load is 1A. Per handwheel 500mA.

Please note the following points about sensor probes:

– The sensor probes are isolated among themselves and from all other

potential areas (board electronics, dig. inputs, dig. outputs, and

handwheels).

The sensor probes are isolated among themselves and from the board electron-

SINUMERIK 840Di Manual (HBI) – 06.03 Edition