Analog Outputs - Siemens SINUMERIK 840D sl Function Manual

A4: Digital and analog NC I/O for SINUMERIK 840D sl
2.2 Indirect I/O access via PLC
Analog NC input without hardware
The following value is read in the case of part program access to analog NC inputs that are
defined via MD10300, but are not available as hardware inputs:
● The setpoint specified from the PLC (if the IS "Analog value input for NC from the PLC" is
set to "1")
● 0 volts (if the IS "Analog value input for NC from the PLC" is not set)
This makes it possible to use the functionality of the analog NC inputs from the PLC user
program without I/O hardware.
2.2.6.2

Analog outputs

Function
Analog values to be output very quickly via the analog NC outputs, bypassing the PLC cycle
times.
The value of the analog output <n> can be defined directly in the part program using system
variable $A_OUTA[<n>].
Before output to the hardware I/Os, the analog value set by the NC can be changed by the
PLC.
Application
The analog NC outputs are used in particular for grinding and laser machines.
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions