Nck I/O Via Plc; General Functionality - Siemens SINUMERIK 840D sl Function Manual

Digital and analog NCK I/Os (A4)

1.2 NCK I/O via PLC

1.2 NCK I/O via PLC
1.2.1

General functionality

General
The ability to control or influence time-critical NC functions is dependent on high-speed NCK
I/O interfaces or the facility to rapidly address particular PLC I/Os.
Therefore, the functions below can be carried out using the SINUMERIK 840D/840Di:
● Use of digital and analog NCK inputs/outputs
● Direct addressing of particular PLC I/Os
The hardware inputs/outputs can be read and written via system variables in the part
program or synchronized actions.
Via the PLC interface, both the signal states of the digital I/Os and the values of the external
analog I/Os can be changed by the PLC user program according to the application.
840D hardware
On the SINUMERIK 840D on-board NCU there are four digital NCK inputs (inputs 1 to 4) and
four digital NCK outputs (outputs 1 to 4).
These four digital on-board inputs/outputs are stored in the first address byte. With the NCK
outputs, the remaining signals of this byte (NCK outputs 5 to 8) can be used via the PLC
interface (digital NCK outputs without hardware).
It is possible to connect further digital and analog NCK inputs/outputs (hereafter called
external NCK I/Os) using the "NCU terminal block", which can be coupled to the drive bus.
The "NCU terminal block" is used as a carrier module for up to eight DP compact plug-in
modules. Up to two "NCU terminal blocks" can be connected per NCU.
The maximum degree of expansion of the external NCK I/Os is:
● 32 digital NCK inputs (digital inputs 9 to 40)
● 32 digital NCK outputs (digital outputs 9 to 40)
● Eight analog NCK inputs (analog inputs 1 to 8)
● Eight analog NCK outputs (analog outputs 1 to 8)
For further information about the hardware specification see:
References:
/PHD/ SINUMERIK 840D Configuration Manual (HW)
26
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions