A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.1 Introduction
Extended Functions
26 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Table 1- 1 Maximum number of digital and analog NCK I/Os
Total NCU on-board External NCK I/Os
Digital inputs 36 4 32
Digital outputs 36 4 32
Analog inputs 8 - 8
Analog outputs 8 - 8
References:
For further information about the hardware specification, refer to:
● SINUMERIK 840D sl NCU Manual
● SIMATIC ET 200S FC Operating Instructions
Access to NCK I/Os:
The fast digital and analog NCK I/Os can be accessed in the following ways:
● Access via PLC (Page 27) (for on-board I/Os and PROFIBUS I/Os)
● Access via PROFIBUS (Page 54) (for PROFIBUS I/Os)
Monitoring
The following monitoring functions are active for the external NCK I/Os:
● During run-up:
– Check whether the arrangement of components of the I/O modules in the ET 200
modules matches the MD assignments.
● During cyclic operation:
– Sign-of-life monitoring in interpolation cycles
– Module monitoring in interpolation cycles
– Temperature monitoring
In the event of a fault, NC-Ready is canceled and an alarm is output.
Response to faults
The digital and analog NCK outputs are switched to a safe status (0 V at output) in the event
of faults (e.g. NC-Ready = 0) in the NCU or power failures.
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