Siemens SINUMERIK 840D sl Manual page 22

Application Planning
3.1 Secondary electrical conditions
Shielded signal lines
● For the safe and smooth operation of the system, the specified cables must be used.
● For digital signal transmission, the shielding must always be connected to the housings at
Cable definitions
● Signal cables (example)
● Load cables (example)
Rules for routing cables
In order to maximize noise immunity for the complete system (controller, power section,
machine) the following EMC measures must be observed:
● The distance between signal lines and load cables must be maximized.
● If necessary, signal and load cables may cross one another (if possible, at an angle of
● Only use cables approved by SIEMENS for the signal lines from and to the Control Unit.
● Signal cables may not be routed close to strong external magnetic fields (e.g., motors
● Pulse-loaded HC/HV lines must always be laid completely separately from all other lines.
22
Please refer to the chapter titled Connection.
both ends.
Exception:
If non-Siemens devices are connected (printers, programming devices, etc.), standard
shielded cables grounded at one end can also be used. However, these devices must not
be connected to the controller during normal operation. However, if the system cannot
operate without them, then the cable shields must be connected at both ends.
Furthermore, the non-Siemens device must be connected to the controller via an
equipotential bonding cable.
– Data cables (Ethernet, PROFIBUS, sensor cables, etc.)
– Digital inputs/outputs
– EMERGENCY OFF lines
– Low-voltage supply lines (230 VAC, 24 VDC, etc.)
– Supply cables to contactors (primary and secondary circuit)
90°), but must never be laid close or parallel to one another.
and transformers).
Manual, 03/2010, 6FC5397-0AP10-3BA0
NCU