HEIDENHAIN TNC 335 Technical Manual - Manual (Page 45)

3-16
TNC 360 4 Power Supply 8/95
X24 power supply for the PLC at the LE
Pin Number Assignment
1 + 24 Vdc switched off by EMERGENCY STOP
2 + 24 Vdc not switched off by EMERGENCY STOP
3 0 V
Danger to internal components!
Use only original replacement fuses.
Power supply for the PL 410 B
The PLC outputs are powered in groups.
Terminal Assignment PLC output
X9 0V
X10 +24 V power for logic and for "Control is operational"
X11 +24 V power for outputs O32 to O39
X12 O40 to O47
X13 O48 to O55
X14 O56 to O62
Power supply for the PL 410
Connections as with PL 410 B.
Terminal Assignment
X13 +24 Vdc switched off by EMERGENCY STOP
X12 0 V
X3 Pin 12 + 24 Vdc not switched off by EMERGENCY STOP
4.1.3 Buffer battery
The buffer battery is the potential source for the RAM memory for NC programs, PLC programs
and machine parameters when the control is switched off.
If the ”EXCHANGE BUFFER BATTERY” message appears, the batteries must be exchanged.
The 3 batteries may be found behind a screw cap in the power supply section of the logic unit.
As well as the batteries, the logic unit contains an additional energy store, mounted on the
processor board, for buffering the memory contents.
This means that the mains can be switched off when replacing the batteries. The energy
store will ensure that the memory is retained while the batteries are exchanged.