HEIDENHAIN TNC 306 Technical Manual - Manual (Page 34)

3/99
TNC 416/TNC 406/TNC 306 Power supply 3–19
4.1.2 PLC power supply
Power supply for the PLC on board
LE 416/LE 406 X44
LE 306 X24
Pin number Assignment
1 + 24 V DC, switched off by EMERGENCY STOP
2 + 24 V DC, not switched off by EMERGENCY STOP
3 0 V
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 +24 V power for outputs O40 to O47
X13 +24 V power for outputs O48 to O55
X14 +24 V power for outputs O56 to O62
The PLC inputs and outputs on the LE and PL 410 B are powered by the 24 V machine control voltage
supply.
Danger to internal components!
Voltage sources for external circuitry must conform to the recommendations in VDE
0160, 5. 88 for low-voltage electrical separation.
Superimposed AC components, such as those caused by a three-phase bridge rectifier without smoothing,
are permissible up to a ripple factor of 5% (see DIN 40110/10.75, Section 1.2). This means an absolute
upper voltage limit of 32.6 V and an absolute lower voltage limit of 18.5 V:
32.6 V
31 V
20.4 V
18.5 V
U
t
The 0 V line of the PLC power supply must be grounded with a ground lead (ø 6 mm2) to the main
signal ground of the machine.