TOMATECH AUTOMATION
� To drive LED
A serial resistance is needed to limit the current (usually 10mA) that goes through the LED
by
using ULN2803 output to drive LED, which is shown in Fig. 2-30:
Fig. 2-30
� To drive filament indicator
An external preheat resistance is needed to decrease the current impact at power on by
using
ULN2803 output to drive filament indicator, and this resistance value should be within a
range that the
indicator cannot be lighted up as shown in Fig. 2-31:
CNC side Machine +24V
side
ULN2803
output
+24V
Machine
side
CNC side
Relay
ULN2803
output
Fig. 2-31 Fig.2-32
� To drive inductive load (such as relay)
To use ULN2803 output to drive an inductive load, it requires to connect a freewheeling
diode
near the coil to protect output circuit and reduce interference as shown in Fig. 2-32:
The significances of the output signal of I/O interface are defined by PLC program, these
signals
include S1～S4 (M41～M44), M3, M4, M5, M8, M10, M11, M32, TL-, TL+, U00～U05,
DOQPJ,
DOQPS, SPZD signals etc.. And their common terminal is +24V.
Chapter 2 Definition and Connection of Interface Signal
323
Ⅲ Connection
2.8 I/O Function and Connection
2.8.1 Stroke limit and emergency stop
� Relevant signal
ESP: emergency stop signal, alarm issued if the system is not connected with +24V
LMIX: X overtravel limit check input
LMIY: Y overtravel limit check input
LMIZ: Z overtravel limit check input
� Diagnosis data
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